src/patches/suse-2.6.27.31/patches.drivers/ibmvfc-add_sync.patch

   1 Subject: Fix errors due to inconsistent command data
   2 From: Brian J. King <brking@us.ibm.com>
   3 References: 456654 - LTC50451
   4
   5 In order to ensure the VIOS sees a consistent command buffer, we
   6 need to add a memory barrier after building the command buffer
   7 but before sending the command.
   8
   9 Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
  10 Signed-off-by: Olaf Hering <olh@suse.de>
  11 ---
  12
  13  drivers/scsi/ibmvscsi/ibmvfc.c |    2 ++
  14  1 file changed, 2 insertions(+)
  15
  16 --- a/drivers/scsi/ibmvscsi/ibmvfc.c
  17 +++ b/drivers/scsi/ibmvscsi/ibmvfc.c
  18 @@ -1381,6 +1381,8 @@ static int ibmvfc_send_event(struct ibmv
  19                 add_timer(&evt->timer);
  20         }
  21
  22 +       mb();
  23 +
  24         if ((rc = ibmvfc_send_crq(vhost, crq_as_u64[0], crq_as_u64[1]))) {
  25                 list_del(&evt->queue);
  26                 del_timer(&evt->timer);