Merge mulgrave.(none):/home/jejb/BK/scsi-host-list-2.5

into mulgrave.(none):/home/jejb/BK/scsi-for-linus-2.5

drivers/acorn/scsi/acornscsi.c

@@ -3010,14 +3010,12 @@ int acornscsi_proc_info(char *buffer, char **start, off_t offset,
 			int length, int host_no, int inout)
 {
     int pos, begin = 0, devidx;
-    struct Scsi_Host *instance = scsi_hostlist;
+    struct Scsi_Host *instance;
     Scsi_Device *scd;
     AS_Host *host;
     char *p = buffer;
 
-    for (instance = scsi_hostlist;
-	    instance && instance->host_no != host_no;
-		instance = instance->next);
+    instance = scsi_host_hn_get(host_no);
 
     if (inout == 1 || !instance)
 	return -EINVAL;

drivers/acorn/scsi/arxescsi.c

@@ -384,15 +384,11 @@ int arxescsi_proc_info(char *buffer, char **start, off_t offset,
 			    int length, int host_no, int inout)
 {
 	int pos, begin;
-	struct Scsi_Host *host = scsi_hostlist;
+	struct Scsi_Host *host;
 	ARXEScsi_Info *info;
 	Scsi_Device *scd;
 
-	while (host) {
-		if (host->host_no == host_no)
-			break;
-		host = host->next;
-	}
+	host = scsi_host_hn_get(host_no);
 	if (!host)
 		return 0;
 

drivers/acorn/scsi/cumana_2.c

@@ -498,15 +498,11 @@ int cumanascsi_2_proc_info (char *buffer, char **start, off_t offset,
 			    int length, int host_no, int inout)
 {
 	int pos, begin;
-	struct Scsi_Host *host = scsi_hostlist;
+	struct Scsi_Host *host;
 	CumanaScsi2_Info *info;
 	Scsi_Device *scd;
 
-	while (host) {
-		if (host->host_no == host_no)
-			break;
-		host = host->next;
-	}
+	host = scsi_host_hn_get(host_no);
 	if (!host)
 		return 0;
 

drivers/acorn/scsi/eesox.c

@@ -499,15 +499,11 @@ int eesoxscsi_proc_info(char *buffer, char **start, off_t offset,
 			    int length, int host_no, int inout)
 {
 	int pos, begin;
-	struct Scsi_Host *host = scsi_hostlist;
+	struct Scsi_Host *host;
 	EESOXScsi_Info *info;
 	Scsi_Device *scd;
 
-	while (host) {
-		if (host->host_no == host_no)
-			break;
-		host = host->next;
-	}
+	host = scsi_host_hn_get(host_no);
 	if (!host)
 		return 0;
 

drivers/acorn/scsi/powertec.c

@@ -404,15 +404,11 @@ int powertecscsi_proc_info(char *buffer, char **start, off_t offset,
 			    int length, int host_no, int inout)
 {
 	int pos, begin;
-	struct Scsi_Host *host = scsi_hostlist;
+	struct Scsi_Host *host;
 	PowerTecScsi_Info *info;
 	Scsi_Device *scd;
 
-	while (host) {
-		if (host->host_no == host_no)
-			break;
-		host = host->next;
-	}
+	host = scsi_host_hn_get(host_no);
 	if (!host)
 		return 0;
 

drivers/block/cciss_scsi.c

@@ -1250,8 +1250,6 @@ cciss_scsi_user_command(int ctlr, int hostno, char *buffer, int length)
 	return length;
 }
 
-/* It's a pity that we need this, but, we do... */
-extern struct Scsi_Host *scsi_hostlist;  /* from ../scsi/hosts.c */
 
 int
 cciss_scsi_proc_info(char *buffer, /* data buffer */
@@ -1268,24 +1266,9 @@ cciss_scsi_proc_info(char *buffer, /* data buffer */
 	ctlr_info_t *ci;
 	int cntl_num;
 
-	/* Lets see if we can find our Scsi_Host... 
-	   this might be kind of "bad", searching scis_hostlist this way
-	   but how else can we find the scsi host?  I think I've seen
-	   this coded both ways, (circular list and null terminated list)
-	   I coded it to work either way, since I wasn't sure.  */
-
-	sh = scsi_hostlist;
-	found=0;
-	do {
-		if (sh == NULL) break;
-		if (sh->host_no == hostnum) {
-			found++;
-			break;
-		}
-		sh = sh->next;
-	} while (sh != scsi_hostlist && sh != NULL);
 
-	if (sh == NULL || found == 0) /* This really shouldn't ever happen. */
+	sh = scsi_host_hn_get(hostnum);
+	if (sh == NULL) /* This really shouldn't ever happen. */
 		return -EINVAL;
 
 	ci = (ctlr_info_t *) sh->hostdata[0];

drivers/scsi/53c700.c

@@ -1723,13 +1723,11 @@ NCR_700_proc_directory_info(char *proc_buf, char **startp,
 {
 	static char buf[4096];	/* 1 page should be sufficient */
 	int len = 0;
-	struct Scsi_Host *host = scsi_hostlist;
+	struct Scsi_Host *host;
 	struct NCR_700_Host_Parameters *hostdata;
 	Scsi_Device *SDp;
 
-	while(host != NULL && host->host_no != host_no)
-		host = host->next;
-
+	host = scsi_host_hn_get(host_no);
 	if(host == NULL)
 		return 0;
 

drivers/scsi/aic7xxx/aic7xxx_linux_host.h

@@ -63,7 +63,6 @@ int		 ahc_linux_abort(Scsi_Cmnd *);
  * to do with card config are filled in after the card is detected.
  */
 #define AIC7XXX	{						\
-	next: NULL,						\
 	module: NULL,						\
 	proc_dir: NULL,						\
 	proc_info: ahc_linux_proc_info,				\

drivers/scsi/cpqfcTSinit.c

@@ -938,9 +938,7 @@ int cpqfcTS_proc_info (char *buffer, char **start, off_t offset, int length,
   char buf[81];
 
   // Search the Scsi host list for our controller
-  for (host=scsi_hostlist; host; host=host->next)
-    if (host->host_no == hostno)
-      break;
+  host = scsi_host_hn_get(hostno);
 
   if (!host) return -ESRCH;
 

drivers/scsi/fcal.c

@@ -213,9 +213,7 @@ int fcal_proc_info (char *buffer, char **start, off_t offset, int length, int ho
 	char *pos = buffer;
 	int i, j;
 
-	for (host=scsi_hostlist; host; host=host->next)
-		if (host->host_no == hostno)
-                      break;
+	host = scsi_host_hn_get(hostno);
 
 	if (!host) return -ESRCH;
 

drivers/scsi/hosts.c

@@ -15,12 +15,15 @@
  *  Updated to reflect the new initialization scheme for the higher 
  *  level of scsi drivers (sd/sr/st)
  *  September 17, 2000 Torben Mathiasen <tmm@image.dk>
+ *
+ *  Restructured scsi_host lists and associated functions.
+ *  September 04, 2002 Mike Anderson (andmike@us.ibm.com)
  */
 
 
 /*
  *  This file contains the medium level SCSI
- *  host interface initialization, as well as the scsi_hosts array of SCSI
+ *  host interface initialization, as well as the scsi_hosts list of SCSI
  *  hosts currently present in the system.
  */
 
@@ -31,232 +34,711 @@
 #include <linux/mm.h>
 #include <linux/proc_fs.h>
 #include <linux/init.h>
+#include <linux/list.h>
+#include <linux/smp_lock.h>
 
 #define __KERNEL_SYSCALLS__
 
 #include <linux/unistd.h>
+#include <asm/dma.h>
 
 #include "scsi.h"
 #include "hosts.h"
 
-/*
-static const char RCSid[] = "$Header: /vger/u4/cvs/linux/drivers/scsi/hosts.c,v 1.20 1996/12/12 19:18:32 davem Exp $";
-*/
+LIST_HEAD(scsi_host_tmpl_list);
+LIST_HEAD(scsi_host_hn_list);
 
-/*
- *  The scsi host entries should be in the order you wish the
- *  cards to be detected.  A driver may appear more than once IFF
- *  it can deal with being detected (and therefore initialized)
- *  with more than one simultaneous host number, can handle being
- *  reentrant, etc.
+LIST_HEAD(scsi_host_list);
+spinlock_t scsi_host_list_lock = SPIN_LOCK_UNLOCKED;
+
+struct Scsi_Device_Template * scsi_devicelist;
+
+static int scsi_host_next_hn;		/* host_no for next new host */
+static int scsi_hosts_registered;	/* cnt of registered scsi hosts */
+
+/**
+ * scsi_tp_for_each_host - call function for each scsi host off a template
+ * @shost_tp:	a pointer to a scsi host template
+ * @callback:	a pointer to callback function
  *
- *  They may appear in any order, as each SCSI host is told which host 
- *  number it is during detection.
- */
+ * Return value:
+ * 	0 on Success / 1 on Failure
+ **/
+int scsi_tp_for_each_host(Scsi_Host_Template *shost_tp, int
+			    (*callback)(struct Scsi_Host *shost))
+{
+	struct list_head *lh, *lh_sf;
+	struct Scsi_Host *shost;
 
-/*
- *  When figure is run, we don't want to link to any object code.  Since
- *  the macro for each host will contain function pointers, we cannot
- *  use it and instead must use a "blank" that does no such
- *  idiocy.
- */
+	spin_lock(&scsi_host_list_lock);
 
-Scsi_Host_Template * scsi_hosts;
+	list_for_each_safe(lh, lh_sf, &scsi_host_list) {
+		shost = list_entry(lh, struct Scsi_Host, sh_list);
+		if (shost->hostt == shost_tp) {
+			spin_unlock(&scsi_host_list_lock);
+			callback(shost);
+			spin_lock(&scsi_host_list_lock);
+		}
+	}
 
