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

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Date:   Thu, 13 Apr 2017 15:16:19 +0000
From:   Bart Van Assche <Bart.VanAssche@...disk.com>
To:     "jejb@...ux.vnet.ibm.com" <jejb@...ux.vnet.ibm.com>,
        "jthumshirn@...e.de" <jthumshirn@...e.de>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>
CC:     "hch@....de" <hch@....de>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "hare@...e.de" <hare@...e.de>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH v2] scsi: return correct blkprep status code in case
 scsi_init_io() fails.

On Wed, 2017-04-12 at 09:21 +0200, 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.

Reviewed-by: Bart Van Assche <bart.vanassche@...disk.com>