Re: [PATCH 11/11] drm/omap: page-flip fixes

[Imre Deak <imre.deak@intel.com>]

On Mon, 2012-10-08 at 14:50 -0500, Rob Clark wrote:
> From: Rob Clark <rob@ti.com>
> 
> Userspace might not request a vblank event.  So it is not an error
> for 'event' to be NULL, and we shouldn't use it to determine if
> there is a pending flip already.
> 
> Signed-off-by: Rob Clark <rob@ti.com>
> ---
>  drivers/staging/omapdrm/omap_crtc.c |    6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/staging/omapdrm/omap_crtc.c b/drivers/staging/omapdrm/omap_crtc.c
> index 74e019a..317b854 100644
> --- a/drivers/staging/omapdrm/omap_crtc.c
> +++ b/drivers/staging/omapdrm/omap_crtc.c
> @@ -119,7 +119,6 @@ static void vblank_cb(void *arg)
>  	struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
>  	unsigned long flags;
>  
> -	WARN_ON(!event);
>  	spin_lock_irqsave(&dev->event_lock, flags);
>  
>  	/* wakeup userspace */
> @@ -127,6 +126,7 @@ static void vblank_cb(void *arg)
>  		drm_send_vblank_event(dev, -1, omap_crtc->event);
>  
>  	omap_crtc->event = NULL;
> +	omap_crtc->old_fb = NULL;

Is old_fb used anywhere? If not we could just remove it.

Otherwise nice work! On the series:

Reviewed-by: Imre Deak <imre.deak@intel.com>

>  
>  	spin_unlock_irqrestore(&dev->event_lock, flags);
>  }
> @@ -138,8 +138,6 @@ static void page_flip_cb(void *arg)
>  	struct drm_framebuffer *old_fb = omap_crtc->old_fb;
>  	struct drm_gem_object *bo;
>  
> -	omap_crtc->old_fb = NULL;
> -
>  	omap_crtc_mode_set_base(crtc, crtc->x, crtc->y, old_fb);
>  
>  	/* really we'd like to setup the callback atomically w/ setting the
> @@ -162,7 +160,7 @@ static int omap_crtc_page_flip_locked(struct drm_crtc *crtc,
>  
>  	DBG("%d -> %d", crtc->fb ? crtc->fb->base.id : -1, fb->base.id);
>  
> -	if (omap_crtc->event) {
> +	if (omap_crtc->old_fb) {
>  		dev_err(dev->dev, "already a pending flip\n");
>  		return -EINVAL;
>  	}