cciss: decode unit attention in SCSI error handling code

Make SCSI reset error handler decode unit attention ASC
and after a target reset wait for a unit attention that indicates
a reset occurred rather than just for any old unit attention.

Signed-off-by: Stephen M. Cameron <scameron@beardog.cca.cpqcorp.net>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 16 insertions, 7 deletions

diff --git a/drivers/block/cciss_scsi.c b/drivers/block/cciss_scsi.c
index d2eb48977410..3315268b4ec7 100644
--- a/drivers/block/cciss_scsi.c
+++ b/drivers/block/cciss_scsi.c
@@ -1604,16 +1604,25 @@ static int wait_for_device_to_become_ready(ctlr_info_t *h,
 
                 (void) process_sendcmd_error(h, c);
 
-                if (rc == 0 && c->err_info->CommandStatus == CMD_SUCCESS)
-                        break;
+                if (rc != 0)
+                        goto retry_tur;
 
-                if (rc == 0 &&
-                        c->err_info->CommandStatus == CMD_TARGET_STATUS &&
-                        c->err_info->ScsiStatus == SAM_STAT_CHECK_CONDITION &&
-                        (c->err_info->SenseInfo[2] == NO_SENSE ||
-                        c->err_info->SenseInfo[2] == UNIT_ATTENTION))
+                if (c->err_info->CommandStatus == CMD_SUCCESS)
                         break;
 
+                if (c->err_info->CommandStatus == CMD_TARGET_STATUS &&
+                        c->err_info->ScsiStatus == SAM_STAT_CHECK_CONDITION) {
+                        if (c->err_info->SenseInfo[2] == NO_SENSE)
+                                break;
+                        if (c->err_info->SenseInfo[2] == UNIT_ATTENTION) {
+                                unsigned char asc;
+                                asc = c->err_info->SenseInfo[12];
+                                check_for_unit_attention(h, c);
+                                if (asc == POWER_OR_RESET)
+                                        break;
+                        }
+                }
+retry_tur:
                 printk(KERN_WARNING "cciss%d: Waiting %d secs "
                         "for device to become ready.\n",
                         h->ctlr, waittime / HZ);