[SCSI] hpsa: fix handling of protocol error

If a command status of CMD_PROTOCOL_ERR is received, this
information should be conveyed to the SCSI mid layer, not
dropped on the floor.  CMD_PROTOCOL_ERR may be received
from the Smart Array for any commands destined for an external
RAID controller such as a P2000, or commands destined for tape
drives or CD/DVD-ROM drives, if for instance a cable is
disconnected.  This mostly affects multipath configurations, as
disconnecting a cable on a non-multipath configuration is not
going to do anything good regardless of whether CMD_PROTOCOL_ERR
is handled correctly or not.  Not handling CMD_PROTOCOL_ERR
correctly in a multipath configaration involving external RAID
controllers may cause data corruption, so this is quite a serious
bug.  This bug should not normally cause a problem for direct
attached disk storage.

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Cc: stable@vger.kernel.org
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index 796482badf13acfe91f4391822d90cd6339d9ffc..2b4261cb77424b52046d6e4c255f32f3359bbf2a 100644 (file)
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -1315,8 +1315,9 @@ static void complete_scsi_command(struct CommandList *cp)
        }
                break;
        case CMD_PROTOCOL_ERR:
+               cmd->result = DID_ERROR << 16;
                dev_warn(&h->pdev->dev, "cp %p has "
-                       "protocol error \n", cp);
+                       "protocol error\n", cp);
                break;
        case CMD_HARDWARE_ERR:
                cmd->result = DID_ERROR << 16;