---

yaml --- r: 258605 b: refs/heads/master c: 0f79960 h: refs/heads/master i: 258603: d0f36e6 v: v3
git-mirror · Jul 6, 2011 · 521ffeb · 521ffeb
1 parent 70d1fb1
commit 521ffeb
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Showing 2 changed files with 5 additions and 2 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 390192b300570b2bc721d77067ca133f58015ae8
+refs/heads/master: 0f79960391a5a1e3679956024e18aeeb0369ac44
diff --git a/trunk/block/blk-lib.c b/trunk/block/blk-lib.c
@@ -59,7 +59,10 @@ int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
 	 * granularity
 	 */
 	max_discard_sectors = min(q->limits.max_discard_sectors, UINT_MAX >> 9);
-	if (q->limits.discard_granularity) {
+	if (!unlikely(!max_discard_sectors)) {
+		/* Avoid infinite loop below. Being cautious never hurts. */
+		return -EOPNOTSUPP;
+	} else if (q->limits.discard_granularity) {
 		unsigned int disc_sects = q->limits.discard_granularity >> 9;
 
 		max_discard_sectors &= ~(disc_sects - 1);