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

[Malahal Naineni]

Chauhan, Vijay [Vijay.Chauhan at lsi.com] wrote:
> 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;

The code looks fine.  Is this ASC/ASCQ code specific to RDAC devices? If
not, how about changing the scsi_error.c itself?

Thanks, Malahal.