[PATCH] bcache: add mutex lock for bch_is_open
From: Jianjian Huo <hidden>
Date: 2014-07-13 16:09:31
Subsystem:
bcache (block layer cache), the rest · Maintainers:
Coly Li, Kent Overstreet, Linus Torvalds
Since bch_is_open will iterate linked list bch_cache_sets and uncached_devices, it needs bch_register_lock. Signed-off-by: Jianjian Huo <redacted> --- 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