+	spin_unlock(&scsi_host_list_lock);
 
-/*
- *  Our semaphores and timeout counters, where size depends on 
- *      MAX_SCSI_HOSTS here.
- */
+	return 0;
+}
 
-Scsi_Host_Name * scsi_host_no_list;
-struct Scsi_Host * scsi_hostlist;
-struct Scsi_Device_Template * scsi_devicelist;
+/**
+ * scsi_host_generic_release - default release function for hosts
+ * @shost: 
+ * 
+ * Description:
+ * 	This is the default case for the release function.  It should do
+ * 	the right thing for most correctly written host adapters.
+ **/
+static void scsi_host_generic_release(struct Scsi_Host *shost)
+{
+	if (shost->irq)
+		free_irq(shost->irq, NULL);
+	if (shost->dma_channel != 0xff)
+		free_dma(shost->dma_channel);
+	if (shost->io_port && shost->n_io_port)
+		release_region(shost->io_port, shost->n_io_port);
+}
+
+/**
+ * scsi_host_chk_and_release - check a scsi host for release and release
+ * @shost:	a pointer to a scsi host to release
+ *
+ * Return value:
+ * 	0 on Success / 1 on Failure
+ **/
+int scsi_host_chk_and_release(struct Scsi_Host *shost)
+{
+	int pcount;
+	Scsi_Device *sdev;
+	struct Scsi_Device_Template *sdev_tp;
+	Scsi_Cmnd *scmd;
+
+	/*
+	 * Current policy is all shosts go away on unregister.
+	 */
+	if (shost->hostt->module && GET_USE_COUNT(shost->hostt->module))
+		return 1;
+
+	/*
+	 * FIXME Do ref counting.  We force all of the devices offline to
+	 * help prevent race conditions where other hosts/processors could
+	 * try and get in and queue a command.
+	 */
+	for (sdev = shost->host_queue; sdev; sdev = sdev->next) 
+		sdev->online = FALSE;
+
+	for (sdev = shost->host_queue; sdev; sdev = sdev->next) {
+		/*
+		 * Loop over all of the commands associated with the
+		 * device.  If any of them are busy, then set the state
+		 * back to inactive and bail.
+		 */
+		for (scmd = sdev->device_queue; scmd; scmd = scmd->next) {
+			if (scmd->request && scmd->request->rq_status !=
+			    RQ_INACTIVE) {
+				printk(KERN_ERR "SCSI device not inactive"
+				       "- rq_status=%d, target=%d, pid=%ld,"
+				       "state=%d, owner=%d.\n",
+				       scmd->request->rq_status,
+				       scmd->target, scmd->pid,
+				       scmd->state, scmd->owner);
+				for (sdev = shost->host_queue; sdev;
+				     sdev = sdev->next) {
+					for (scmd = sdev->device_queue; scmd;
+					     scmd = scmd->next)
+						if (scmd->request->rq_status ==
+						    RQ_SCSI_DISCONNECTING)
+							scmd->request->rq_status = RQ_INACTIVE;
+				}
+				printk(KERN_ERR "Device busy???\n");
+				return 1;
+			}
+			/*
+			 * No, this device is really free.  Mark it as such, and
+			 * continue on.
+			 */
+			scmd->state = SCSI_STATE_DISCONNECTING;
+			if (scmd->request)
+				scmd->request->rq_status =
+					RQ_SCSI_DISCONNECTING;	/* Mark as
+								   busy */
+		}
+	}
 
-int max_scsi_hosts;
-int next_scsi_host;
-
-void
-scsi_unregister(struct Scsi_Host * sh){
-    struct Scsi_Host * shpnt;
-    Scsi_Host_Name *shn;
-        
-    if(scsi_hostlist == sh)
-	scsi_hostlist = sh->next;
-    else {
-	shpnt = scsi_hostlist;
-	while(shpnt->next != sh) shpnt = shpnt->next;
-	shpnt->next = shpnt->next->next;
-    }
-
-    /*
-     * We have to unregister the host from the scsi_host_no_list as well.
-     * Decide by the host_no not by the name because most host drivers are
-     * able to handle more than one adapters from the same kind (or family).
-     */
-    for ( shn=scsi_host_no_list; shn && (sh->host_no != shn->host_no);
-	  shn=shn->next);
-    if (shn) shn->host_registered = 0;
-    /* else {} : This should not happen, we should panic here... */
-    
-    /* If we are removing the last host registered, it is safe to reuse
-     * its host number (this avoids "holes" at boot time) (DB) 
-     * It is also safe to reuse those of numbers directly below which have
-     * been released earlier (to avoid some holes in numbering).
-     */
-    if(sh->host_no == max_scsi_hosts - 1) {
-	while(--max_scsi_hosts >= next_scsi_host) {
-	    shpnt = scsi_hostlist;
-	    while(shpnt && shpnt->host_no != max_scsi_hosts - 1)
-		shpnt = shpnt->next;
-	    if(shpnt)
-		break;
+	/*
+	 * Next we detach the high level drivers from the Scsi_Device
+	 * structures
+	 */
+	for (sdev = shost->host_queue; sdev; sdev = sdev->next) {
+		for (sdev_tp = scsi_devicelist; sdev_tp;
+		     sdev_tp = sdev_tp->next)
+			if (sdev_tp->detach)
+				(*sdev_tp->detach) (sdev);
+
+		/* If something still attached, punt */
+		if (sdev->attached) {
+			printk(KERN_ERR "Attached usage count = %d\n",
+			       sdev->attached);
+			return 1;
+		}
+
+		if (shost->hostt->slave_detach)
+			(*shost->hostt->slave_detach) (sdev);
+
+		devfs_unregister(sdev->de);
+		device_unregister(&sdev->sdev_driverfs_dev);
+	}
+
+	/* Next we free up the Scsi_Cmnd structures for this host */
+
+	for (sdev = shost->host_queue; sdev;
+	     sdev = shost->host_queue) {
+		scsi_release_commandblocks(sdev);
+		blk_cleanup_queue(&sdev->request_queue);
+		/* Next free up the Scsi_Device structures for this host */
+		shost->host_queue = sdev->next;
+		if (sdev->inquiry)
+			kfree(sdev->inquiry);
+		kfree(sdev);
+	}
+
+	/* Remove the instance of the individual hosts */
+	pcount = scsi_hosts_registered;
+	if (shost->hostt->release)
+		(*shost->hostt->release) (shost);
+	else {
+		scsi_host_generic_release(shost);
 	}
-    }
-    next_scsi_host--;
-    kfree((char *) sh);
+
+	if (pcount == scsi_hosts_registered)
+		scsi_unregister(shost);
+
+	return 0;
 }
 
