[dm-devel] Re: [PATCH]scsi_dh_rdac: Retry mode select for NO_SENSE, ABORTED_COMMAND, UNIT_ATTENTION, NOT_READY(02/04/01)

[Hannes Reinecke]

Hi Vijay,

Chauhan, Vijay wrote:
> This patch is to add retry for mode select if mode select command is returned with sense key NO_SENSE, 
> ABORTED_COMMAND, UNIT_ATTENTION or NOT_READY(02/04/01). This patch reorganise the sense from 
> if-else to switch-case format in scsi_dh_rdac.c for better maintainability.
> 
> Signed-off-by: Vijay Chauhan <vijay.chauhan at lsi.com>
> ---
> 
> --- linux-2.6.29-rc5/drivers/scsi/device_handler/scsi_dh_rdac.c.orig	2009-02-24 12:08:43.000000000 +0530
> +++ linux-2.6.29-rc5/drivers/scsi/device_handler/scsi_dh_rdac.c	2009-02-28 18:18:41.000000000 +0530
> @@ -449,28 +449,40 @@ static int mode_select_handle_sense(stru
>  				    unsigned char *sensebuf)
>  {
>  	struct scsi_sense_hdr sense_hdr;
> -	int sense, err = SCSI_DH_IO, ret;
> +	int err = SCSI_DH_IO, ret;
>  
>  	ret = scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, &sense_hdr);
>  	if (!ret)
>  		goto done;
>  
>  	err = SCSI_DH_OK;
> -	sense = (sense_hdr.sense_key << 16) | (sense_hdr.asc << 8) |
> -			sense_hdr.ascq;
> -	/* If it is retryable failure, submit the c9 inquiry again */
> -	if (sense == 0x59136 || sense == 0x68b02 || sense == 0xb8b02 ||
> -			    sense == 0x62900) {
> -		/* 0x59136    - Command lock contention
> -		 * 0x[6b]8b02 - Quiesense in progress or achieved
> -		 * 0x62900    - Power On, Reset, or Bus Device Reset
> -		 */
> +
> +	switch (sense_hdr.sense_key) {
> +	case NO_SENSE:
> +	case ABORTED_COMMAND:
> +	case UNIT_ATTENTION:
> +		err = SCSI_DH_RETRY;
> +		break;
> +	case NOT_READY:
> +		if (sense_hdr.asc == 0x04 && sense_hdr.ascq == 0x01)
> +			/* LUN Not Ready and is in the Process
> +			 * of becoming ready
> +			 */
> +		err = SCSI_DH_RETRY;
Missing indentation.

What about the other 'in progress' ASC/ASQ codes (ie 04/04 - 04/09) ?
Can they safely be ignored as the array will not issue them?

> +		break;
> +	case ILLEGAL_REQUEST:
> +		if (sense_hdr.asc == 0x91 && sense_hdr.ascq == 0x36)
> +			/*
> +			 * Command Lock contention
> +			 */
>  		err = SCSI_DH_RETRY;
Again, missing indentation.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		      zSeries & Storage
hare at suse.de			      +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
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