| From | Greg Kroah-Hartman <> | Subject | [PATCH 3.18 099/183] storvsc: ring buffer failures may result in I/O freeze | Date | Sun, 25 Jan 2015 10:07:01 -0800 |
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3.18-stable review patch. If anyone has any objections, please let me know.
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From: Long Li <longli@microsoft.com>
commit e86fb5e8ab95f10ec5f2e9430119d5d35020c951 upstream.
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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/scsi/storvsc_drv.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-)
--- a/drivers/scsi/storvsc_drv.c +++ b/drivers/scsi/storvsc_drv.c @@ -1688,13 +1688,12 @@ static int storvsc_queuecommand(struct S 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;
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