[SCSI] gdth: fix timer handling

The global timer handling is problematic in that if someone unbinds a
PCI gdth instance, the BUG_ON() in the timer will cause a panic.

Fix this by making the timer start and stop depending on whether there
are instances present. This should also permit binding and unbinding
to work.

Signed-off-by: James Bottomley <[e-mail]>

drivers/scsi/gdth.c

···
 }
 
 #ifdef GDTH_STATISTICS
+static unchar	gdth_timer_running;
+
 static void gdth_timeout(ulong data)
 {
     ulong32 i;
···
     gdth_ha_str *ha;
     ulong flags;
 
-    BUG_ON(list_empty(&gdth_instances));
+    if(unlikely(list_empty(&gdth_instances))) {
+	    gdth_timer_running = 0;
+	    return;
+    }
 
     ha = list_first_entry(&gdth_instances, gdth_ha_str, list);
     spin_lock_irqsave(&ha->smp_lock, flags);
···
     gdth_timer.expires = jiffies + 30 * HZ;
     add_timer(&gdth_timer);
     spin_unlock_irqrestore(&ha->smp_lock, flags);
+}
+
+static void gdth_timer_init(void)
+{
+	if (gdth_timer_running)
+		return;
+	gdth_timer_running = 1;
+	TRACE2(("gdth_detect(): Initializing timer !\n"));
+	gdth_timer.expires = jiffies + HZ;
+	gdth_timer.data = 0L;
+	gdth_timer.function = gdth_timeout;
+	add_timer(&gdth_timer);
+}
+#else
+static inline void gdth_timer_init(void)
+{
 }
 #endif
 
···
 	if (error)
 		goto out_free_coal_stat;
 	list_add_tail(&ha->list, &gdth_instances);
+	gdth_timer_init();
 
 	scsi_scan_host(shp);
 
···
 	if (error)
 		goto out_free_coal_stat;
 	list_add_tail(&ha->list, &gdth_instances);
+	gdth_timer_init();
 
 	scsi_scan_host(shp);
 
···
 	list_add_tail(&ha->list, &gdth_instances);
 
 	pci_set_drvdata(ha->pdev, ha);
+	gdth_timer_init();
 
 	scsi_scan_host(shp);
 
···
 	/* initializations */
 	gdth_polling = TRUE;
 	gdth_clear_events();
+	init_timer(&gdth_timer);
 
 	/* As default we do not probe for EISA or ISA controllers */
 	if (probe_eisa_isa) {
···
 
 	TRACE2(("gdth_detect() %d controller detected\n", gdth_ctr_count));
 
-	if (list_empty(&gdth_instances))
-		return -ENODEV;
-
-#ifdef GDTH_STATISTICS
-	TRACE2(("gdth_detect(): Initializing timer !\n"));
-	init_timer(&gdth_timer);
-	gdth_timer.expires = jiffies + HZ;
-	gdth_timer.data = 0L;
-	gdth_timer.function = gdth_timeout;
-	add_timer(&gdth_timer);
-#endif
 	major = register_chrdev(0,"gdth", &gdth_fops);
 	register_reboot_notifier(&gdth_notifier);
 	gdth_polling = FALSE;