-/* We call this when we come across a new host adapter. We only do this
- * once we are 100% sure that we want to use this host adapter -  it is a
- * pain to reverse this, so we try to avoid it 
- */
+/**
+ * scsi_unregister - unregister a scsi host
+ * @shost:	scsi host to be unregistered
+ **/
+void scsi_unregister(struct Scsi_Host *shost)
+{
+	struct list_head *lh;
+	Scsi_Host_Name *shost_name;
+
+	/* Remove shost from scsi_host_list */
+	spin_lock(&scsi_host_list_lock);
+	list_del(&shost->sh_list);
+	spin_unlock(&scsi_host_list_lock);
+
+	/* Unregister from scsi_host_hn_list */
+	list_for_each(lh, &scsi_host_hn_list) {
+		shost_name = list_entry(lh, Scsi_Host_Name, shn_list);
+		if (shost->host_no == shost_name->host_no)
+			shost_name->host_registered = 0;
+	}
+
+	/*
+	 * Next, kill the kernel error recovery thread for this host.
+	 */
+	if (shost->ehandler) {
+		DECLARE_MUTEX_LOCKED(sem);
+		shost->eh_notify = &sem;
+		send_sig(SIGHUP, shost->ehandler, 1);
+		down(&sem);
+		shost->eh_notify = NULL;
+	}
+
+	scsi_hosts_registered--;
+	shost->hostt->present--;
+
+	/* Cleanup proc and driverfs */
+#ifdef CONFIG_PROC_FS
+	scsi_proc_host_rm(shost);
+	if (!shost->hostt->present)
+		remove_proc_entry(shost->hostt->proc_name, proc_scsi);
+#endif
+	device_unregister(&shost->host_driverfs_dev);
+
+	kfree(shost);
+}
+
+/**
+ * scsi_host_hn_add - allocate and add new Scsi_Host_Name
+ * @name:	String to store in name field
+ *
+ * Return value:
+ * 	Pointer to a new Scsi_Host_Name
+ **/
+Scsi_Host_Name *scsi_host_hn_add(char *name)
+{
+	Scsi_Host_Name *shost_name;
+	int len;
+
+	len = strlen(name);
+	shost_name =  kmalloc(sizeof(*shost_name), GFP_KERNEL);
+	if (!shost_name) {
+		printk(KERN_ERR "%s: out of memory at line %d.\n",
+		       __FUNCTION__, __LINE__);
+		return NULL;
+	}
+	shost_name->name = kmalloc(len + 1, GFP_KERNEL);
+	if (!shost_name->name) {
+		kfree(shost_name);
+		printk(KERN_ERR "%s: out of memory at line %d.\n",
+		       __FUNCTION__, __LINE__);
+		return NULL;
+	}
+
+	if (len)
+		strncpy(shost_name->name, name, len);
+	shost_name->name[len] = 0;
+	shost_name->host_no = scsi_host_next_hn++;
+	shost_name->host_registered = 0;
+	list_add_tail(&shost_name->shn_list, &scsi_host_hn_list);
+
+	return shost_name;
+}
+
+/**
+ * scsi_register - register a scsi host adapter instance.
+ * @shost_tp:	pointer to scsi host template
+ * @xtr_bytes:	extra bytes to allocate for driver
+ *
+ * Note:
+ * 	We call this when we come across a new host adapter. We only do
+ * 	this once we are 100% sure that we want to use this host adapter -
+ * 	it is a pain to reverse this, so we try to avoid it 
+ *
+ * Return value:
+ * 	Pointer to a new Scsi_Host
+ **/
 extern int blk_nohighio;
-struct Scsi_Host * scsi_register(Scsi_Host_Template * tpnt, int j)
+struct Scsi_Host * scsi_register(Scsi_Host_Template *shost_tp, int xtr_bytes)
 {
-    struct Scsi_Host * retval, *shpnt, *o_shp;
-    Scsi_Host_Name *shn, *shn2;
-    int flag_new = 1;
-    const char * hname;
-    size_t hname_len;
-    retval = (struct Scsi_Host *)kmalloc(sizeof(struct Scsi_Host) + j,
-					 (tpnt->unchecked_isa_dma && j ? 
-					  GFP_DMA : 0) | GFP_ATOMIC);
-    if(retval == NULL)
-    {
-        printk("scsi: out of memory in scsi_register.\n");
-    	return NULL;
-    }
-    	
-    memset(retval, 0, sizeof(struct Scsi_Host) + j);
-
-    /* trying to find a reserved entry (host_no) */
-    hname = (tpnt->proc_name) ?  tpnt->proc_name : "";
-    hname_len = strlen(hname);
-    for (shn = scsi_host_no_list;shn;shn = shn->next) {
-	if (!(shn->host_registered) && 
-	    (hname_len > 0) && (0 == strncmp(hname, shn->name, hname_len))) {
-	    flag_new = 0;
-	    retval->host_no = shn->host_no;
-	    shn->host_registered = 1;
-	    break;
+	struct Scsi_Host *shost, *shost_scr;
+	Scsi_Host_Name *shost_name = NULL;
+	Scsi_Host_Name *shn = NULL;
+	char *hname;
+	size_t hname_len;
+	struct list_head *lh;
+	int gfp_mask;
+	DECLARE_MUTEX_LOCKED(sem);
+
+	gfp_mask = GFP_KERNEL;
+	if (shost_tp->unchecked_isa_dma && xtr_bytes)
+		gfp_mask |= __GFP_DMA;
+
+	shost = kmalloc(sizeof(struct Scsi_Host) + xtr_bytes, gfp_mask);
+	if (!shost) {
+		printk(KERN_ERR "%s: out of memory.\n", __FUNCTION__);
+		return NULL;
 	}
-    }
-    spin_lock_init(&retval->default_lock);
-    scsi_assign_lock(retval, &retval->default_lock);
-    atomic_set(&retval->host_active,0);
-    retval->host_busy = 0;
-    retval->host_failed = 0;
-    if (flag_new) {
-	shn = (Scsi_Host_Name *) kmalloc(sizeof(Scsi_Host_Name), GFP_ATOMIC);
-        if (!shn) {
-                kfree(retval);
-                printk(KERN_ERR "scsi: out of memory(2) in scsi_register.\n");
-                return NULL;
-        }
-	shn->name = kmalloc(hname_len + 1, GFP_ATOMIC);
-	if (hname_len > 0)
-	    strncpy(shn->name, hname, hname_len);
-	shn->name[hname_len] = 0;
-	shn->host_no = max_scsi_hosts++;
-	shn->host_registered = 1;
-	shn->next = NULL;
-	if (scsi_host_no_list) {
-	    for (shn2 = scsi_host_no_list;shn2->next;shn2 = shn2->next)
-		;
-	    shn2->next = shn;
+
+	memset(shost, 0, sizeof(struct Scsi_Host) + xtr_bytes);
+
+	/*
+	 * Determine host number. Check reserved first before allocating
+	 * new one
+	 */
+	hname = (shost_tp->proc_name) ?  shost_tp->proc_name : "";
+	hname_len = strlen(hname);
+
+	if (hname_len)
+		list_for_each(lh, &scsi_host_hn_list) {
+			shn = list_entry(lh, Scsi_Host_Name, shn_list);
+			if (!(shn->host_registered) &&
+			    !strncmp(hname, shn->name, hname_len)) {
+				shost_name = shn;
+				break;
+			}
+		}
+
+	if (!shost_name) {
+		shost_name = scsi_host_hn_add(hname);
+		if (!shost_name) {
+			kfree(shost);
+			return NULL;
+		}
 	}
-	else
-	    scsi_host_no_list = shn;
-	retval->host_no = shn->host_no;
-    }
-    next_scsi_host++;
-    retval->host_queue = NULL;
-    init_waitqueue_head(&retval->host_wait);
-    retval->resetting = 0;
-    retval->last_reset = 0;
-    retval->irq = 0;
-    retval->dma_channel = 0xff;
-
-    /* These three are default values which can be overridden */
-    retval->max_channel = 0; 
-    retval->max_id = 8;      
-    retval->max_lun = 8;
-
-    /*
-     * All drivers right now should be able to handle 12 byte commands.
-     * Every so often there are requests for 16 byte commands, but individual
-     * low-level drivers need to certify that they actually do something
-     * sensible with such commands.
-     */
-    retval->max_cmd_len = 12;
-
-    retval->unique_id = 0;
-    retval->io_port = 0;
-    retval->hostt = tpnt;
-    retval->next = NULL;
-    retval->in_recovery = 0;
-    retval->ehandler = NULL;    /* Initial value until the thing starts up. */
-    retval->eh_notify   = NULL;    /* Who we notify when we exit. */
-
-    retval->max_host_blocked = tpnt->max_host_blocked ? tpnt->max_host_blocked : SCSI_DEFAULT_HOST_BLOCKED;
-
-    retval->host_blocked = 0;
-    retval->host_self_blocked = FALSE;
+
+	shost->host_no = shost_name->host_no;
+	shost_name->host_registered = 1;
+	scsi_hosts_registered++;
+
+	spin_lock_init(&shost->default_lock);
+	scsi_assign_lock(shost, &shost->default_lock);
+	atomic_set(&shost->host_active,0);
+
+	init_waitqueue_head(&shost->host_wait);
+	shost->dma_channel = 0xff;
+
+	/* These three are default values which can be overridden */
+	shost->max_channel = 0;
+	shost->max_id = 8;
+	shost->max_lun = 8;
+
+	/*
+	 * All drivers right now should be able to handle 12 byte
+	 * commands.  Every so often there are requests for 16 byte
+	 * commands, but individual low-level drivers need to certify that
+	 * they actually do something sensible with such commands.
+	 */
+	shost->max_cmd_len = 12;
+	shost->hostt = shost_tp;
+	shost->host_blocked = FALSE;
+	shost->host_self_blocked = FALSE;
 
 #ifdef DEBUG
-    printk("Register %x %x: %d\n", (int)retval, (int)retval->hostt, j);
+	printk("%s: %x %x: %d\n", __FUNCTION_ (int)shost,
+	       (int)shost->hostt, xtr_bytes);
 #endif
 
