[dm-devel] [RESUBMIT][Patch] scsi_dh_rdac: retry IO for 06/3f/03 in rdac_check_sense fn

[Chauhan, Vijay]

Resubmitting this patch to get the attention.

This patch adds retry for the IO returned with 06/3f/03((INQUIRY_DATA_CHANGED)) sense code  in rdac_check_sense(). IO returned with 06/3f/03 from controller are currently failed by scsi mid layer, as a reason momentarily path failure is noticed by DM multipath. 

Signed-off-by: Vijay Chauhan<vijay.chauhan at lsi.com>
Reviewed-by: Babu Moger <babu.moger at lsi.com>
Reviewed-by: Bob Stankey <Robert.stankey at lsi.com>
---

diff -uprN linux-2.6.35-rc6-orig/drivers/scsi/device_handler/scsi_dh_rdac.c linux-2.6.35-rc6/drivers/scsi/device_handler/scsi_dh_rdac.c
--- linux-2.6.35-rc6-orig/drivers/scsi/device_handler/scsi_dh_rdac.c	2010-07-22 15:13:38.000000000 -0400
+++ linux-2.6.35-rc6/drivers/scsi/device_handler/scsi_dh_rdac.c	2010-07-27 12:13:58.000000000 -0400
@@ -738,6 +738,11 @@ static int rdac_check_sense(struct scsi_
 			 * Quiescence in progress , just retry.
 			 */
 			return ADD_TO_MLQUEUE;
+		if (sense_hdr->asc == 0x3f && sense_hdr->ascq == 0x03)
+			/*
+			 * INQUIRY DATA has changed, retry again.
+			 */
+			return ADD_TO_MLQUEUE;
 		break;
 	}
 	/* success just means we do not care what scsi-ml does */

--