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


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 lsi com>
Reviewed-by: Babu Moger <babu moger lsi com>
Reviewed-by: Bob Stankey <Robert stankey 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;
 	/* success just means we do not care what scsi-ml does */


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