[PATCH 2/4] xen-blkfront: rely on the default discard granularity

[Christoph Hellwig]

The block layer now sets the discard granularity to the physical
block size default.  Take advantage of that in xen-blkfront and only
set the discard granularity if explicitly specified.

Signed-off-by: Christoph Hellwig <h...@lst.de>
Acked-by: Roger Pau Monné <roger....@citrix.com>
---
 drivers/block/xen-blkfront.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index f78167cd5a6333..1258f24b285500 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -951,8 +951,8 @@ static void blkif_set_queue_limits(struct blkfront_info 
*info)
 
        if (info->feature_discard) {
                blk_queue_max_discard_sectors(rq, UINT_MAX);
-               rq->limits.discard_granularity = info->discard_granularity ?:
-                                                info->physical_sector_size;
+               if (info->discard_granularity)
+                       rq->limits.discard_granularity = 
info->discard_granularity;
                rq->limits.discard_alignment = info->discard_alignment;
                if (info->feature_secdiscard)
                        blk_queue_max_secure_erase_sectors(rq, UINT_MAX);
-- 
2.39.2