[SCSI] mpt2sas: fix crash due to Watchdog is active while OS in standby mode

Fix oops ocurring at hibernation time.  This oops was due to the firmware fault
watchdog timer still running after we freed resources. To fix the issue we need
to terminate the watchdog timer at hibernation time.

Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
diff --git a/drivers/scsi/mpt2sas/mpt2sas_base.c b/drivers/scsi/mpt2sas/mpt2sas_base.c
index ed9965e..c29c4f9 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_base.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_base.c
@@ -119,6 +119,64 @@
 	spin_unlock_irqrestore(&ioc->ioc_reset_in_progress_lock, flags);
 }
 
+/**
+ * mpt2sas_base_start_watchdog - start the fault_reset_work_q
+ * @ioc: pointer to scsi command object
+ * Context: sleep.
+ *
+ * Return nothing.
+ */
+void
+mpt2sas_base_start_watchdog(struct MPT2SAS_ADAPTER *ioc)
+{
+	unsigned long	 flags;
+
+	if (ioc->fault_reset_work_q)
+		return;
+
+	/* initialize fault polling */
+	INIT_DELAYED_WORK(&ioc->fault_reset_work, _base_fault_reset_work);
+	snprintf(ioc->fault_reset_work_q_name,
+	    sizeof(ioc->fault_reset_work_q_name), "poll_%d_status", ioc->id);
+	ioc->fault_reset_work_q =
+		create_singlethread_workqueue(ioc->fault_reset_work_q_name);
+	if (!ioc->fault_reset_work_q) {
+		printk(MPT2SAS_ERR_FMT "%s: failed (line=%d)\n",
+		    ioc->name, __func__, __LINE__);
+			return;
+	}
+	spin_lock_irqsave(&ioc->ioc_reset_in_progress_lock, flags);
+	if (ioc->fault_reset_work_q)
+		queue_delayed_work(ioc->fault_reset_work_q,
+		    &ioc->fault_reset_work,
+		    msecs_to_jiffies(FAULT_POLLING_INTERVAL));
+	spin_unlock_irqrestore(&ioc->ioc_reset_in_progress_lock, flags);
+}
+
+/**
+ * mpt2sas_base_stop_watchdog - stop the fault_reset_work_q
+ * @ioc: pointer to scsi command object
+ * Context: sleep.
+ *
+ * Return nothing.
+ */
+void
+mpt2sas_base_stop_watchdog(struct MPT2SAS_ADAPTER *ioc)
+{
+	unsigned long	 flags;
+	struct workqueue_struct *wq;
+
+	spin_lock_irqsave(&ioc->ioc_reset_in_progress_lock, flags);
+	wq = ioc->fault_reset_work_q;
+	ioc->fault_reset_work_q = NULL;
+	spin_unlock_irqrestore(&ioc->ioc_reset_in_progress_lock, flags);
+	if (wq) {
+		if (!cancel_delayed_work(&ioc->fault_reset_work))
+			flush_workqueue(wq);
+		destroy_workqueue(wq);
+	}
+}
+
 #ifdef CONFIG_SCSI_MPT2SAS_LOGGING
 /**
  * _base_sas_ioc_info - verbose translation of the ioc status
@@ -3209,7 +3267,6 @@
 mpt2sas_base_attach(struct MPT2SAS_ADAPTER *ioc)
 {
 	int r, i;
-	unsigned long	 flags;
 
 	dinitprintk(ioc, printk(MPT2SAS_DEBUG_FMT "%s\n", ioc->name,
 	    __func__));
@@ -3292,23 +3349,7 @@
 	if (r)
 		goto out_free_resources;
 
-	/* initialize fault polling */
-	INIT_DELAYED_WORK(&ioc->fault_reset_work, _base_fault_reset_work);
-	snprintf(ioc->fault_reset_work_q_name,
-	    sizeof(ioc->fault_reset_work_q_name), "poll_%d_status", ioc->id);
-	ioc->fault_reset_work_q =
-		create_singlethread_workqueue(ioc->fault_reset_work_q_name);
-	if (!ioc->fault_reset_work_q) {
-		printk(MPT2SAS_ERR_FMT "%s: failed (line=%d)\n",
-		    ioc->name, __func__, __LINE__);
-			goto out_free_resources;
-	}
-	spin_lock_irqsave(&ioc->ioc_reset_in_progress_lock, flags);
-	if (ioc->fault_reset_work_q)
-		queue_delayed_work(ioc->fault_reset_work_q,
-		    &ioc->fault_reset_work,
-		    msecs_to_jiffies(FAULT_POLLING_INTERVAL));
-	spin_unlock_irqrestore(&ioc->ioc_reset_in_progress_lock, flags);
+	mpt2sas_base_start_watchdog(ioc);
 	return 0;
 
  out_free_resources:
@@ -3341,20 +3382,11 @@
 void
 mpt2sas_base_detach(struct MPT2SAS_ADAPTER *ioc)
 {
-	unsigned long	 flags;
-	struct workqueue_struct *wq;
 
 	dexitprintk(ioc, printk(MPT2SAS_DEBUG_FMT "%s\n", ioc->name,
 	    __func__));
 
-	spin_lock_irqsave(&ioc->ioc_reset_in_progress_lock, flags);
-	wq = ioc->fault_reset_work_q;
-	ioc->fault_reset_work_q = NULL;
-	spin_unlock_irqrestore(&ioc->ioc_reset_in_progress_lock, flags);
-	if (!cancel_delayed_work(&ioc->fault_reset_work))
-		flush_workqueue(wq);
-	destroy_workqueue(wq);
-
+	mpt2sas_base_stop_watchdog(ioc);
 	mpt2sas_base_free_resources(ioc);
 	_base_release_memory_pools(ioc);
 	kfree(ioc->pfacts);