On Fri, 2013-11-29 at 16:42 +0800, majianpeng wrote:
> Test cdrom on intel ahci, it will trigger this condition.
> This is because scsi-mq don' test 'q->dma_drain_size &&
> blk_rq_bytes(rq)' like in blk_peek_request().
>
> Signed-off-by: Jianpeng Ma <[email protected]>
> ---
> drivers/scsi/scsi-mq.c | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
Applied, + squashed into current target-pending/scsi-mq code.
Thanks Jianpeng!
--nab
> diff --git a/drivers/scsi/scsi-mq.c b/drivers/scsi/scsi-mq.c
> index 933ba0f..78b05c1 100644
> --- a/drivers/scsi/scsi-mq.c
> +++ b/drivers/scsi/scsi-mq.c
> @@ -35,6 +35,16 @@ static int scsi_mq_queue_rq(struct blk_mq_hw_ctx *hctx,
> struct request *rq)
> sc->device = sdev;
> sc->sense_buffer = sense_buf;
> sc->mq_sgl = sg;
> +
> + if (q->dma_drain_size && blk_rq_bytes(rq)) {
> + /*
> + * make sure space for the drain appears we
> + * know we can do this because max_hw_segments
> + * has been adjusted to be one fewer than the
> + * device can handle
> + */
> + rq->nr_phys_segments++;
> + }
> /*
> * Mark the end of the pre-allocated SGL based upon the
> * incoming number of physical segments from blk-mq
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