linux-kernel - drivers:scsi:storvsc: Fix a bug in handling ring buffer failures that may result in I/O freeze

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Message-Id: <1417837098-23815-1-git-send-email-longli@microsoft.com>
Date:	Fri,  5 Dec 2014 19:38:18 -0800
From:	Long Li <longli@...rosoft.com>
To:	linux-scsi@...r.kernel.org
Cc:	kys@...rosoft.com, haiyangz@...rosoft.com,
	JBottomley@...allels.com, devel@...uxdriverproject.org,
	linux-kernel@...r.kernel.org, Long Li <longli@...rosoft.com>
Subject: drivers:scsi:storvsc: Fix a bug in handling ring buffer failures that may result in I/O freeze

When ring buffer returns an error indicating retry, storvsc may not return a proper error code to SCSI when bounce buffer is not used. This has introduced I/O freeze on RAID running atop storvsc devices. This patch fixes it by always returning a proper error code.

Signed-off-by: Long Li <longli@...rosoft.com>
Reviewed-by: K. Y. Srinivasan <kys@...rosoft.com>
---
 drivers/scsi/storvsc_drv.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index e3ba251..4cff0dd 100644
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -1688,13 +1688,12 @@ static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
 	if (ret == -EAGAIN) {
 		/* no more space */
 
-		if (cmd_request->bounce_sgl_count) {
+		if (cmd_request->bounce_sgl_count)
 			destroy_bounce_buffer(cmd_request->bounce_sgl,
 					cmd_request->bounce_sgl_count);
 
-			ret = SCSI_MLQUEUE_DEVICE_BUSY;
-			goto queue_error;
-		}
+		ret = SCSI_MLQUEUE_DEVICE_BUSY;
+		goto queue_error;
 	}
 
 	return 0;
-- 
2.1.0

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