The patch below does not apply to the 4.9-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 <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From be549d49115422f846b6d96ee8fd7173a5f7ceb0 Mon Sep 17 00:00:00 2001
From: Jaesoo Lee <jalee@xxxxxxxxxxxxxxx>
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.
Fixes: d285203cf647 ("scsi: add support for a blk-mq based I/O path.")
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Jaesoo Lee <jalee@xxxxxxxxxxxxxxx>
Reviewed-by: Hannes Reinecke <hare@xxxxxxxx>
Reviewed-by: Bart Van Assche <bvanassche@xxxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 601b9f1de267..07dfc17d4824 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -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.
*/
