On 01/13/2017 12:29 PM, Christoph Hellwig wrote:
> Without that we'll pass a wrong payload size in cmd->sdb, which
> can lead to hangs with drivers that need the total transfer size.
> 
> Signed-off-by: Christoph Hellwig <h...@lst.de>
> Reported-by: Chris Valean <v-chv...@microsoft.com>
> Reported-by: Dexuan Cui <de...@microsoft.com>
> Fixes: f9d03f96 ("block: improve handling of the magic discard payload")
> ---
>  drivers/scsi/scsi_lib.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
> index c35b6de..ad4ff8f 100644
> --- a/drivers/scsi/scsi_lib.c
> +++ b/drivers/scsi/scsi_lib.c
> @@ -1018,7 +1018,7 @@ static int scsi_init_sgtable(struct request *req, 
> struct scsi_data_buffer *sdb)
>       count = blk_rq_map_sg(req->q, req, sdb->table.sgl);
>       BUG_ON(count > sdb->table.nents);
>       sdb->table.nents = count;
> -     sdb->length = blk_rq_bytes(req);
> +     sdb->length = blk_rq_payload_bytes(req);
>       return BLKPREP_OK;
>  }
>  
> 
Reviewed-by: Hannes Reinecke <h...@suse.com>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                Teamlead Storage & Networking
h...@suse.de                                   +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton
HRB 21284 (AG Nürnberg)
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