[PATCH] Make dss1_divert ISDN module work on SMP again

When I switched my installation from kernel 2.4 to 2.6 I recognized that
the ISDN module dss1_divert was marked incompilable (config option
CONFIG_CLEAN_COMPILE must be turned off). 

The compile problem was the obsolete using of kernel 2.4 critical
sections.  I replaced the cli() stuff with spinlocks as explained in the
Documentation/spinlocks.txt file.  After that the module compiles and
runs as expected. 
Signed-off-by: Steffen A. Mork <linux-dev@morknet.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/isdn/divert/divert_init.c

@@ -12,6 +12,7 @@
 #include <linux/module.h>
 #include <linux/version.h>
 #include <linux/init.h>
+
 #include "isdn_divert.h"
 
 MODULE_DESCRIPTION("ISDN4Linux: Call diversion support");
@@ -59,23 +60,24 @@ static int __init divert_init(void)
 /* Module deinit code */
 /**********************/
 static void __exit divert_exit(void)
-{ unsigned long flags;
+{
+  unsigned long flags;
+  spinlock_t divert_lock = SPIN_LOCK_UNLOCKED;
   int i;
 
-  save_flags(flags);
-  cli();
+  spin_lock_irqsave(&divert_lock, flags);
   divert_if.cmd = DIVERT_CMD_REL; /* release */
   if ((i = DIVERT_REG_NAME(&divert_if)) != DIVERT_NO_ERR)
    { printk(KERN_WARNING "dss1_divert: error %d releasing module\n",i);
-     restore_flags(flags);
+     spin_unlock_irqrestore(&divert_lock, flags);
      return;
    } 
   if (divert_dev_deinit()) 
    { printk(KERN_WARNING "dss1_divert: device busy, remove cancelled\n");
-     restore_flags(flags);
+     spin_unlock_irqrestore(&divert_lock, flags);
      return;
    }
-  restore_flags(flags);
+  spin_unlock_irqrestore(&divert_lock, flags);
   deleterule(-1); /* delete all rules and free mem */
   deleteprocs();
   printk(KERN_INFO "dss1_divert module successfully removed \n");

drivers/isdn/divert/divert_procfs.c

@@ -22,6 +22,7 @@
 #include <linux/isdnif.h>
 #include "isdn_divert.h"
 
+
 /*********************************/
 /* Variables for interface queue */
 /*********************************/
@@ -181,6 +182,7 @@ isdn_divert_ioctl(struct inode *inode, struct file *file,
 	divert_ioctl dioctl;
 	int i;
 	unsigned long flags;
+	spinlock_t divert_lock = SPIN_LOCK_UNLOCKED;
 	divert_rule *rulep;
 	char *cp;
 
@@ -215,10 +217,9 @@ isdn_divert_ioctl(struct inode *inode, struct file *file,
 		case IIOCMODRULE:
 			if (!(rulep = getruleptr(dioctl.getsetrule.ruleidx)))
 				return (-EINVAL);
-			save_flags(flags);
-			cli();
+            spin_lock_irqsave(&divert_lock, flags);
 			*rulep = dioctl.getsetrule.rule;	/* copy data */
-			restore_flags(flags);
+			spin_unlock_irqrestore(&divert_lock, flags);
 			return (0);	/* no copy required */
 			break;
 

drivers/isdn/divert/isdn_divert.c

@@ -11,6 +11,7 @@
 
 #include <linux/version.h>
 #include <linux/proc_fs.h>
+
 #include "isdn_divert.h"
 
 /**********************************/
@@ -51,50 +52,48 @@ static unsigned char extern_wait_max = 4; /* maximum wait in s for external proc
 /* timer callback function */
 /***************************/
 static void deflect_timer_expire(ulong arg)
-{ unsigned long flags;
+{
+  unsigned long flags;
+  spinlock_t divert_lock = SPIN_LOCK_UNLOCKED;
   struct call_struc *cs = (struct call_struc *) arg;
 
