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Commit 789d21db authored by Jianjian Huo's avatar Jianjian Huo Committed by Kent Overstreet
Browse files

bcache: add mutex lock for bch_is_open 



Since bch_is_open will iterate linked list bch_cache_sets and
uncached_devices, it needs bch_register_lock.

Signed-off-by: default avatarJianjian Huo <samuel.huo@gmail.com>
parent 5b25abad

drivers/md/bcache/super.c

+2 −0
Original line number Diff line number Diff line
@@ -1966,10 +1966,12 @@ static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr, 
	if (IS_ERR(bdev)) {

		if (bdev == ERR_PTR(-EBUSY)) {

			bdev = lookup_bdev(strim(path));

			mutex_lock(&bch_register_lock);

			if (!IS_ERR(bdev) && bch_is_open(bdev))

				err = "device already registered";

			else

				err = "device busy";

			mutex_unlock(&bch_register_lock);

		}

		goto err;

	}