[PATCH -next] btrfs: integrity-checker: use DEFINE_MUTEX() for mutex lock

[Zheng Yongjun]

mutex lock can be initialized automatically with DEFINE_MUTEX()
rather than explicitly calling mutex_init().

Reported-by: Hulk Robot <hul...@huawei.com>
Signed-off-by: Zheng Yongjun <zhengyongj...@huawei.com>
---
 fs/btrfs/check-integrity.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/fs/btrfs/check-integrity.c b/fs/btrfs/check-integrity.c
index 169508609324..7af9273ef1b6 100644
--- a/fs/btrfs/check-integrity.c
+++ b/fs/btrfs/check-integrity.c
@@ -370,7 +370,7 @@ static void btrfsic_cmp_log_and_dev_bytenr(struct 
btrfsic_state *state,
                                           struct btrfsic_dev_state *dev_state,
                                           u64 dev_bytenr);
 
-static struct mutex btrfsic_mutex;
+static DEFINE_MUTEX(btrfsic_mutex);
 static int btrfsic_is_initialized;
 static struct btrfsic_dev_state_hashtable btrfsic_dev_state_hashtable;
 
@@ -2787,7 +2787,6 @@ int btrfsic_mount(struct btrfs_fs_info *fs_info,
                return -ENOMEM;
 
        if (!btrfsic_is_initialized) {
-               mutex_init(&btrfsic_mutex);
                btrfsic_dev_state_hashtable_init(&btrfsic_dev_state_hashtable);
                btrfsic_is_initialized = 1;
        }