-    /* The next six are the default values which can be overridden
-     * if need be */
-    retval->this_id = tpnt->this_id;
-    retval->can_queue = tpnt->can_queue;
-    retval->sg_tablesize = tpnt->sg_tablesize;
-    retval->cmd_per_lun = tpnt->cmd_per_lun;
-    retval->unchecked_isa_dma = tpnt->unchecked_isa_dma;
-    retval->use_clustering = tpnt->use_clustering;   
-    if (!blk_nohighio)
-	retval->highmem_io = tpnt->highmem_io;
-
-    retval->max_sectors = tpnt->max_sectors;
-    retval->use_blk_tcq = tpnt->use_blk_tcq;
-
-    if(!scsi_hostlist)
-	scsi_hostlist = retval;
-    else {
-	shpnt = scsi_hostlist;
-	if (retval->host_no < shpnt->host_no) {
-	    retval->next = shpnt;
-	    wmb(); /* want all to see these writes in this order */
-	    scsi_hostlist = retval;
+	/*
+	 * The next six are the default values which can be overridden if
+	 * need be
+	 */
+	shost->this_id = shost_tp->this_id;
+	shost->can_queue = shost_tp->can_queue;
+	shost->sg_tablesize = shost_tp->sg_tablesize;
+	shost->cmd_per_lun = shost_tp->cmd_per_lun;
+	shost->unchecked_isa_dma = shost_tp->unchecked_isa_dma;
+	shost->use_clustering = shost_tp->use_clustering;
+	if (!blk_nohighio)
+	shost->highmem_io = shost_tp->highmem_io;
+
+	shost->max_sectors = shost_tp->max_sectors;
+	shost->use_blk_tcq = shost_tp->use_blk_tcq;
+
+	spin_lock(&scsi_host_list_lock);
+	/*
+	 * FIXME When device naming is complete remove this step that
+	 * orders the scsi_host_list by host number and just do a
+	 * list_add_tail.
+	 */
+	list_for_each(lh, &scsi_host_list) {
+		shost_scr = list_entry(lh, struct Scsi_Host, sh_list);
+		if (shost->host_no < shost_scr->host_no) {
+			__list_add(&shost->sh_list, shost_scr->sh_list.prev,
+				   &shost_scr->sh_list);
+			goto found;
+		}
 	}
-	else {
-	    for (o_shp = shpnt, shpnt = shpnt->next; shpnt; 
-		 o_shp = shpnt, shpnt = shpnt->next) {
-		if (retval->host_no < shpnt->host_no) {
-		    retval->next = shpnt;
-		    wmb();
-		    o_shp->next = retval;
-		    break;
+	list_add_tail(&shost->sh_list, &scsi_host_list);
+found:
+	spin_unlock(&scsi_host_list_lock);
+
+#ifdef CONFIG_PROC_FS
+	/* Add the new driver to /proc/scsi if not already there */
+	if (!shost_tp->proc_dir)
+		scsi_proc_host_mkdir(shost_tp);
+	scsi_proc_host_add(shost);
+#endif
+
+	strncpy(shost->host_driverfs_dev.name, shost_tp->proc_name,
+		DEVICE_NAME_SIZE-1);
+	sprintf(shost->host_driverfs_dev.bus_id, "scsi%d",
+		shost->host_no);
+
+	shost->eh_notify = &sem;
+	kernel_thread((int (*)(void *)) scsi_error_handler, (void *) shost, 0);
+	/*
+	 * Now wait for the kernel error thread to initialize itself
+	 * as it might be needed when we scan the bus.
+	 */
+	down(&sem);
+	shost->eh_notify = NULL;
+
+	shost->hostt->present++;
+
+	return shost;
+}
+
+
+/**
+ * scsi_register_host - register a low level host driver
+ * @shost_tp:	pointer to a scsi host driver template
+ *
+ * Return value:
+ * 	0 on Success / 1 on Failure.
+ **/
+int scsi_register_host(Scsi_Host_Template *shost_tp)
+{
+	int cur_cnt;
+	Scsi_Device *sdev;
+	struct Scsi_Device_Template *sdev_tp;
+	struct list_head *lh;
+	struct Scsi_Host *shost;
+
+	/*
+	 * Check no detect routine.
+	 */
+	if (!shost_tp->detect)
+		return 1;
+
+	/* If max_sectors isn't set, default to max */
+	if (!shost_tp->max_sectors)
+		shost_tp->max_sectors = 1024;
+
+	cur_cnt = scsi_hosts_registered;
+
+	MOD_INC_USE_COUNT;
+
+	/*
+	 * The detect routine must carefully spinunlock/spinlock if it
+	 * enables interrupts, since all interrupt handlers do spinlock as
+	 * well.
+	 */
+
+	/*
+	 * detect should do its own locking
+	 * FIXME present is now set is scsi_register which breaks manual
+	 * registration code below.
+	 */
+	shost_tp->detect(shost_tp);
+
+	if (shost_tp->present) {
+			/*
+			 * FIXME Who needs manual registration and why???
+			 */
+		if (cur_cnt == scsi_hosts_registered) {
+			if (shost_tp->present > 1) {
+				printk(KERN_ERR "scsi: Failure to register"
+				       "low-level scsi driver");
+				scsi_unregister_host(shost_tp);
+				return 1;
+			}
+			/*
+			 * The low-level driver failed to register a driver.
+			 * We can do this now.
+			 */
+			if(scsi_register(shost_tp, 0)==NULL) {
+				printk(KERN_ERR "scsi: register failed.\n");
+				scsi_unregister_host(shost_tp);
+				return 1;
+			}
+		}
+
+		list_add_tail(&shost_tp->shtp_list, &scsi_host_tmpl_list);
+
+		/* The next step is to call scan_scsis here.  This generates the
+		 * Scsi_Devices entries
+		 */
+		list_for_each(lh, &scsi_host_list) {
+			shost = list_entry(lh, struct Scsi_Host, sh_list);
+			if (shost->hostt == shost_tp) {
+				const char *dm_name;
+				if (shost_tp->info) {
+					dm_name = shost_tp->info(shost);
+				} else {
+					dm_name = shost_tp->name;
+				}
+				printk(KERN_INFO "scsi%d : %s\n",
+				       shost->host_no, dm_name);
+
+				/* first register parent with driverfs */
+				device_register(&shost->host_driverfs_dev);
+				scan_scsis(shost, 0, 0, 0, 0);
+			}
+		}
+
+		for (sdev_tp = scsi_devicelist; sdev_tp;
+		     sdev_tp = sdev_tp->next) {
+			if (sdev_tp->init && sdev_tp->dev_noticed)
+				(*sdev_tp->init) ();
+		}
+
+		/*
+		 * Next we create the Scsi_Cmnd structures for this host 
+		 */
+		list_for_each(lh, &scsi_host_list) {
+			shost = list_entry(lh, struct Scsi_Host, sh_list);
+			for (sdev = shost->host_queue; sdev; sdev = sdev->next)
+				if (sdev->host->hostt == shost_tp) {
+					for (sdev_tp = scsi_devicelist;
+					     sdev_tp;
+					     sdev_tp = sdev_tp->next)
+						if (sdev_tp->attach)
+							(*sdev_tp->attach) (sdev);
+					if (sdev->attached) {
+						scsi_build_commandblocks(sdev);
+						if (sdev->current_queue_depth == 0)
+							goto out_of_space;
+					}
+				}
+		}
+
+		/* This does any final handling that is required. */
+		for (sdev_tp = scsi_devicelist; sdev_tp;
+		     sdev_tp = sdev_tp->next) {
+			if (sdev_tp->finish && sdev_tp->nr_dev) {
+				(*sdev_tp->finish) ();
+			}
 		}
-	    }
-	    if (! shpnt)
-		o_shp->next = retval;
-        }
-    }
-    
-    return retval;
+	}
+
+	return 0;
+
+out_of_space:
+	scsi_unregister_host(shost_tp); /* easiest way to clean up?? */
+	return 1;
+}
+
+/**
+ * scsi_unregister_host - unregister a low level host adapter driver
+ * @shost_tp:	scsi host template to unregister.
+ *
+ * Description:
+ * 	Similarly, this entry point should be called by a loadable module
+ * 	if it is trying to remove a low level scsi driver from the system.
+ *
+ * Return value:
+ * 	0 on Success / 1 on Failure
+ *
+ * Notes:
+ * 	rmmod does not care what we return here the module will be
+ * 	removed.
+ **/
+int scsi_unregister_host(Scsi_Host_Template *shost_tp)
+{
+	int pcount;
+
+	/* get the big kernel lock, so we don't race with open() */
+	lock_kernel();
+
+	pcount = scsi_hosts_registered;
+
+	scsi_tp_for_each_host(shost_tp, scsi_host_chk_and_release);
+
+	if (pcount != scsi_hosts_registered)
+		printk(KERN_INFO "scsi : %d host%s left.\n", scsi_hosts_registered,
+		       (scsi_hosts_registered == 1) ? "" : "s");
+
+	/*
+	 * Remove it from the list if all
+	 * hosts were successfully removed (ie preset == 0)
+	 */
+	if (!shost_tp->present) {
+		list_del(&shost_tp->shtp_list);
+	}
+
+	MOD_DEC_USE_COUNT;
+
+	unlock_kernel();
+	return 0;
+
+}
+
+/**
+ * *scsi_host_get_next - get scsi host and inc ref count
+ * @shost:	pointer to a Scsi_Host or NULL to start.
+ *
+ * Return value:
+ * 	A pointer to next Scsi_Host in list or NULL.
+ **/
+struct Scsi_Host *scsi_host_get_next(struct Scsi_Host *shost)
+{
+	struct list_head *lh = NULL;
+
+	spin_lock(&scsi_host_list_lock);
+	if (shost) {
+		/* XXX Dec ref on cur shost */
+		lh = shost->sh_list.next;
+	} else {
+		lh = scsi_host_list.next;
+	}
+
+	if (lh == &scsi_host_list) {
+		shost = (struct Scsi_Host *)NULL;
+		goto done;
+	}
+
+	shost = list_entry(lh, struct Scsi_Host, sh_list);
+	/* XXX Inc ref count */
+
+done:
+	spin_unlock(&scsi_host_list_lock);
+	return shost;
+}
+
+/**
+ * scsi_host_hn_get - get a Scsi_Host by host no and inc ref count
+ * @host_no:	host number to locate
+ *
+ * Return value:
+ * 	A pointer to located Scsi_Host or NULL.
+ **/
+struct Scsi_Host *scsi_host_hn_get(unsigned short host_no)
+{
+	struct list_head *lh;
+	struct Scsi_Host *shost;
+
+	spin_lock(&scsi_host_list_lock);
+	list_for_each(lh, &scsi_host_list) {
+		shost = list_entry(lh, struct Scsi_Host, sh_list);
+		if (shost->host_no == host_no) {
+			/* XXX Inc ref count */
+			goto done;
+		}
+	}
+
+	shost = (struct Scsi_Host *)NULL;
+done:
+	spin_unlock(&scsi_host_list_lock);
+	return shost;
+}
+
+/**
+ * *scsi_host_put - dec a Scsi_Host ref count
+ * @shost:	Pointer to Scsi_Host to dec.
+ **/
+void scsi_host_put(struct Scsi_Host *shost)
+{
+
+	/* XXX Get list lock */
+	/* XXX dec ref count */
+	/* XXX Release list lock */
+	return;
+}
+
+/**
+ * scsi_host_hn_init - init scsi host number list from string
+ * @shost_hn:	string of scsi host driver names.
+ **/
+void __init scsi_host_hn_init(char *shost_hn)
+{
+	char *temp = shost_hn;
+
+	while (temp) {
+		while (*temp && (*temp != ':') && (*temp != ','))
+			temp++;
+		if (!*temp)
+			temp = NULL;
+		else
+			*temp++ = 0;
+		(void)scsi_host_hn_add(shost_hn);
+		shost_hn = temp;
+	}
+}
+
+/**
+ * scsi_host_no_release - free all entries in scsi host number list
+ **/
+void __exit scsi_host_hn_release()
+{
+	struct list_head *lh, *next;
+	Scsi_Host_Name *shn;
+
+	list_for_each_safe(lh, next, &scsi_host_hn_list) {
+		shn = list_entry(lh, Scsi_Host_Name, shn_list);
+		if (shn->name)
+			kfree(shn->name);
+		kfree(shn);
+	}
 }
 
 void scsi_host_busy_inc(struct Scsi_Host *shost, Scsi_Device *sdev)
@@ -279,8 +761,7 @@ void scsi_host_busy_dec_and_test(struct Scsi_Host *shost, Scsi_Device *sdev)
 	if (shost->in_recovery && (shost->host_busy == shost->host_failed)) {
 		up(shost->eh_wait);
 		SCSI_LOG_ERROR_RECOVERY(5, printk("Waking error handler"
-					  "thread (%d)\n",
-					  atomic_read(&shost->eh_wait->count)));
+					  " thread\n"));
 	}
 	spin_unlock_irqrestore(shost->host_lock, flags);
 }
@@ -295,8 +776,7 @@ void scsi_host_failed_inc_and_test(struct Scsi_Host *shost)
 	if (shost->host_busy == shost->host_failed) {
 		up(shost->eh_wait);
 		SCSI_LOG_ERROR_RECOVERY(5, printk("Waking error handler"
-					  "thread (%d)\n",
-					  atomic_read(&shost->eh_wait->count)));
+					  " thread\n"));
 	}
 	spin_unlock_irqrestore(shost->host_lock, flags);
 }

drivers/scsi/hosts.h

@@ -16,15 +16,14 @@
  *  of the same type.
  *
  *  Jiffies wrap fixes (host->resetting), 3 Dec 1998 Andrea Arcangeli
+ *
+ *  Restructured scsi_host lists and associated functions.
+ *  September 04, 2002 Mike Anderson (andmike@us.ibm.com)
  */
 
