[SCSI] libiscsi: Do not fail commands immediately during logout

If the target requests a logout, then we do not want
to fail commands to scsi-ml right away. This patch just
fails in pending commands for a requeue immediately, and then lets
iscsid handle running commands like normal recovery.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

drivers/scsi/libiscsi.c

@@ -917,7 +917,7 @@ check_mgmt:
 		conn->ctask = list_entry(conn->xmitqueue.next,
 					 struct iscsi_cmd_task, running);
 		if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
-			fail_command(conn, conn->ctask, DID_NO_CONNECT << 16);
+			fail_command(conn, conn->ctask, DID_IMM_RETRY << 16);
 			continue;
 		}
 		if (iscsi_prep_scsi_cmd_pdu(conn->ctask)) {
@@ -1024,21 +1024,19 @@ int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
 		 * be entering our queuecommand while a block is starting
 		 * up because the block code is not locked)
 		 */
-		if (session->state == ISCSI_STATE_IN_RECOVERY) {
+		switch (session->state) {
+		case ISCSI_STATE_IN_RECOVERY:
 			reason = FAILURE_SESSION_IN_RECOVERY;
 			goto reject;
-		}
-
-		switch (session->state) {
+		case ISCSI_STATE_LOGGING_OUT:
+			reason = FAILURE_SESSION_LOGGING_OUT;
+			goto reject;
 		case ISCSI_STATE_RECOVERY_FAILED:
 			reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
 			break;
 		case ISCSI_STATE_TERMINATE:
 			reason = FAILURE_SESSION_TERMINATE;
 			break;
-		case ISCSI_STATE_LOGGING_OUT:
-			reason = FAILURE_SESSION_LOGGING_OUT;
-			break;
 		default:
 			reason = FAILURE_SESSION_FREED;
 		}