-  save_flags(flags);
-  cli();
+  spin_lock_irqsave(&divert_lock, flags);
   del_timer(&cs->timer); /* delete active timer */
-  restore_flags(flags);
+  spin_unlock_irqrestore(&divert_lock, flags);
 
   switch(cs->akt_state)
    { case DEFLECT_PROCEED:
        cs->ics.command = ISDN_CMD_HANGUP; /* cancel action */
        divert_if.ll_cmd(&cs->ics);                   	  
-       save_flags(flags);
-       cli();
+       spin_lock_irqsave(&divert_lock, flags);
        cs->akt_state = DEFLECT_AUTODEL; /* delete after timeout */
        cs->timer.expires = jiffies + (HZ * AUTODEL_TIME);
        add_timer(&cs->timer);
-       restore_flags(flags); 
+       spin_unlock_irqrestore(&divert_lock, flags);
        break;
 
      case DEFLECT_ALERT:
        cs->ics.command = ISDN_CMD_REDIR; /* protocol */
        strcpy(cs->ics.parm.setup.phone,cs->deflect_dest);
        strcpy(cs->ics.parm.setup.eazmsn,"Testtext delayed");
-       divert_if.ll_cmd(&cs->ics);                   	  
-       save_flags(flags);
-       cli();
+       divert_if.ll_cmd(&cs->ics);
+       spin_lock_irqsave(&divert_lock, flags);
        cs->akt_state = DEFLECT_AUTODEL; /* delete after timeout */
        cs->timer.expires = jiffies + (HZ * AUTODEL_TIME);
        add_timer(&cs->timer);
-       restore_flags(flags); 
+       spin_unlock_irqrestore(&divert_lock, flags);
        break;
 
      case DEFLECT_AUTODEL:
      default:
-       save_flags(flags);
-       cli();
+       spin_lock_irqsave(&divert_lock, flags);
        if (cs->prev) 
          cs->prev->next = cs->next; /* forward link */
         else
          divert_head = cs->next;
        if (cs->next)
          cs->next->prev = cs->prev; /* back link */           
-       restore_flags(flags); 
+       spin_unlock_irqrestore(&divert_lock, flags);
        kfree(cs);
        return;
 
@@ -110,6 +109,7 @@ int cf_command(int drvid, int mode,
                u_char proc, char *msn, 
                u_char service, char *fwd_nr, ulong *procid)
 { unsigned long flags;
+  spinlock_t divert_lock = SPIN_LOCK_UNLOCKED;
   int retval,msnlen;
   int fwd_len;
   char *p,*ielenp,tmp[60];
@@ -166,10 +166,9 @@ int cf_command(int drvid, int mode,
   cs->ics.parm.dss1_io.datalen = p - tmp; /* total len */
   cs->ics.parm.dss1_io.data = tmp; /* start of buffer */
   
-  save_flags(flags);
-  cli();
+  spin_lock_irqsave(&divert_lock, flags);
   cs->ics.parm.dss1_io.ll_id = next_id++; /* id for callback */
-  restore_flags(flags);
+  spin_unlock_irqrestore(&divert_lock, flags);
   *procid = cs->ics.parm.dss1_io.ll_id;  
 
   sprintf(cs->info,"%d 0x%lx %s%s 0 %s %02x %d%s%s\n",
@@ -187,11 +186,10 @@ int cf_command(int drvid, int mode,
 
   if (!retval)
    { cs->prev = NULL;
-     save_flags(flags);
-     cli();
+     spin_lock_irqsave(&divert_lock, flags);
      cs->next = divert_head;
      divert_head = cs; 
-     restore_flags(flags);
+     spin_unlock_irqrestore(&divert_lock, flags);
    }
   else
    kfree(cs);
@@ -206,6 +204,7 @@ int deflect_extern_action(u_char cmd, ulong callid, char *to_nr)
 { struct call_struc *cs;
   isdn_ctrl ic;
   unsigned long flags;
+  spinlock_t divert_lock = SPIN_LOCK_UNLOCKED;
   int i;
 
   if ((cmd & 0x7F) > 2) return(-EINVAL); /* invalid command */
@@ -224,13 +223,12 @@ int deflect_extern_action(u_char cmd, ulong callid, char *to_nr)
    { case 0: /* hangup */
        del_timer(&cs->timer); 
        ic.command = ISDN_CMD_HANGUP;
-       i = divert_if.ll_cmd(&ic);                   	  
-       save_flags(flags);
-       cli();
+       i = divert_if.ll_cmd(&ic);
+       spin_lock_irqsave(&divert_lock, flags);
        cs->akt_state = DEFLECT_AUTODEL; /* delete after timeout */
        cs->timer.expires = jiffies + (HZ * AUTODEL_TIME);
        add_timer(&cs->timer);
-       restore_flags(flags); 
+       spin_unlock_irqrestore(&divert_lock, flags);
      break;      
 
