[PATCH 3/5] brd: fix aligned_sector from brd_do_discard()

[Yu Kuai]

From: Yu Kuai <yukuai3@xxxxxxxxxx>

The calculation is just wrong, fix it by round_up().

Fixes: 9ead7efc6f3f ("brd: implement discard support")
Signed-off-by: Yu Kuai <yukuai3@xxxxxxxxxx>
---
 drivers/block/brd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/block/brd.c b/drivers/block/brd.c
index 740ed13faaff..21e841e09a89 100644
--- a/drivers/block/brd.c
+++ b/drivers/block/brd.c
@@ -233,7 +233,7 @@ static void brd_free_one_page(struct rcu_head *head)
 
 static void brd_do_discard(struct brd_device *brd, sector_t sector, u32 size)
 {
-	sector_t aligned_sector = (sector + PAGE_SECTORS) & ~PAGE_SECTORS;
+	sector_t aligned_sector = round_up(sector, PAGE_SECTORS);
 	struct page *page;
 
 	size -= (aligned_sector - sector) * SECTOR_SIZE;
-- 
2.39.2