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: Jianjian Huo <samuel.huo@gmail.com>
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index b6114d6..60e7513 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -1966,10 +1966,12 @@
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;
}