scsi: mpt: Remove deprecated create_singlethread_workqueue

The workqueues "ioc->reset_work_q" and "ioc->fw_event_q" queue a single
work item &ioc->fault_reset_work and &fw_event->work, respectively and
hence don't require ordering. Hence, they have been converted to use
alloc_workqueue().

The WQ_MEM_RECLAIM flag has been set to ensure forward progress under
memory pressure since the workqueue belongs to a storage driver which is
being used on a memory reclaim path.

Since there are fixed number of work items, explicit concurrency limit
is unnecessary here.

Signed-off-by: Bhaktipriya Shridhar <bhaktipriya96@gmail.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/message/fusion/mptbase.c

@@ -1865,8 +1865,8 @@ mpt_attach(struct pci_dev *pdev, const struct pci_device_id *id)
 
 	snprintf(ioc->reset_work_q_name, MPT_KOBJ_NAME_LEN,
 		 "mpt_poll_%d", ioc->id);
-	ioc->reset_work_q =
-		create_singlethread_workqueue(ioc->reset_work_q_name);
+	ioc->reset_work_q = alloc_workqueue(ioc->reset_work_q_name,
+					    WQ_MEM_RECLAIM, 0);
 	if (!ioc->reset_work_q) {
 		printk(MYIOC_s_ERR_FMT "Insufficient memory to add adapter!\n",
 		    ioc->name);
@@ -1992,7 +1992,8 @@ mpt_attach(struct pci_dev *pdev, const struct pci_device_id *id)
 	INIT_LIST_HEAD(&ioc->fw_event_list);
 	spin_lock_init(&ioc->fw_event_lock);
 	snprintf(ioc->fw_event_q_name, MPT_KOBJ_NAME_LEN, "mpt/%d", ioc->id);
-	ioc->fw_event_q = create_singlethread_workqueue(ioc->fw_event_q_name);
+	ioc->fw_event_q = alloc_workqueue(ioc->fw_event_q_name,
+					  WQ_MEM_RECLAIM, 0);
 	if (!ioc->fw_event_q) {
 		printk(MYIOC_s_ERR_FMT "Insufficient memory to add adapter!\n",
 		    ioc->name);