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-   -   scsi_dh_rdac: retry IO for 06/3f/03 in rdac_check_sense fn (http://www.linux-archive.org/device-mapper-development/407305-scsi_dh_rdac-retry-io-06-3f-03-rdac_check_sense-fn.html)

"Chauhan, Vijay" 08-02-2010 07:37 AM

scsi_dh_rdac: retry IO for 06/3f/03 in rdac_check_sense fn
 
Hi,

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;
break;
}
/* success just means we do not care what scsi-ml does */

--

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