[PATCH 2/3] drm/gma500: Fix crtc_vblank reference leak when userspace queues multiple events

[Michel Dänzer]

On 2022-09-05 15:37, Hans de Goede wrote:
> The gma500 page-flip code kinda assume that userspace never queues more
> then 1 vblank event. So basically it assume that userspace does:
> 
> - page-flip
> - wait for vblank event
> - render
> - page-flip
> - etc.
> 
> In the case where userspace would submit 2 page-flips without waiting
> for the first to finish, the current code will just overwrite
> gma_crtc->page_flip_event with the event from the 2nd page-flip.

This cannot happen. Common code returns -EBUSY for an attempt to submit a page flip while another one is still pending.


-- 
Earthling Michel Dänzer            |                  https://redhat.com
Libre software enthusiast          |         Mesa and Xwayland developer