      case 1: /* alert */
@@ -239,12 +237,12 @@ int deflect_extern_action(u_char cmd, ulong callid, char *to_nr)
        del_timer(&cs->timer); 
        ic.command = ISDN_CMD_ALERT;
        if ((i = divert_if.ll_cmd(&ic)))
-	{ save_flags(flags);
-          cli();
+	{
+          spin_lock_irqsave(&divert_lock, flags);
           cs->akt_state = DEFLECT_AUTODEL; /* delete after timeout */
           cs->timer.expires = jiffies + (HZ * AUTODEL_TIME);
           add_timer(&cs->timer);
-          restore_flags(flags);
+          spin_unlock_irqrestore(&divert_lock, flags);
         }
        else
           cs->akt_state = DEFLECT_ALERT; 
@@ -256,12 +254,12 @@ int deflect_extern_action(u_char cmd, ulong callid, char *to_nr)
        strcpy(cs->ics.parm.setup.eazmsn, "Testtext manual");
        ic.command = ISDN_CMD_REDIR;
        if ((i = divert_if.ll_cmd(&ic)))
-	{ save_flags(flags);
-          cli();
+	{
+          spin_lock_irqsave(&divert_lock, flags);
           cs->akt_state = DEFLECT_AUTODEL; /* delete after timeout */
           cs->timer.expires = jiffies + (HZ * AUTODEL_TIME);
           add_timer(&cs->timer);
-          restore_flags(flags);
+          spin_unlock_irqrestore(&divert_lock, flags);
         }
        else
           cs->akt_state = DEFLECT_ALERT; 
@@ -277,6 +275,7 @@ int deflect_extern_action(u_char cmd, ulong callid, char *to_nr)
 int insertrule(int idx, divert_rule *newrule)
 { struct deflect_struc *ds,*ds1=NULL;
   unsigned long flags;
+  spinlock_t divert_lock = SPIN_LOCK_UNLOCKED;
 
   if (!(ds = (struct deflect_struc *) kmalloc(sizeof(struct deflect_struc), 
                                               GFP_KERNEL))) 
@@ -284,8 +283,7 @@ int insertrule(int idx, divert_rule *newrule)
 
   ds->rule = *newrule; /* set rule */
 
-  save_flags(flags);
-  cli();
+  spin_lock_irqsave(&divert_lock, flags);
 
   if (idx >= 0)
    { ds1 = table_head;
@@ -313,7 +311,7 @@ int insertrule(int idx, divert_rule *newrule)
         table_head = ds; /* first element */
    }
 
-  restore_flags(flags);
+  spin_unlock_irqrestore(&divert_lock, flags);
   return(0);
 } /* insertrule */
 
@@ -323,14 +321,14 @@ int insertrule(int idx, divert_rule *newrule)
 int deleterule(int idx)
 { struct deflect_struc *ds,*ds1;
   unsigned long flags;
+  spinlock_t divert_lock = SPIN_LOCK_UNLOCKED;
   
   if (idx < 0) 
-   { save_flags(flags);
-     cli();
+   { spin_lock_irqsave(&divert_lock, flags);
      ds = table_head;
      table_head = NULL;
      table_tail = NULL;
-     restore_flags(flags);
+     spin_unlock_irqrestore(&divert_lock, flags);
      while (ds)
       { ds1 = ds; 
         ds = ds->next;
@@ -339,8 +337,7 @@ int deleterule(int idx)
      return(0); 
    }
 
-  save_flags(flags);
-  cli();
+  spin_lock_irqsave(&divert_lock, flags);
   ds = table_head;
 
   while ((ds) && (idx > 0))
@@ -349,7 +346,8 @@ int deleterule(int idx)
    }
 
   if (!ds) 
-   { restore_flags(flags);
+   {
+     spin_unlock_irqrestore(&divert_lock, flags);
      return(-EINVAL);
    }  
 
@@ -363,7 +361,7 @@ int deleterule(int idx)
    else
      table_head = ds->next; /* start of chain */      
   