 #ifndef _HOSTS_H
 #define _HOSTS_H
 
-/*
-    $Header: /vger/u4/cvs/linux/drivers/scsi/hosts.h,v 1.6 1997/01/19 23:07:13 davem Exp $
-*/
-
 #include <linux/config.h>
 #include <linux/proc_fs.h>
 #include <linux/pci.h>
@@ -58,8 +57,7 @@ typedef struct scsi_disk Disk;
 typedef struct	SHT
 {
 
-    /* Used with loadable modules so we can construct a linked list. */
-    struct SHT * next;
+    struct list_head	shtp_list;
 
     /* Used with loadable modules so that we know when it is safe to unload */
     struct module * module;
@@ -374,7 +372,7 @@ struct Scsi_Host
      * This information is private to the scsi mid-layer.  Wrapping it in a
      * struct private is a way of marking it in a sort of C++ type of way.
      */
-    struct Scsi_Host      * next;
+    struct list_head      sh_list;
     Scsi_Device           * host_queue;
     struct list_head	  all_scsi_hosts;
     struct list_head	  my_devices;
@@ -510,28 +508,26 @@ struct Scsi_Host
  * thing.  This physical pseudo-device isn't real and won't be available
  * from any high-level drivers.
  */
-extern void scsi_free_host_dev(Scsi_Device * SDpnt);
-extern Scsi_Device * scsi_get_host_dev(struct Scsi_Host * SHpnt);
+extern void scsi_free_host_dev(Scsi_Device *);
+extern Scsi_Device * scsi_get_host_dev(struct Scsi_Host *);
 
-extern void scsi_unblock_requests(struct Scsi_Host * SHpnt);
-extern void scsi_block_requests(struct Scsi_Host * SHpnt);
-extern void scsi_report_bus_reset(struct Scsi_Host * SHpnt, int channel);
+extern void scsi_unblock_requests(struct Scsi_Host *);
+extern void scsi_block_requests(struct Scsi_Host *);
+extern void scsi_report_bus_reset(struct Scsi_Host *, int);
 
 typedef struct SHN
-    {
-    struct SHN * next;
-    char * name;
-    unsigned short host_no;
-    unsigned short host_registered;
-    } Scsi_Host_Name;
+{
+	struct list_head shn_list;
+	char *name;
+	unsigned short host_no;
+	unsigned short host_registered;
+} Scsi_Host_Name;
 	
-extern Scsi_Host_Name * scsi_host_no_list;
-extern struct Scsi_Host * scsi_hostlist;
 extern struct Scsi_Device_Template * scsi_devicelist;
 
-extern Scsi_Host_Template * scsi_hosts;
-
-extern void build_proc_dir_entries(Scsi_Host_Template  *);
+extern void scsi_proc_host_mkdir(Scsi_Host_Template *);
+extern void scsi_proc_host_add(struct Scsi_Host *);
+extern void scsi_proc_host_rm(struct Scsi_Host *);
 
 /*
  *  scsi_init initializes the scsi hosts.
@@ -540,34 +536,33 @@ extern void build_proc_dir_entries(Scsi_Host_Template  *);
 extern int next_scsi_host;
 
 unsigned int scsi_init(void);
-extern struct Scsi_Host * scsi_register(Scsi_Host_Template *, int j);
-extern void scsi_unregister(struct Scsi_Host * i);
-extern void scsi_register_blocked_host(struct Scsi_Host * SHpnt);
-extern void scsi_deregister_blocked_host(struct Scsi_Host * SHpnt);
+extern struct Scsi_Host * scsi_register(Scsi_Host_Template *, int);
+extern void scsi_unregister(struct Scsi_Host *);
+extern void scsi_register_blocked_host(struct Scsi_Host *);
+extern void scsi_deregister_blocked_host(struct Scsi_Host *);
 
-static inline void scsi_assign_lock(struct Scsi_Host *host, spinlock_t *lock)
+static inline void scsi_assign_lock(struct Scsi_Host *shost, spinlock_t *lock)
 {
-	host->host_lock = lock;
+	shost->host_lock = lock;
 }
 
-static inline void scsi_set_pci_device(struct Scsi_Host *SHpnt,
+static inline void scsi_set_pci_device(struct Scsi_Host *shost,
                                        struct pci_dev *pdev)
 {
-	SHpnt->pci_dev = pdev;
-	SHpnt->host_driverfs_dev.parent=&pdev->dev;
+	shost->pci_dev = pdev;
+	shost->host_driverfs_dev.parent=&pdev->dev;
+
+	/* register parent with driverfs */
+	device_register(&shost->host_driverfs_dev);
 }
 
 
 /*
  * Prototypes for functions/data in scsi_scan.c
  */
-extern void scan_scsis(struct Scsi_Host *shpnt,
-		       uint hardcoded,
-		       uint hchannel,
-		       uint hid,
-                       uint hlun);
+extern void scan_scsis(struct Scsi_Host *, uint, uint, uint, uint);
 
-extern void scsi_mark_host_reset(struct Scsi_Host *Host);
+extern void scsi_mark_host_reset(struct Scsi_Host *);
 
 #define BLANK_HOST {"", 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
 
@@ -596,7 +591,7 @@ struct Scsi_Device_Template
     struct device_driver scsi_driverfs_driver;
 };
 
-void  scsi_initialize_queue(Scsi_Device * SDpnt, struct Scsi_Host * SHpnt);
+void  scsi_initialize_queue(Scsi_Device *, struct Scsi_Host *);
 
 
 /*
@@ -607,6 +602,12 @@ extern int scsi_unregister_device(struct Scsi_Device_Template *);
 extern int scsi_register_host(Scsi_Host_Template *);
 extern int scsi_unregister_host(Scsi_Host_Template *);
 
+extern struct Scsi_Host *scsi_host_get_next(struct Scsi_Host *);
+extern struct Scsi_Host *scsi_host_hn_get(unsigned short);
+extern void scsi_host_put(struct Scsi_Host *);
+extern void scsi_host_hn_init(char *);
+extern void scsi_host_hn_release(void);
+
 /*
  * host_busy inc/dec/test functions
  */
@@ -614,7 +615,6 @@ extern void scsi_host_busy_inc(struct Scsi_Host *, Scsi_Device *);
 extern void scsi_host_busy_dec_and_test(struct Scsi_Host *, Scsi_Device *);
 extern void scsi_host_failed_inc_and_test(struct Scsi_Host *);
 
-
 /*
  * This is an ugly hack.  If we expect to be able to load devices at run time,
  * we need to leave extra room in some of the data structures.	Doing a
@@ -643,21 +643,22 @@ extern void scsi_host_failed_inc_and_test(struct Scsi_Host *);
 
 /**
  * scsi_find_device - find a device given the host
+ * @shost:	SCSI host pointer
  * @channel:	SCSI channel (zero if only one channel)
  * @pun:	SCSI target number (physical unit number)
  * @lun:	SCSI Logical Unit Number
  **/
-static inline Scsi_Device *scsi_find_device(struct Scsi_Host *host,
+static inline Scsi_Device *scsi_find_device(struct Scsi_Host *shost,
                                             int channel, int pun, int lun) {
-        Scsi_Device *SDpnt;
+        Scsi_Device *sdev;
 
-        for(SDpnt = host->host_queue;
-            SDpnt != NULL;
-            SDpnt = SDpnt->next)
-                if(SDpnt->channel == channel && SDpnt->id == pun
-                   && SDpnt->lun ==lun)
+        for (sdev = shost->host_queue;
+            sdev != NULL;
+            sdev = sdev->next)
+                if (sdev->channel == channel && sdev->id == pun
+                   && sdev->lun ==lun)
                         break;
-        return SDpnt;
+        return sdev;
 }
     
