[PATCH] scsi: return TARGET_ERROR when a device has been disconnected

[Hannes Reinecke <hare@suse.de>]

When we receive a sense code of
NOT READY, LOGICAL UNIT NOT SUPPORTED
the device has been disconnected and any retry on other paths
would be pointless. So return TARGET_ERROR here.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Cc: James Bottomley <jbottomley@parallels.com>
---
 drivers/scsi/scsi_error.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index de2337f..0fe639e 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -296,6 +296,10 @@ static int scsi_check_sense(struct scsi_cmnd *scmd)
 
 		return NEEDS_RETRY;
 	case NOT_READY:
+		if ((sshdr.asc == 0x25) && (sshdr.ascq == 0)) {
+			/* Logical unit not supported */
+			return TARGET_ERROR;
+		}
 	case UNIT_ATTENTION:
 		/*
 		 * if we are expecting a cc/ua because of a bus reset that we
-- 
1.7.4.2