Re: [patch] scsi_dh_hp_sw.c: return DEV_OFFLINED when blk_get_request fails

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On Thu, 28 Mar 2013 15:32:12 -0400
Jeff Moyer <jmoyer@xxxxxxxxxx> wrote:

> Hi,
> 
> If blk_get_requet fails here, it means that the queue is dead.  It
> seems better to return a DEV_OFFLINED error code than the misleading
> TEMP_UNAVAIL.  Comments?
> 
> Signed-off-by: Jeff Moyer <jmoyer@xxxxxxxxxx>
> 
> diff --git a/drivers/scsi/device_handler/scsi_dh_hp_sw.c
> b/drivers/scsi/device_handler/scsi_dh_hp_sw.c index 084062b..eec24d3
> 100644 --- a/drivers/scsi/device_handler/scsi_dh_hp_sw.c
> +++ b/drivers/scsi/device_handler/scsi_dh_hp_sw.c
> @@ -118,7 +118,7 @@ static int hp_sw_tur(struct scsi_device *sdev,
> struct hp_sw_dh_data *h) retry:
>  	req = blk_get_request(sdev->request_queue, WRITE, GFP_NOIO);
>  	if (!req)
> -		return SCSI_DH_RES_TEMP_UNAVAIL;
> +		return SCSI_DH_DEV_OFFLINED;
>  
>  	req->cmd_type = REQ_TYPE_BLOCK_PC;
>  	req->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |

Hi Jeff,

How about hp_sw_start_stop?  It calls blk_get_request with GFP_ATOMIC,
so it might see !req for dead queue or no memory.

-- Joe
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