 #endif

drivers/scsi/ips.h

@@ -407,7 +407,6 @@
     */
 #if LINUX_VERSION_CODE < LinuxVersionCode(2,4,0)
  #define IPS {                            \
-    next : NULL,                          \
     module : NULL,                        \
     proc_info : NULL,                     \
     proc_dir : NULL,                      \
@@ -437,7 +436,6 @@
 }
 #elif LINUX_VERSION_CODE < LinuxVersionCode(2,5,0)
  #define IPS {                            \
-    next : NULL,                          \
     module : NULL,                        \
     proc_info : NULL,                     \
     name : NULL,                          \
@@ -466,7 +464,6 @@
 }
 #else
  #define IPS {                            \
-    next : NULL,                          \
     module : NULL,                        \
     proc_info : NULL,                     \
     name : NULL,                          \

drivers/scsi/pcmcia/aha152x_stub.c

@@ -294,7 +294,8 @@ static void aha152x_config_cs(dev_link_t *link)
 
     tail = &link->dev;
     info->ndev = 0;
-    for (host = scsi_hostlist; host; host = host->next)
+    for (host = scsi_host_get_next(NULL); host;
+	 host = scsi_host_get_next(host))
 	if (host->hostt == &driver_template)
 	    for (dev = host->host_queue; dev; dev = dev->next) {
 	    u_long arg[2], id;

drivers/scsi/pcmcia/fdomain_stub.c

@@ -258,7 +258,8 @@ static void fdomain_config(dev_link_t *link)
 
     tail = &link->dev;
     info->ndev = 0;
-    for (host = scsi_hostlist; host; host = host->next)
+    for (host = scsi_host_get_next(NULL); host;
+	 host = scsi_host_get_next(host))
 	if (host->hostt == &driver_template)
 	    for (dev = host->host_queue; dev; dev = dev->next) {
 	    u_long arg[2], id;

drivers/scsi/pcmcia/nsp_cs.c

@@ -1520,7 +1520,8 @@ static void nsp_cs_config(dev_link_t *link)
 	DEBUG(0, "GET_SCSI_INFO\n");
 	tail = &link->dev;
 	info->ndev = 0;
-	for (host = scsi_hostlist; host != NULL; host = host->next) {
+	for (host = scsi_host_get_next(NULL); host;
+	     host = scsi_host_get_next(host))
 		if (host->hostt == &driver_template) {
 			for (dev = host->host_queue; dev != NULL; dev = dev->next) {
 				u_long arg[2], id;

drivers/scsi/pcmcia/qlogic_stub.c

@@ -281,7 +281,8 @@ static void qlogic_config(dev_link_t *link)
 
     tail = &link->dev;
     info->ndev = 0;
-    for (host = scsi_hostlist; host; host = host->next)
+	for (host = scsi_host_get_next(NULL); host;
+	     host = scsi_host_get_next(host))
 	if (host->hostt == &driver_template)
 	    for (dev = host->host_queue; dev; dev = dev->next) {
 	    u_long arg[2], id;

drivers/scsi/scsi.c

@@ -1659,33 +1659,6 @@ void scsi_adjust_queue_depth(Scsi_Device *SDpnt, int tagged, int tags)
 	}
 }
 
-void __init scsi_host_no_insert(char *str, int n)
-{
-    Scsi_Host_Name *shn, *shn2;
-    int len;
-    
-    len = strlen(str);
-    if (len && (shn = (Scsi_Host_Name *) kmalloc(sizeof(Scsi_Host_Name), GFP_ATOMIC))) {
-	if ((shn->name = kmalloc(len+1, GFP_ATOMIC))) {
-	    strncpy(shn->name, str, len);
-	    shn->name[len] = 0;
-	    shn->host_no = n;
-	    shn->host_registered = 0;
-	    shn->next = NULL;
-	    if (scsi_host_no_list) {
-		for (shn2 = scsi_host_no_list;shn2->next;shn2 = shn2->next)
-		    ;
-		shn2->next = shn;
-	    }
-	    else
-		scsi_host_no_list = shn;
-	    max_scsi_hosts = n+1;
-	}
-	else
-	    kfree((char *) shn);
-    }
-}
-
 #ifdef CONFIG_PROC_FS
 static int scsi_proc_info(char *buffer, char **start, off_t offset, int length)
 {
@@ -1698,7 +1671,8 @@ static int scsi_proc_info(char *buffer, char **start, off_t offset, int length)
 	/*
 	 * First, see if there are any attached devices or not.
 	 */
-	for (HBA_ptr = scsi_hostlist; HBA_ptr; HBA_ptr = HBA_ptr->next) {
+	for (HBA_ptr = scsi_host_get_next(NULL); HBA_ptr;
+	     HBA_ptr = scsi_host_get_next(HBA_ptr)) {
 		if (HBA_ptr->host_queue != NULL) {
 			break;
 		}
@@ -1706,7 +1680,8 @@ static int scsi_proc_info(char *buffer, char **start, off_t offset, int length)
 	size = sprintf(buffer + len, "Attached devices: %s\n", (HBA_ptr) ? "" : "none");
 	len += size;
 	pos = begin + len;
-	for (HBA_ptr = scsi_hostlist; HBA_ptr; HBA_ptr = HBA_ptr->next) {
+	for (HBA_ptr = scsi_host_get_next(NULL); HBA_ptr;
+	     HBA_ptr = scsi_host_get_next(HBA_ptr)) {
 #if 0
 		size += sprintf(buffer + len, "scsi%2d: %s\n", (int) HBA_ptr->host_no,
 				HBA_ptr->hostt->procname);
@@ -1873,7 +1848,8 @@ static int proc_scsi_gen_write(struct file * file, const char * buf,
 		printk(KERN_INFO "scsi singledevice %d %d %d %d\n", host, channel,
 		       id, lun);
 
-		for (HBA_ptr = scsi_hostlist; HBA_ptr; HBA_ptr = HBA_ptr->next) {
+		for (HBA_ptr = scsi_host_get_next(NULL); HBA_ptr;
+		     HBA_ptr = scsi_host_get_next(HBA_ptr)) {
 			if (HBA_ptr->host_no == host) {
 				break;
 			}
@@ -1918,7 +1894,8 @@ static int proc_scsi_gen_write(struct file * file, const char * buf,
 		lun = simple_strtoul(p + 1, &p, 0);
 
 
-		for (HBA_ptr = scsi_hostlist; HBA_ptr; HBA_ptr = HBA_ptr->next) {
+		for (HBA_ptr = scsi_host_get_next(NULL); HBA_ptr;
+		     HBA_ptr = scsi_host_get_next(HBA_ptr)) {
 			if (HBA_ptr->host_no == host) {
 				break;
 			}
@@ -1987,369 +1964,6 @@ static int proc_scsi_gen_write(struct file * file, const char * buf,
 }
 #endif
 
