** Branch linked: lp:ubuntu/trusty-proposed/linux-keystone
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https://bugs.launchpad.net/bugs/1400289
Title:
Hyper-V: drivers:scsi:storvsc: Fix a bug in handling ring buffer
failures that may result in I/O freeze
Status in linux package in Ubuntu:
Fix Committed
Status in linux source package in Precise:
Fix Committed
Status in linux source package in Trusty:
Fix Committed
Status in linux source package in Utopic:
Fix Committed
Status in linux source package in Vivid:
Fix Committed
Bug description:
As requested by Microsoft.
===
Andy,
Could you pick up this patch. Customers are hitting this issue on
Azure (on Canonical images).
Regards,
K. Y
===
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 <lon...@microsoft.com>
Reviewed-by: K. Y. Srinivasan <k...@microsoft.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;
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