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storvsc: ring buffer failures 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@microsoft.com>
Reviewed-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
cc: stable@vger.kernel.org
This commit is contained in:
Long Li 2014-12-05 19:38:18 -08:00 committed by Christoph Hellwig
parent 60654e250c
commit e86fb5e8ab
1 changed files with 3 additions and 4 deletions
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7
drivers/scsi/storvsc_drv.c
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@ -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;