Re: [PATCH 3/8] ufshcd: set max_segment_size in the scsi host template

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On 6/17/19 5:19 AM, Christoph Hellwig wrote:
We need to also mirror the value to the device to ensure IOMMU merging
doesn't undo it, and the SCSI host level parameter will ensure that.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
  drivers/scsi/ufs/ufshcd.c | 3 +--
  1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 3fe3029617a8..505d625ed28d 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -4587,8 +4587,6 @@ static int ufshcd_slave_configure(struct scsi_device *sdev)
  	struct request_queue *q = sdev->request_queue;
blk_queue_update_dma_pad(q, PRDT_DATA_BYTE_COUNT_PAD - 1);
-	blk_queue_max_segment_size(q, PRDT_DATA_BYTE_COUNT_MAX);
-
  	return 0;
  }
@@ -6991,6 +6989,7 @@ static struct scsi_host_template ufshcd_driver_template = {
  	.sg_tablesize		= SG_ALL,
  	.cmd_per_lun		= UFSHCD_CMD_PER_LUN,
  	.can_queue		= UFSHCD_CAN_QUEUE,
+	.max_segment_size	= PRDT_DATA_BYTE_COUNT_MAX,
  	.max_host_blocked	= 1,
  	.track_queue_depth	= 1,
  	.sdev_groups		= ufshcd_driver_groups,

Reviewed-by: Bart Van Assche <bvanassche@xxxxxxx>



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