[PATCH 3/7] Revert "drm/vblank: Do not update vblank count if interrupts are already disabled."

[StanLis]

From: Stanislav Lisovskiy <stanislav.lisovskiy at intel.com>

This reverts commit 68036b08b91bc491ccc308f902616a570a49227c.
---
 drivers/gpu/drm/drm_vblank.c | 18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/drm_vblank.c b/drivers/gpu/drm/drm_vblank.c
index e9b1bafaae56..cccdc5f55bea 100644
--- a/drivers/gpu/drm/drm_vblank.c
+++ b/drivers/gpu/drm/drm_vblank.c
@@ -353,25 +353,23 @@ void drm_vblank_disable_and_save(struct drm_device *dev, unsigned int pipe)
 	spin_lock_irqsave(&dev->vblank_time_lock, irqflags);
 
 	/*
-	 * Update vblank count and disable vblank interrupts only if the
-	 * interrupts were enabled. This avoids calling the ->disable_vblank()
-	 * operation in atomic context with the hardware potentially runtime
-	 * suspended.
+	 * Only disable vblank interrupts if they're enabled. This avoids
+	 * calling the ->disable_vblank() operation in atomic context with the
+	 * hardware potentially runtime suspended.
 	 */
-	if (!vblank->enabled)
-		goto out;
+	if (vblank->enabled) {
+		__disable_vblank(dev, pipe);
+		vblank->enabled = false;
+	}
 
 	/*
-	 * Update the count and timestamp to maintain the
+	 * Always update the count and timestamp to maintain the
 	 * appearance that the counter has been ticking all along until
 	 * this time. This makes the count account for the entire time
 	 * between drm_crtc_vblank_on() and drm_crtc_vblank_off().
 	 */
 	drm_update_vblank_count(dev, pipe, false);
-	__disable_vblank(dev, pipe);
-	vblank->enabled = false;
 
-out:
 	spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags);
 }
 
-- 
2.17.0