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| author | Jianjian Huo <samuel.huo@gmail.com> | 2014-07-13 09:08:59 -0700 |
|---|---|---|
| committer | Kent Overstreet <kmo@daterainc.com> | 2014-08-04 15:23:04 -0700 |
| commit | 789d21dbd9d8889e62c79ec19585fcc97e42ef07 (patch) | |
| tree | b0b8e1f363d871b67fa9197da6b671e5a485d790 | |
| parent | 5b25abade29616d42d60f9bd5e6a5ad07f7314e3 (diff) | |
| download | linux-789d21dbd9d8889e62c79ec19585fcc97e42ef07.tar.gz linux-789d21dbd9d8889e62c79ec19585fcc97e42ef07.tar.bz2 linux-789d21dbd9d8889e62c79ec19585fcc97e42ef07.zip | |
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>
| -rw-r--r-- | drivers/md/bcache/super.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c index b6114d672413..60e75130a44c 100644 --- a/drivers/md/bcache/super.c +++ b/drivers/md/bcache/super.c @@ -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; } |