Obviously the created writesame bio has to be aligned with logical block size, and use bio_allowed_max_sectors() to retrieve this number. Fixes: b49a0871be31a745b2ef ("block: remove split code in blkdev_issue_{discard,write_same}") Cc: Rui Salvaterra <rsalvaterra@xxxxxxxxx> Cc: stable@xxxxxxxxxxxxxxx Cc: Mike Snitzer <snitzer@xxxxxxxxxx> Cc: Christoph Hellwig <hch@xxxxxx> Cc: Xiao Ni <xni@xxxxxxxxxx> Cc: Mariusz Dabrowski <mariusz.dabrowski@xxxxxxxxx> Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxx> --- block/blk-lib.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/block/blk-lib.c b/block/blk-lib.c index d58d5d87dd88..e8b3bb9bf375 100644 --- a/block/blk-lib.c +++ b/block/blk-lib.c @@ -149,7 +149,7 @@ static int __blkdev_issue_write_same(struct block_device *bdev, sector_t sector, return -EOPNOTSUPP; /* Ensure that max_write_same_sectors doesn't overflow bi_size */ - max_write_same_sectors = UINT_MAX >> 9; + max_write_same_sectors = bio_allowed_max_sectors(q); while (nr_sects) { bio = blk_next_bio(bio, 1, gfp_mask); -- 2.9.5