[PATCH] drm/fb-helper: generic: Fix drm_fbdev_client_restore()

[Noralf Trønnes]

Den 28.01.2019 12.49, skrev Gerd Hoffmann:
> On Mon, Jan 28, 2019 at 11:25:28AM +0100, Noralf Trønnes wrote:
>>
>>
>> Den 28.01.2019 07.48, skrev Gerd Hoffmann:
>>>> Fix by using drm_fb_helper_lastclose() which checks if fbdev is in use.
>>>
>>>>  static int drm_fbdev_client_restore(struct drm_client_dev *client)
>>>>  {
>>>> -	struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
>>>> -
>>>> -	drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper);
>>>> +	drm_fb_helper_lastclose(client->dev);
>>>>  
>>>>  	return 0;
>>>>  }
>>>
>>> Hmm, at least the drm_fb_helper_lastclose() version I'm looking at
>>> (branch drm-misc-next) just calls
>>> drm_fb_helper_restore_fbdev_mode_unlocked without any check ...
>>>
>>
>> drm_fb_helper_lastclose() uses drm_device->fb_helper which is NULL if
>> fbdev is not in use,
> 
> Ah, ok.  In contrast drm_fb_helper_from_client() never returns NULL.
> Missed that detail.
> 
> Reviewed-by: Gerd Hoffmann <kraxel at redhat.com>
> 

Applied, thanks for your review.

Noralf.