Re: [ V3 PATCH 2/2] scsi: TUR path is down after adapter gets reset with multipath

[Hannes Reinecke <hare@suse.de>]

On 11/06/2014 10:11 PM, wenxiong@linux.vnet.ibm.com wrote:
> This patch fixes an issue with multipath ipr SAS devices which require a
> start unit command to be issued following an adapter reset. Without this
> patch, paths get marked failed following an adapter reset and since the
> error handler never gets invoked to issue the start unit, the paths are
> never recovered. Returning FAILED for this case ensures the error
> handler wakes up to issue the start unit.
> 
> Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
> Teste-by: Wen Xiong <wenxiong@linux.vnet.ibm.com>
> ---
>  drivers/scsi/device_handler/scsi_dh_alua.c |    7 +++++++
>  1 file changed, 7 insertions(+)
> 
> Index: b/drivers/scsi/device_handler/scsi_dh_alua.c
> ===================================================================
> --- a/drivers/scsi/device_handler/scsi_dh_alua.c	2014-11-06 14:01:37.682079047 -0600
> +++ b/drivers/scsi/device_handler/scsi_dh_alua.c	2014-11-06 14:04:08.772079175 -0600
> @@ -474,6 +474,13 @@ static int alua_check_sense(struct scsi_
>  			 * LUN Not Ready -- Offline
>  			 */
>  			return SUCCESS;
> +		if (sdev->allow_restart &&
> +		    sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x02)
> +			/*
> +			 * if the device is not started, we need to wake
> +			 * the error handler to start the motor
> +			 */
> +			return FAILED;
>  		break;
>  	case UNIT_ATTENTION:
>  		if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00)
> 
Reviewed-by: Hannes Reinecke <hare@suse.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		      zSeries & Storage
hare@suse.de			      +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: J. Hawn, J. Guild, F. Imendörffer, HRB 21284 (AG Nürnberg)
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