linux-kernel - Re: [PATCH v2] scsi: return correct blkprep status code in case scsi_init

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Date:   Wed, 12 Apr 2017 09:27:52 +0200
From:   Hannes Reinecke <hare@...e.de>
To:     Johannes Thumshirn <jthumshirn@...e.de>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        James Bottomley <jejb@...ux.vnet.ibm.com>
Cc:     Christoph Hellwig <hch@....de>,
        Bart Van Assche <Bart.VanAssche@...disk.com>,
        Linux SCSI Mailinglist <linux-scsi@...r.kernel.org>,
        Linux Kernel Mailinglist <linux-kernel@...r.kernel.org>,
        stable@...r.kernel.org
Subject: Re: [PATCH v2] scsi: return correct blkprep status code in case
 scsi_init_io() fails.

On 04/12/2017 09:21 AM, Johannes Thumshirn wrote:
> When instrumenting the SCSI layer to run into the
> !blk_rq_nr_phys_segments(rq) case the following  warning emitted from the
> block layer:
> 
> blk_peek_request: bad return=-22
> 
> This happens because since commit fd3fc0b4d730 ('scsi: don't BUG_ON()
> empty DMA transfers') we return the wrong error value from scsi_prep_fn()
> back to the block layer.
> 
> Signed-off-by: Johannes Thumshirn <jthumshirn@...e.de>
> Fixes: fd3fc0b4d730 scsi: don't BUG_ON() empty DMA transfers
> Cc: <stable@...r.kernel.org>
> Reviewed-by: Christoph Hellwig <hch@....de>
> ---
> Changes to v1:
> * s/iscsi_prep_fn()/scsi_prep_fn()
> * Add Cc stable
> 
>  drivers/scsi/scsi_lib.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
> index 19125d72f322..5558e212368b 100644
> --- a/drivers/scsi/scsi_lib.c
> +++ b/drivers/scsi/scsi_lib.c
> @@ -1061,10 +1061,10 @@ int scsi_init_io(struct scsi_cmnd *cmd)
>  	struct scsi_device *sdev = cmd->device;
>  	struct request *rq = cmd->request;
>  	bool is_mq = (rq->mq_ctx != NULL);
> -	int error;
> +	int error = BLKPREP_KILL;
>  
>  	if (WARN_ON_ONCE(!blk_rq_nr_phys_segments(rq)))
> -		return -EINVAL;
> +		goto err_exit;
>  
>  	error = scsi_init_sgtable(rq, &cmd->sdb);
>  	if (error)
> 
Reviewed-by: Hannes Reinecke <hare@...e.com>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		   Teamlead Storage & Networking
hare@...e.de			               +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
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