CIFS: SMBD: Do not call ib_dereg_mr on invalidated memory registration

It is not necessary to deregister a memory registration after it has been
successfully invalidated.
Signed-off-by: Long Li <longli@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

fs/cifs/smbdirect.c

@@ -2295,8 +2295,12 @@ static void smbd_mr_recovery_work(struct work_struct *work)
 	int rc;
 
 	list_for_each_entry(smbdirect_mr, &info->mr_list, list) {
-		if (smbdirect_mr->state == MR_INVALIDATED ||
-			smbdirect_mr->state == MR_ERROR) {
+		if (smbdirect_mr->state == MR_INVALIDATED)
+			ib_dma_unmap_sg(
+				info->id->device, smbdirect_mr->sgl,
+				smbdirect_mr->sgl_count,
+				smbdirect_mr->dir);
+		else if (smbdirect_mr->state == MR_ERROR) {
 
 			/* recover this MR entry */
 			rc = ib_dereg_mr(smbdirect_mr->mr);
@@ -2320,12 +2324,9 @@ static void smbd_mr_recovery_work(struct work_struct *work)
 				smbd_disconnect_rdma_connection(info);
 				continue;
 			}
-
-			if (smbdirect_mr->state == MR_INVALIDATED)
-				ib_dma_unmap_sg(
-					info->id->device, smbdirect_mr->sgl,
-					smbdirect_mr->sgl_count,
-					smbdirect_mr->dir);
+		} else
+			/* This MR is being used, don't recover it */
+			continue;
 
 		smbdirect_mr->state = MR_READY;
 
@@ -2339,7 +2340,6 @@ static void smbd_mr_recovery_work(struct work_struct *work)
 		if (atomic_inc_return(&info->mr_ready_count) == 1)
 			wake_up_interruptible(&info->wait_mr);
 	}
-	}
 }
 
 static void destroy_mr_list(struct smbd_connection *info)