Re: [PATCH v2] scsi: return correct blkprep status code in case scsi_init_io() fails.

[Bart Van Assche]

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@xxxxxxxxxxx>