-/*
- * This entry point should be called by a driver if it is trying
- * to add a low level scsi driver to the system.
- */
-int scsi_register_host(Scsi_Host_Template * tpnt)
-{
-	int pcount;
-	struct Scsi_Host *shpnt;
-	Scsi_Device *SDpnt;
-	struct Scsi_Device_Template *sdtpnt;
-	const char *name;
-	int out_of_space = 0;
-
-	if (tpnt->next || !tpnt->detect)
-		return 1;	/* Must be already loaded, or
-				 * no detect routine available
-				 */
-
-	/* If max_sectors isn't set, default to max */
-	if (!tpnt->max_sectors)
-		tpnt->max_sectors = 1024;
-
-	pcount = next_scsi_host;
-
-	MOD_INC_USE_COUNT;
-
-	/* The detect routine must carefully spinunlock/spinlock if 
-	   it enables interrupts, since all interrupt handlers do 
-	   spinlock as well.  */
-
-	/*
-	 * detect should do its own locking
-	 */
-	tpnt->present = tpnt->detect(tpnt);
-
-	if (tpnt->present) {
-		if (pcount == next_scsi_host) {
-			if (tpnt->present > 1) {
-				printk(KERN_ERR "scsi: Failure to register low-level scsi driver");
-				scsi_unregister_host(tpnt);
-				return 1;
-			}
-			/* 
-			 * The low-level driver failed to register a driver.
-			 * We can do this now.
-			 */
-			if(scsi_register(tpnt, 0)==NULL)
-			{
-				printk(KERN_ERR "scsi: register failed.\n");
-				scsi_unregister_host(tpnt);
-				return 1;
-			}
-		}
-		tpnt->next = scsi_hosts;	/* Add to the linked list */
-		scsi_hosts = tpnt;
-
-		/* Add the new driver to /proc/scsi */
-#ifdef CONFIG_PROC_FS
-		build_proc_dir_entries(tpnt);
-#endif
-
-
-		/*
-		 * Add the kernel threads for each host adapter that will
-		 * handle error correction.
-		 */
-		for (shpnt = scsi_hostlist; shpnt; shpnt = shpnt->next) {
-			if (shpnt->hostt == tpnt) {
-				DECLARE_MUTEX_LOCKED(sem);
-
-				shpnt->eh_notify = &sem;
-				kernel_thread((int (*)(void *)) scsi_error_handler,
-					      (void *) shpnt, 0);
-
-				/*
-				 * Now wait for the kernel error thread to initialize itself
-				 * as it might be needed when we scan the bus.
-				 */
-				down(&sem);
-				shpnt->eh_notify = NULL;
-			}
-		}
-
-		for (shpnt = scsi_hostlist; shpnt; shpnt = shpnt->next) {
-			if (shpnt->hostt == tpnt) {
-				if (tpnt->info) {
-					name = tpnt->info(shpnt);
-				} else {
-					name = tpnt->name;
-				}
-				printk(KERN_INFO "scsi%d : %s\n",		/* And print a little message */
-				       shpnt->host_no, name);
-				strncpy(shpnt->host_driverfs_dev.name,name,
-					DEVICE_NAME_SIZE-1);
-				sprintf(shpnt->host_driverfs_dev.bus_id,
-					"scsi%d",
-					shpnt->host_no);
-			}
-		}
-
-		/* The next step is to call scan_scsis here.  This generates the
-		 * Scsi_Devices entries
-		 */
-		for (shpnt = scsi_hostlist; shpnt; shpnt = shpnt->next) {
-			if (shpnt->hostt == tpnt) {
-				/* first register parent with driverfs */
-				device_register(&shpnt->host_driverfs_dev);
-				scan_scsis(shpnt, 0, 0, 0, 0);
-			}
-		}
-
-		for (sdtpnt = scsi_devicelist; sdtpnt; sdtpnt = sdtpnt->next) {
-			if (sdtpnt->init && sdtpnt->dev_noticed)
-				(*sdtpnt->init) ();
-		}
-
-		/*
-		 * Next we create the Scsi_Cmnd structures for this host 
-		 */
-		for (shpnt = scsi_hostlist; shpnt; shpnt = shpnt->next) {
-			for (SDpnt = shpnt->host_queue; SDpnt; SDpnt = SDpnt->next)
-				if (SDpnt->host->hostt == tpnt) {
-					for (sdtpnt = scsi_devicelist; sdtpnt; sdtpnt = sdtpnt->next)
-						if (sdtpnt->attach)
-							(*sdtpnt->attach) (SDpnt);
-					if (SDpnt->attached) {
-						scsi_build_commandblocks(SDpnt);
-						if (SDpnt->current_queue_depth == 0)
-							out_of_space = 1;
-					}
-				}
-		}
-
-		/* This does any final handling that is required. */
-		for (sdtpnt = scsi_devicelist; sdtpnt; sdtpnt = sdtpnt->next) {
-			if (sdtpnt->finish && sdtpnt->nr_dev) {
-				(*sdtpnt->finish) ();
-			}
-		}
-	}
-
-	if (out_of_space) {
-		scsi_unregister_host(tpnt);	/* easiest way to clean up?? */
-		return 1;
-	} else
-		return 0;
-}
-
-/*
- * Similarly, this entry point should be called by a loadable module if it
- * is trying to remove a low level scsi driver from the system.
- */
-int scsi_unregister_host(Scsi_Host_Template * tpnt)
-{
-	int online_status;
-	int pcount0, pcount;
-	Scsi_Cmnd *SCpnt;
-	Scsi_Device *SDpnt;
-	Scsi_Device *SDpnt1;
-	struct Scsi_Device_Template *sdtpnt;
-	struct Scsi_Host *sh1;
-	struct Scsi_Host *shpnt;
-	char name[10];	/* host_no>=10^9? I don't think so. */
-
-	/* get the big kernel lock, so we don't race with open() */
-	lock_kernel();
-
-	/*
-	 * First verify that this host adapter is completely free with no pending
-	 * commands 
-	 */
-	for (shpnt = scsi_hostlist; shpnt; shpnt = shpnt->next) {
-		for (SDpnt = shpnt->host_queue; SDpnt;
-		     SDpnt = SDpnt->next) {
-			if (SDpnt->host->hostt == tpnt
-			    && SDpnt->host->hostt->module
-			    && GET_USE_COUNT(SDpnt->host->hostt->module))
-				goto err_out;
-			/* 
-			 * FIXME(eric) - We need to find a way to notify the
-			 * low level driver that we are shutting down - via the
-			 * special device entry that still needs to get added. 
-			 *
-			 * Is detach interface below good enough for this?
-			 */
-		}
-	}
-
-	/*
-	 * FIXME(eric) put a spinlock on this.  We force all of the devices offline
-	 * to help prevent race conditions where other hosts/processors could try and
-	 * get in and queue a command.
-	 */
-	for (shpnt = scsi_hostlist; shpnt; shpnt = shpnt->next) {
-		for (SDpnt = shpnt->host_queue; SDpnt;
-		     SDpnt = SDpnt->next) {
-			if (SDpnt->host->hostt == tpnt)
-				SDpnt->online = FALSE;
-
-		}
-	}
-
-	for (shpnt = scsi_hostlist; shpnt; shpnt = shpnt->next) {
-		if (shpnt->hostt != tpnt) {
-			continue;
-		}
-		for (SDpnt = shpnt->host_queue; SDpnt;
-		     SDpnt = SDpnt->next) {
-			/*
-			 * Loop over all of the commands associated with the device.  If any of
-			 * them are busy, then set the state back to inactive and bail.
-			 */
-			for (SCpnt = SDpnt->device_queue; SCpnt;
-			     SCpnt = SCpnt->next) {
-				online_status = SDpnt->online;
-				SDpnt->online = FALSE;
-				if (SCpnt->request && SCpnt->request->rq_status != RQ_INACTIVE) {
-					printk(KERN_ERR "SCSI device not inactive - rq_status=%d, target=%d, pid=%ld, state=%d, owner=%d.\n",
-					       SCpnt->request->rq_status, SCpnt->target, SCpnt->pid,
-					     SCpnt->state, SCpnt->owner);
-					for (SDpnt1 = shpnt->host_queue; SDpnt1;
-					     SDpnt1 = SDpnt1->next) {
-						for (SCpnt = SDpnt1->device_queue; SCpnt;
-						     SCpnt = SCpnt->next)
-							if (SCpnt->request->rq_status == RQ_SCSI_DISCONNECTING)
-								SCpnt->request->rq_status = RQ_INACTIVE;
-					}
-					SDpnt->online = online_status;
-					printk(KERN_ERR "Device busy???\n");
-					goto err_out;
-				}
-				/*
-				 * No, this device is really free.  Mark it as such, and
-				 * continue on.
-				 */
-				SCpnt->state = SCSI_STATE_DISCONNECTING;
-                                if(SCpnt->request)
-                                        SCpnt->request->rq_status = RQ_SCSI_DISCONNECTING;	/* Mark as busy */
-			}
-		}
-	}
-	/* Next we detach the high level drivers from the Scsi_Device structures */
-
-	for (shpnt = scsi_hostlist; shpnt; shpnt = shpnt->next) {
-		if (shpnt->hostt != tpnt) {
-			continue;
-		}
-		for (SDpnt = shpnt->host_queue; SDpnt;
-		     SDpnt = SDpnt->next) {
-			for (sdtpnt = scsi_devicelist; sdtpnt; sdtpnt = sdtpnt->next)
-				if (sdtpnt->detach)
-					(*sdtpnt->detach) (SDpnt);
-
-			/* If something still attached, punt */
-			if (SDpnt->attached) {
-				printk(KERN_ERR "Attached usage count = %d\n", SDpnt->attached);
-				goto err_out;
-			}
-			if (shpnt->hostt->slave_detach)
-				(*shpnt->hostt->slave_detach) (SDpnt);
-			devfs_unregister (SDpnt->de);
-			put_device(&SDpnt->sdev_driverfs_dev);
-		}
-	}
-
-	/*
-	 * Next, kill the kernel error recovery thread for this host.
-	 */
-	for (shpnt = scsi_hostlist; shpnt; shpnt = shpnt->next) {
-		if (shpnt->hostt == tpnt
-		    && shpnt->ehandler != NULL) {
-			DECLARE_MUTEX_LOCKED(sem);
-
-			shpnt->eh_notify = &sem;
-			send_sig(SIGHUP, shpnt->ehandler, 1);
-			down(&sem);
-			shpnt->eh_notify = NULL;
-		}
-	}
-
-	/* Next we free up the Scsi_Cmnd structures for this host */
-
-	for (shpnt = scsi_hostlist; shpnt; shpnt = shpnt->next) {
-		if (shpnt->hostt != tpnt) {
-			continue;
-		}
-		for (SDpnt = shpnt->host_queue; SDpnt;
-		     SDpnt = shpnt->host_queue) {
-			scsi_release_commandblocks(SDpnt);
-
-			blk_cleanup_queue(&SDpnt->request_queue);
-			/* Next free up the Scsi_Device structures for this host */
-			shpnt->host_queue = SDpnt->next;
-			if (SDpnt->inquiry)
-				kfree(SDpnt->inquiry);
-			kfree((char *) SDpnt);
-
-		}
-	}
-
-	/* Next we go through and remove the instances of the individual hosts
-	 * that were detected */
-
-	pcount0 = next_scsi_host;
-	for (shpnt = scsi_hostlist; shpnt; shpnt = sh1) {
-		sh1 = shpnt->next;
-		if (shpnt->hostt != tpnt)
-			continue;
-		pcount = next_scsi_host;
-		/* Remove the /proc/scsi directory entry */
-		sprintf(name,"%d",shpnt->host_no);
-		remove_proc_entry(name, tpnt->proc_dir);
-		put_device(&shpnt->host_driverfs_dev);
-		if (tpnt->release)
-			(*tpnt->release) (shpnt);
-		else {
-			/* This is the default case for the release function.
-			 * It should do the right thing for most correctly
-			 * written host adapters.
-			 */
-			if (shpnt->irq)
-				free_irq(shpnt->irq, NULL);
-			if (shpnt->dma_channel != 0xff)
-				free_dma(shpnt->dma_channel);
-			if (shpnt->io_port && shpnt->n_io_port)
-				release_region(shpnt->io_port, shpnt->n_io_port);
-		}
-		if (pcount == next_scsi_host)
-			scsi_unregister(shpnt);
-		tpnt->present--;
-	}
-
-	if (pcount0 != next_scsi_host)
-		printk(KERN_INFO "scsi : %d host%s left.\n", next_scsi_host,
-		       (next_scsi_host == 1) ? "" : "s");
-
-	/*
-	 * Remove it from the linked list and /proc if all
-	 * hosts were successfully removed (ie preset == 0)
-	 */
-	if (!tpnt->present) {
-		Scsi_Host_Template **SHTp = &scsi_hosts;
-		Scsi_Host_Template *SHT;
-
-		while ((SHT = *SHTp) != NULL) {
-			if (SHT == tpnt) {
-				*SHTp = SHT->next;
-				remove_proc_entry(tpnt->proc_name, proc_scsi);
-				break;
-			}
-			SHTp = &SHT->next;
-		}
-	}
-	MOD_DEC_USE_COUNT;
-
-	unlock_kernel();
-	return 0;
-
-err_out:
-	unlock_kernel();
-	return -1;
-}
-
 /*
  * This entry point should be called by a loadable module if it is trying
  * add a high level scsi driver to the system.
@@ -2361,7 +1975,7 @@ int scsi_register_device(struct Scsi_Device_Template *tpnt)
 	int out_of_space = 0;
 
 #ifdef CONFIG_KMOD
-	if (scsi_hosts == NULL)
+	if (scsi_host_get_next(NULL) == NULL)
 		request_module("scsi_hostadapter");
 #endif
 
@@ -2375,7 +1989,8 @@ int scsi_register_device(struct Scsi_Device_Template *tpnt)
 	 * First scan the devices that we know about, and see if we notice them.
 	 */
 
