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bcache: add mutex lock for bch_is_open

Browse source 
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>
This commit is contained in:
Jianjian Huo 2014-07-13 09:08:59 -07:00 • committed by Kent Overstreet
parent 5b25abade2
commit 789d21dbd9
1 changed files with 2 additions and 0 deletions
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2
drivers/md/bcache/super.c
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@ -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;
}