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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1400289

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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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:
  Confirmed

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 <longli@xxxxxxxxxxxxx>
  Reviewed-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
  ---
   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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