-  restore_flags(flags);
+  spin_unlock_irqrestore(&divert_lock, flags);
   kfree(ds);
   return(0);
 } /* deleterule */
@@ -391,6 +389,7 @@ divert_rule *getruleptr(int idx)
 int isdn_divert_icall(isdn_ctrl *ic)
 { int retval = 0;
   unsigned long flags;
+  spinlock_t divert_lock = SPIN_LOCK_UNLOCKED;
   struct call_struc *cs = NULL; 
   struct deflect_struc *dv;
   char *p,*p1;
@@ -474,10 +473,9 @@ int isdn_divert_icall(isdn_ctrl *ic)
             else  
               cs->timer.expires = 0;
            cs->akt_state = dv->rule.action;                
-           save_flags(flags);
-           cli();
+           spin_lock_irqsave(&divert_lock, flags);
            cs->divert_id = next_id++; /* new sequence number */
-           restore_flags(flags);
+           spin_unlock_irqrestore(&divert_lock, flags);
            cs->prev = NULL;
            if (cs->akt_state == DEFLECT_ALERT)
              { strcpy(cs->deflect_dest,dv->rule.to_nr);
@@ -525,12 +523,11 @@ int isdn_divert_icall(isdn_ctrl *ic)
 
   if (cs) 
    { cs->prev = NULL;
-     save_flags(flags);
-     cli();
+     spin_lock_irqsave(&divert_lock, flags);
      cs->next = divert_head;
      divert_head = cs; 
      if (cs->timer.expires) add_timer(&cs->timer);
-     restore_flags(flags);
+     spin_unlock_irqrestore(&divert_lock, flags);
 
      put_info_buffer(cs->info); 
      return(retval);
@@ -543,9 +540,9 @@ int isdn_divert_icall(isdn_ctrl *ic)
 void deleteprocs(void)
 { struct call_struc *cs, *cs1; 
   unsigned long flags;
+  spinlock_t divert_lock = SPIN_LOCK_UNLOCKED;
 
-  save_flags(flags);
-  cli();
+  spin_lock_irqsave(&divert_lock, flags);
   cs = divert_head;
   divert_head = NULL;
   while (cs)
@@ -554,7 +551,7 @@ void deleteprocs(void)
      cs = cs->next;
      kfree(cs1);
    } 
-  restore_flags(flags);
+  spin_unlock_irqrestore(&divert_lock, flags);
 } /* deleteprocs */
 
 /****************************************************/
@@ -701,6 +698,7 @@ int prot_stat_callback(isdn_ctrl *ic)
 { struct call_struc *cs, *cs1;
   int i;
   unsigned long flags;
+  spinlock_t divert_lock = SPIN_LOCK_UNLOCKED;
 
   cs = divert_head; /* start of list */
   cs1 = NULL;
@@ -769,8 +767,8 @@ int prot_stat_callback(isdn_ctrl *ic)
    }  
 
   if (cs1->ics.driver == -1)
-   { save_flags(flags);
-     cli();
+   {
+     spin_lock_irqsave(&divert_lock, flags);
      del_timer(&cs1->timer);
      if (cs1->prev) 
        cs1->prev->next = cs1->next; /* forward link */
@@ -778,7 +776,7 @@ int prot_stat_callback(isdn_ctrl *ic)
        divert_head = cs1->next;
      if (cs1->next)
        cs1->next->prev = cs1->prev; /* back link */           
-     restore_flags(flags); 
+     spin_unlock_irqrestore(&divert_lock, flags);
      kfree(cs1);
    } 
 
@@ -792,6 +790,7 @@ int prot_stat_callback(isdn_ctrl *ic)
 int isdn_divert_stat_callback(isdn_ctrl *ic)
 { struct call_struc *cs, *cs1;
   unsigned long flags;
+  spinlock_t divert_lock = SPIN_LOCK_UNLOCKED;
   int retval;
 
   retval = -1;
@@ -826,15 +825,14 @@ int isdn_divert_stat_callback(isdn_ctrl *ic)
         cs = cs->next;
         if (cs1->ics.driver == -1)
           { 
-            save_flags(flags);
-            cli();
+            spin_lock_irqsave(&divert_lock, flags);
             if (cs1->prev) 
               cs1->prev->next = cs1->next; /* forward link */
             else
               divert_head = cs1->next;
             if (cs1->next)
               cs1->next->prev = cs1->prev; /* back link */           
-            restore_flags(flags); 
+            spin_unlock_irqrestore(&divert_lock, flags);
             kfree(cs1);
           } 
       }  

drivers/isdn/i4l/Kconfig

@@ -99,7 +99,7 @@ config ISDN_DRV_LOOP
 
 config ISDN_DIVERSION
 	tristate "Support isdn diversion services"
-	depends on BROKEN && BROKEN_ON_SMP
+	depends on ISDN && ISDN_I4L
 	help
 	  This option allows you to use some supplementary diversion
 	  services in conjunction with the HiSax driver on an EURO/DSS1