src/patches/suse-2.6.27.31/patches.fixes/scsi-dh-emc-rw-mismatch

   1 From: Hannes Reinecke <hare@suse.de>
   2 Subject: Server crashes when path failures occur against EMC storage
   3 Reference: bnc#474482
   4
   5 When cable pulls, SP reboots, or other events take place that would interfere
   6 with IO running to EMC storage the server crashes trying to resolve the path
   7 failure.
   8
   9 Proglem is that we're latching on MODE_SELECT when deciding the
  10 read/write mode for blk_get_request(). However, for newer arrays
  11 we're using MODE_SELECT_10, thus causing a mismatch.
  12
  13 Signed-off-by: Hannes Reinecke <hare@suse.de>
  14
  15 diff --git a/drivers/scsi/device_handler/scsi_dh_emc.c b/drivers/scsi/device_handler/scsi_dh_emc.c
  16 index 436957a..2505237 100644
  17 --- a/drivers/scsi/device_handler/scsi_dh_emc.c
  18 +++ b/drivers/scsi/device_handler/scsi_dh_emc.c
  19 @@ -272,7 +272,7 @@ static struct request *get_req(struct scsi_device *sdev, int cmd,
  20         int len = 0;
  21
  22         rq = blk_get_request(sdev->request_queue,
  23 -                       (cmd == MODE_SELECT) ? WRITE : READ, GFP_NOIO);
  24 +                       (cmd != INQUIRY) ? WRITE : READ, GFP_NOIO);
  25         if (!rq) {
  26                 sdev_printk(KERN_INFO, sdev, "get_req: blk_get_request failed");
  27                 return NULL;