drm/exynos: call drm_vblank_put for each queued flip event

It's guaranteed that for each event on pageflip_event_list we have
called drm_vblank_get() - see exynos_drm_crtc_page_flip() - so checking
for this is redundant.

Also we need to call drm_vblank_put() for each event on the list, not
only once, otherwise we'd leak vblank references if there are multiple
events on the list.
Signed-off-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>

drivers/gpu/drm/exynos/exynos_drm_fimd.c

@@ -642,16 +642,10 @@ static void fimd_finish_pageflip(struct drm_device *drm_dev, int crtc)
 
 		list_move_tail(&e->base.link, &e->base.file_priv->event_list);
 		wake_up_interruptible(&e->base.file_priv->event_wait);
+		drm_vblank_put(drm_dev, crtc);
 	}
 
 	if (is_checked) {
-		/*
-		 * call drm_vblank_put only in case that drm_vblank_get was
-		 * called.
-		 */
-		if (atomic_read(&drm_dev->vblank_refcount[crtc]) > 0)
-			drm_vblank_put(drm_dev, crtc);
-
 		/*
 		 * don't off vblank if vblank_disable_allowed is 1,
 		 * because vblank would be off by timer handler.

drivers/gpu/drm/exynos/exynos_drm_vidi.c

@@ -401,16 +401,10 @@ static void vidi_finish_pageflip(struct drm_device *drm_dev, int crtc)
 
 		list_move_tail(&e->base.link, &e->base.file_priv->event_list);
 		wake_up_interruptible(&e->base.file_priv->event_wait);
+		drm_vblank_put(drm_dev, crtc);
 	}
 
 	if (is_checked) {
-		/*
-		 * call drm_vblank_put only in case that drm_vblank_get was
-		 * called.
-		 */
-		if (atomic_read(&drm_dev->vblank_refcount[crtc]) > 0)
-			drm_vblank_put(drm_dev, crtc);
-
 		/*
 		 * don't off vblank if vblank_disable_allowed is 1,
 		 * because vblank would be off by timer handler.

drivers/gpu/drm/exynos/exynos_mixer.c

@@ -884,7 +884,6 @@ static void mixer_finish_pageflip(struct drm_device *drm_dev, int crtc)
 	struct drm_pending_vblank_event *e, *t;
 	struct timeval now;
 	unsigned long flags;
-	bool is_checked = false;
 
 	spin_lock_irqsave(&drm_dev->event_lock, flags);
 
@@ -894,7 +893,6 @@ static void mixer_finish_pageflip(struct drm_device *drm_dev, int crtc)
 		if (crtc != e->pipe)
 			continue;
 
-		is_checked = true;
 		do_gettimeofday(&now);
 		e->event.sequence = 0;
 		e->event.tv_sec = now.tv_sec;
@@ -902,16 +900,9 @@ static void mixer_finish_pageflip(struct drm_device *drm_dev, int crtc)
 
 		list_move_tail(&e->base.link, &e->base.file_priv->event_list);
 		wake_up_interruptible(&e->base.file_priv->event_wait);
+		drm_vblank_put(drm_dev, crtc);
 	}
 
-	if (is_checked)
-		/*
-		 * call drm_vblank_put only in case that drm_vblank_get was
-		 * called.
-		 */
-		if (atomic_read(&drm_dev->vblank_refcount[crtc]) > 0)
-			drm_vblank_put(drm_dev, crtc);
-
 	spin_unlock_irqrestore(&drm_dev->event_lock, flags);
 }