From: Anand Jain Date: Thu, 12 Apr 2018 02:29:37 +0000 (+0800) Subject: btrfs: drop uuid_mutex in btrfs_destroy_dev_replace_tgtdev X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=ab5c2f65debc23d6f76cbb7e743ff4d10e66dce0;p=openwrt%2Fstaging%2Fblogic.git btrfs: drop uuid_mutex in btrfs_destroy_dev_replace_tgtdev Delete the uuid_mutex lock here as this thread accesses the btrfs_fs_devices::devices only (counters or called functions do a list traversal). And the device_list_mutex lock is already taken. Signed-off-by: Anand Jain Reviewed-by: David Sterba [ update changelog ] Signed-off-by: David Sterba --- diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 271d9be6e1da..28715e4c3097 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -2152,7 +2152,6 @@ void btrfs_rm_dev_replace_free_srcdev(struct btrfs_fs_info *fs_info, void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info, struct btrfs_device *tgtdev) { - mutex_lock(&uuid_mutex); WARN_ON(!tgtdev); mutex_lock(&fs_info->fs_devices->device_list_mutex); @@ -2168,7 +2167,6 @@ void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info, list_del_rcu(&tgtdev->dev_list); mutex_unlock(&fs_info->fs_devices->device_list_mutex); - mutex_unlock(&uuid_mutex); /* * The update_dev_time() with in btrfs_scratch_superblocks()