[PATCH] dm cache: fix divide error in too_many_discard_blocks()

[Drif Abdelmalek Mohamed Said]

#syz test

diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index 1a5072425c4a..2d40d6047ef1 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -2383,9 +2383,7 @@ static int create_cache_policy(struct cache *cache, struct cache_args *ca,
 static bool too_many_discard_blocks(sector_t discard_block_size,
 				    sector_t origin_size)
 {
-	(void) sector_div(origin_size, discard_block_size);
-
-	return origin_size > MAX_DISCARD_BLOCKS;
+	return div64_u64(origin_size, discard_block_size) > MAX_DISCARD_BLOCKS;
 }
 
 static sector_t calculate_discard_block_size(sector_t cache_block_size,
-- 
2.43.0