[PATCH] [scsi]: Add offline state checking while dispatch a scsi cmd

[Joe Jin <joe.jin@oracle.com>]

While a scsi device hw error occured, device's status maybe setting 
to SDEV_OFFLINE, So at scsi_dispatch_cmd function, we should checking
if device have offline, if yes, do nothing and just return error to
user directly.


Signed-off-by: Joe Jin <lkmaillist@gmail.com>
--
--- linux-2.6.21-rc2/drivers/scsi/scsi.c.orig	2007-03-08 16:50:14.000000000 +0800
+++ linux-2.6.21-rc2/drivers/scsi/scsi.c	2007-03-08 16:52:45.000000000 +0800
@@ -486,10 +486,12 @@
 	int rtn = 0;
 
 	/* check if the device is still usable */
-	if (unlikely(cmd->device->sdev_state == SDEV_DEL)) {
-		/* in SDEV_DEL we error all commands. DID_NO_CONNECT
-		 * returns an immediate error upwards, and signals
-		 * that the device is no longer present */
+	if (unlikely(cmd->device->sdev_state == SDEV_DEL || 
+		     cmd->device->sdev_state == SDEV_OFFLINE)) {
+		/* in SDEV_DEL or SDEV_OFFLINE we error all commands. 
+		 * DID_NO_CONNECT returns an immediate error upwards,
+		 * and signals that the device is no longer present 
+		 */
 		cmd->result = DID_NO_CONNECT << 16;
 		atomic_inc(&cmd->device->iorequest_cnt);
 		__scsi_done(cmd);