FAILED: patch "[PATCH] scsi: core: set result when the command cannot be dispatched" failed to apply to 4.4-stable tree

The patch below does not apply to the 4.4-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From be549d49115422f846b6d96ee8fd7173a5f7ceb0 Mon Sep 17 00:00:00 2001
From: Jaesoo Lee <[email protected]>
Date: Tue, 9 Apr 2019 17:02:22 -0700
Subject: [PATCH] scsi: core: set result when the command cannot be dispatched

When SCSI blk-mq is enabled, there is a bug in handling errors in scsi_queue_rq. Specifically, the bug is not setting result field of scsi_request correctly when the dispatch of the command has been failed. Since the upper layer code including the sg_io ioctl expects to receive any error status from result field of scsi_request, the error is silently ignored and this could cause data corruptions for some applications.

index 601b9f1de267..07dfc17d4824 100644
@@ -1706,8 +1706,12 @@ static blk_status_t scsi_queue_rq(struct blk_mq_hw_ctx *hctx,
 			ret = BLK_STS_DEV_RESOURCE;
 		break;
 	default:
+		if (unlikely(!scsi_device_online(sdev)))
+			scsi_req(req)->result = DID_NO_CONNECT << 16;
+		else
+			scsi_req(req)->result = DID_ERROR << 16;
 		/*
-		 * Make sure to release all allocated ressources when
+		 * Make sure to release all allocated resources when
 		 * we hit an error, as we will never see this command
 		 * again.
 		 */