[PATCH] scsi host cleanup 3/3 (driver changes)

If you read my previous post on this patch I indicated that few of the
driver changes I was only able to compile test ( block/cciss_scsi.c,
scsi/53c700.c, scsi/pcmcia/*, scsi/wd33c93.c). The changes to the
drivers are to remove the old interfaces and possibly extra NULL inits
of struct members. These changes will need to be ok'd by there
respective maintainers. I did receive feedback from two.

I have tested these changes on ips, aic, qlogicisp, and scsi_debug
drivers.

This is a resend of my previous patch clean ups to the scsi_host lists.

	* Made function naming consistent with rest of SCSI
	* Corrected a problem with driverfs registration to early. Also
	  changed from put_device to device_unregister.
        * Fixed a regression in my previous patch that the scsi_host
          list was not sorted by host number. When we get some device
          naming this hack can be removed.
        * Switch scsi host template, name, host lists to struct
          list_head's.
        * Moved all scsi_host related register / unregister functions
          into hosts.c
        * Added list accessor interface and created a function similar
          to driverfs bus_for_each_dev.

The full patch is available at:
http://www-124.ibm.com/storageio/patches/2.5/scsi-host

-andmike
--
Michael Anderson
andmike@us.ibm.com

 acorn/scsi/acornscsi.c            |    6 ++----
 acorn/scsi/arxescsi.c             |    8 ++------
 acorn/scsi/cumana_2.c             |    8 ++------
 acorn/scsi/eesox.c                |    8 ++------
 acorn/scsi/powertec.c             |    8 ++------
 block/cciss_scsi.c                |   21 ++-------------------
 scsi/53c700.c                     |    6 ++----
 scsi/aic7xxx/aic7xxx_linux_host.h |    1 -
 scsi/cpqfcTSinit.c                |    4 +---
 scsi/fcal.c                       |    4 +---
 scsi/ips.h                        |    3 ---
 scsi/pcmcia/aha152x_stub.c        |    3 ++-
 scsi/pcmcia/fdomain_stub.c        |    3 ++-
 scsi/pcmcia/nsp_cs.c              |    3 ++-
 scsi/pcmcia/qlogic_stub.c         |    3 ++-
 scsi/wd33c93.c                    |    5 +----
 16 files changed, 25 insertions(+), 69 deletions(-)

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

@@ -1719,13 +1719,11 @@ 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/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/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);