On 26.04.2018 22:23, je...@suse.com wrote:
> From: Jeff Mahoney <je...@suse.com>
> 
> btrfs_init_work clears the work struct except for ->wq, so the memset
> before calling btrfs_init_work in qgroup_rescan_init is unnecessary.
> 
> We'll also initialize ->wq in btrfs_init_work so that it's obvious.
> 
> Signed-off-by: Jeff Mahoney <je...@suse.com>

Reviewed-by: Nikolay Borisov <nbori...@suse.com>

> ---
>  fs/btrfs/async-thread.c | 1 +
>  fs/btrfs/qgroup.c       | 2 --
>  2 files changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/fs/btrfs/async-thread.c b/fs/btrfs/async-thread.c
> index d5540749f0e5..c614fb7b9b9d 100644
> --- a/fs/btrfs/async-thread.c
> +++ b/fs/btrfs/async-thread.c
> @@ -354,6 +354,7 @@ void btrfs_init_work(struct btrfs_work *work, 
> btrfs_work_func_t uniq_func,
>       INIT_WORK(&work->normal_work, uniq_func);
>       INIT_LIST_HEAD(&work->ordered_list);
>       work->flags = 0;
> +     work->wq = NULL;
>  }
>  
>  static inline void __btrfs_queue_work(struct __btrfs_workqueue *wq,
> diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
> index be491b6c020a..8de423a0c7e3 100644
> --- a/fs/btrfs/qgroup.c
> +++ b/fs/btrfs/qgroup.c
> @@ -2740,8 +2740,6 @@ qgroup_rescan_init(struct btrfs_fs_info *fs_info, u64 
> progress_objectid,
>       spin_unlock(&fs_info->qgroup_lock);
>       mutex_unlock(&fs_info->qgroup_rescan_lock);
>  
> -     memset(&fs_info->qgroup_rescan_work, 0,
> -            sizeof(fs_info->qgroup_rescan_work));
>       btrfs_init_work(&fs_info->qgroup_rescan_work,
>                       btrfs_qgroup_rescan_helper,
>                       btrfs_qgroup_rescan_worker, NULL, NULL);
> 
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