On 2020/1/14 22:19, Jiri Kosina wrote:

On Tue, 14 Jan 2020, Leizhen (ThunderTown) wrote:

quoted

Does no one pay attention to this problem? Although there is no
functional problem, but it seems confusing.

        if (!list->hiddev->exist) {                 <---------
                res = -ENODEV;                                |
                goto bail_unlock;                             |
        }                                                     |
        if (!list->hiddev->open++)                            |
                if (list->hiddev->exist) {          <--------- //It's always true.

This code no longer exists after refactoring that happened in commit 
18a1b06e5b91d47.

OK