Since bch_is_open will iterate linked list bch_cache_sets and uncached_devices, it needs bch_register_lock.
Signed-off-by: Jianjian Huo <[email protected]> --- drivers/md/bcache/super.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c index 92dcbfd..3391c53 100644 --- a/drivers/md/bcache/super.c +++ b/drivers/md/bcache/super.c @@ -1933,10 +1933,12 @@ 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; } -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-bcache" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
