Hi Tomeu,
On 4 April 2016 at 14:55, Tomeu Vizoso <tomeu.vizoso@xxxxxxxxxxxxx> wrote:
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_fb.c b/drivers/gpu/drm/rockchip/rockchip_drm_fb.c
> index 3b8f652698f8..8305bbd2a4d7 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_fb.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_fb.c
> @@ -280,7 +280,18 @@ int rockchip_drm_atomic_commit(struct drm_device *dev,
> {
> struct rockchip_drm_private *private = dev->dev_private;
> struct rockchip_atomic_commit *commit = &private->commit;
> - int ret;
> + struct drm_crtc_state *crtc_state;
> + struct drm_crtc *crtc;
> + int i, ret;
> +
> + if (async) {
> + for_each_crtc_in_state(state, crtc, crtc_state, i) {
> + if (crtc->state->event ||
> + rockchip_drm_crtc_has_pending_event(crtc)) {
> + return -EBUSY;
> + }
> + }
> + }
Hmmm ...
Doesn't this trigger before the VOP atomic_begin() helper, meaning
that anything with an event set will trigger the check? Seems like it
should be && rather than ||.
Also, I know rockchip_drm_vop.c isn't holding dev->event_lock when it
checks vop->event, but it really should be ... and so should this
check. Otherwise you can race with the IRQ handler, which isn't
required to hold the CRTC lock.
Cheers,
Daniel
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