drm/msm: block incoming update on pending updates

[cascardo/linux.git] / drivers / gpu / drm / drm_irq.c

diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index 5ef03c2..f5a5f18 100644 (file)
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -166,7 +166,7 @@ static void vblank_disable_and_save(struct drm_device *dev, int crtc)
        spin_lock_irqsave(&dev->vblank_time_lock, irqflags);
 
        /*
-        * If the vblank interrupt was already disbled update the count
+        * If the vblank interrupt was already disabled 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_vblank_on() and
@@ -1029,7 +1029,8 @@ void drm_vblank_put(struct drm_device *dev, int crtc)
 {
        struct drm_vblank_crtc *vblank = &dev->vblank[crtc];
 
-       BUG_ON(atomic_read(&vblank->refcount) == 0);
+       if (WARN_ON(atomic_read(&vblank->refcount) == 0))
+               return;
 
        if (WARN_ON(crtc >= dev->num_crtcs))
                return;
@@ -1190,7 +1191,7 @@ EXPORT_SYMBOL(drm_crtc_vblank_off);
  *
  * This functions restores the vblank interrupt state captured with
  * drm_vblank_off() again. Note that calls to drm_vblank_on() and
- * drm_vblank_off() can be unbalanced and so can also be unconditionaly called
+ * drm_vblank_off() can be unbalanced and so can also be unconditionally called
  * in driver load code to reflect the current hardware state of the crtc.
  *
  * This is the legacy version of drm_crtc_vblank_on().
@@ -1237,7 +1238,7 @@ EXPORT_SYMBOL(drm_vblank_on);
  *
  * This functions restores the vblank interrupt state captured with
  * drm_vblank_off() again. Note that calls to drm_vblank_on() and
- * drm_vblank_off() can be unbalanced and so can also be unconditionaly called
+ * drm_vblank_off() can be unbalanced and so can also be unconditionally called
  * in driver load code to reflect the current hardware state of the crtc.
  *
  * This is the native kms version of drm_vblank_on().