-	for (shpnt = scsi_hostlist; shpnt; shpnt = shpnt->next) {
+	for (shpnt = scsi_host_get_next(NULL); shpnt;
+	     shpnt = scsi_host_get_next(shpnt)) {
 		for (SDpnt = shpnt->host_queue; SDpnt;
 		     SDpnt = SDpnt->next) {
 			if (tpnt->detect)
@@ -2394,7 +2009,8 @@ int scsi_register_device(struct Scsi_Device_Template *tpnt)
 	/*
 	 * Now actually connect the devices to the new driver.
 	 */
-	for (shpnt = scsi_hostlist; shpnt; shpnt = shpnt->next) {
+	for (shpnt = scsi_host_get_next(NULL); shpnt;
+	     shpnt = scsi_host_get_next(shpnt)) {
 		for (SDpnt = shpnt->host_queue; SDpnt;
 		     SDpnt = SDpnt->next) {
 			if (tpnt->attach)
@@ -2444,7 +2060,8 @@ int scsi_unregister_device(struct Scsi_Device_Template *tpnt)
 	 * Next, detach the devices from the driver.
 	 */
 
-	for (shpnt = scsi_hostlist; shpnt; shpnt = shpnt->next) {
+	for (shpnt = scsi_host_get_next(NULL); shpnt;
+	     shpnt = scsi_host_get_next(shpnt)) {
 		for (SDpnt = shpnt->host_queue; SDpnt;
 		     SDpnt = SDpnt->next) {
 			if (tpnt->detach)
@@ -2516,7 +2133,8 @@ static void scsi_dump_status(int level)
 	Scsi_Device *SDpnt;
 	printk(KERN_INFO "Dump of scsi host parameters:\n");
 	i = 0;
-	for (shpnt = scsi_hostlist; shpnt; shpnt = shpnt->next) {
+	for (shpnt = scsi_host_get_next(NULL); shpnt;
+	     shpnt = scsi_host_get_next(shpnt)) {
 		printk(KERN_INFO " %d %d %d : %d %d\n",
 		       shpnt->host_failed,
 		       shpnt->host_busy,
@@ -2527,7 +2145,8 @@ static void scsi_dump_status(int level)
 
 	printk(KERN_INFO "\n\n");
 	printk(KERN_INFO "Dump of scsi command parameters:\n");
-	for (shpnt = scsi_hostlist; shpnt; shpnt = shpnt->next) {
+	for (shpnt = scsi_host_get_next(NULL); shpnt;
+	     shpnt = scsi_host_get_next(shpnt)) {
 		printk(KERN_INFO "h:c:t:l (dev sect nsect cnumsec sg) (ret all flg) (to/cmd to ito) cmd snse result\n");
 		for (SDpnt = shpnt->host_queue; SDpnt; SDpnt = SDpnt->next) {
 			for (SCpnt = SDpnt->device_queue; SCpnt; SCpnt = SCpnt->next) {
@@ -2565,26 +2184,6 @@ static void scsi_dump_status(int level)
 }
 #endif				/* CONFIG_PROC_FS */
 
-static int __init scsi_host_no_init (char *str)
-{
-    static int next_no = 0;
-    char *temp;
-
-    while (str) {
-	temp = str;
-	while (*temp && (*temp != ':') && (*temp != ','))
-	    temp++;
-	if (!*temp)
-	    temp = NULL;
-	else
-	    *temp++ = 0;
-	scsi_host_no_insert(str, next_no);
-	str = temp;
-	next_no++;
-    }
-    return 1;
-}
-
 static char *scsihosts;
 
 MODULE_PARM(scsihosts, "s");
@@ -2724,9 +2323,8 @@ static int __init init_scsi(void)
 #endif
 
         scsi_devfs_handle = devfs_mk_dir (NULL, "scsi", NULL);
-        if (scsihosts)
-		printk(KERN_INFO "scsi: host order: %s\n", scsihosts);	
-	scsi_host_no_init (scsihosts);
+
+	scsi_host_hn_init(scsihosts);
 
 	bus_register(&scsi_driverfs_bus_type);
 
@@ -2738,19 +2336,11 @@ static int __init init_scsi(void)
 
 static void __exit exit_scsi(void)
 {
-	Scsi_Host_Name *shn, *shn2 = NULL;
 	int i;
 
         devfs_unregister (scsi_devfs_handle);
-        for (shn = scsi_host_no_list;shn;shn = shn->next) {
-		if (shn->name)
-			kfree(shn->name);
-                if (shn2)
-			kfree (shn2);
-                shn2 = shn;
-        }
-        if (shn2)
-		kfree (shn2);
+
+	scsi_host_hn_release();
 
 #ifdef CONFIG_PROC_FS
 	/* No, we're not here anymore. Don't show the /proc/scsi files. */

drivers/scsi/scsi_proc.c

@@ -119,35 +119,44 @@ static int proc_scsi_write(struct file * file, const char * buf,
 	return(ret);
 }
 
-void build_proc_dir_entries(Scsi_Host_Template * tpnt)
+void scsi_proc_host_mkdir(Scsi_Host_Template *shost_tp)
 {
-	struct Scsi_Host *hpnt;
-	char name[10];	/* see scsi_unregister_host() */
-
-	tpnt->proc_dir = proc_mkdir(tpnt->proc_name, proc_scsi);
-        if (!tpnt->proc_dir) {
-                printk(KERN_ERR "Unable to proc_mkdir in scsi.c/build_proc_dir_entries");
+	shost_tp->proc_dir = proc_mkdir(shost_tp->proc_name, proc_scsi);
+        if (!shost_tp->proc_dir) {
+		printk(KERN_ERR "%s: proc_mkdir failed for %s\n",
+		       __FUNCTION__, shost_tp->proc_name);
                 return;
         }
-	tpnt->proc_dir->owner = tpnt->module;
-
-	hpnt = scsi_hostlist;
-	while (hpnt) {
-		if (tpnt == hpnt->hostt) {
-			struct proc_dir_entry *p;
-			sprintf(name,"%d",hpnt->host_no);
-			p = create_proc_read_entry(name,
-					S_IFREG | S_IRUGO | S_IWUSR,
-					tpnt->proc_dir,
-					proc_scsi_read,
-					(void *)hpnt);
-			if (!p)
-				panic("Not enough memory to register SCSI HBA in /proc/scsi !\n");
-			p->write_proc=proc_scsi_write;
-			p->owner = tpnt->module;
-		}
-		hpnt = hpnt->next;
+	shost_tp->proc_dir->owner = shost_tp->module;
+}
+
+void scsi_proc_host_add(struct Scsi_Host *shost)
+{
+	char name[10];
+	struct proc_dir_entry *p;
+
+	sprintf(name,"%d",shost->host_no);
+	p = create_proc_read_entry(name,
+			S_IFREG | S_IRUGO | S_IWUSR,
+			shost->hostt->proc_dir,
+			proc_scsi_read,
+			(void *)shost);
+	if (!p) {
+		printk(KERN_ERR "%s: Failed to register host %d in"
+		       "%s\n", __FUNCTION__, shost->host_no,
+		       shost->hostt->proc_name);
+	} else {
+		p->write_proc=proc_scsi_write;
+		p->owner = shost->hostt->module;
 	}
+
+}
+
+void scsi_proc_host_rm(struct Scsi_Host *shost)
+{
+	char name[10];
+	sprintf(name,"%d",shost->host_no);
+	remove_proc_entry(name, shost->hostt->proc_dir);
 }
 
 /*

drivers/scsi/scsi_syms.c

@@ -91,8 +91,9 @@ EXPORT_SYMBOL(scsi_reset_provider);
 /*
  * These are here only while I debug the rest of the scsi stuff.
  */
-EXPORT_SYMBOL(scsi_hostlist);
-EXPORT_SYMBOL(scsi_hosts);
+EXPORT_SYMBOL(scsi_host_get_next);
+EXPORT_SYMBOL(scsi_host_hn_get);
+EXPORT_SYMBOL(scsi_host_put);
 EXPORT_SYMBOL(scsi_devicelist);
 EXPORT_SYMBOL(scsi_device_types);
 

drivers/scsi/sg.c

@@ -3103,7 +3103,8 @@ sg_proc_host_info(char *buffer, int *len, off_t * begin, off_t offset, int size)
 	struct Scsi_Host *shp;
 	int k;
 
-	for (k = 0, shp = scsi_hostlist; shp; shp = shp->next, ++k) {
+	for (k = 0, shp = scsi_host_get_next(NULL); shp;
+	     shp = scsi_host_get_next(shp), ++k) {
 		for (; k < shp->host_no; ++k)
 			PRINT_PROC("-1\t-1\t-1\t-1\t-1\t-1\n");
 		PRINT_PROC("%u\t%hu\t%hd\t%hu\t%d\t%d\n",
@@ -3147,7 +3148,8 @@ sg_proc_hoststrs_info(char *buffer, int *len, off_t * begin,
 	char buff[SG_MAX_HOST_STR_LEN];
 	char *cp;
 
-	for (k = 0, shp = scsi_hostlist; shp; shp = shp->next, ++k) {
+	for (k = 0, shp = scsi_host_get_next(NULL); shp;
+	     shp = scsi_host_get_next(shp), ++k) {
 		for (; k < shp->host_no; ++k)
 			PRINT_PROC("<no active host>\n");
 		strncpy(buff, shp->hostt->info ? shp->hostt->info(shp) :

drivers/scsi/wd33c93.c

@@ -1871,10 +1871,7 @@ Scsi_Cmnd *cmd;
 int x,i;
 static int stop = 0;
 
-   for (instance=scsi_hostlist; instance; instance=instance->next) {
-      if (instance->host_no == hn)
-         break;
-      }
+   instance = scsi_host_hn_get(hn);
    if (!instance) {
       printk("*** Hmm... Can't find host #%d!\n",hn);
       return (-ESRCH);