diff options
| -rw-r--r-- | drivers/gpu/drm/drm_irq.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c index c0f0046d8078..2ba9d7fac345 100644 --- a/drivers/gpu/drm/drm_irq.c +++ b/drivers/gpu/drm/drm_irq.c @@ -106,6 +106,7 @@ static void vblank_disable_and_save(struct drm_device *dev, int crtc) s64 diff_ns; int vblrc; struct timeval tvblank; + int count = DRM_TIMESTAMP_MAXRETRIES; /* Prevent vblank irq processing while disabling vblank irqs, * so no updates of timestamps or count can happen after we've @@ -131,7 +132,10 @@ static void vblank_disable_and_save(struct drm_device *dev, int crtc) do { dev->last_vblank[crtc] = dev->driver->get_vblank_counter(dev, crtc); vblrc = drm_get_last_vbltimestamp(dev, crtc, &tvblank, 0); - } while (dev->last_vblank[crtc] != dev->driver->get_vblank_counter(dev, crtc)); + } while (dev->last_vblank[crtc] != dev->driver->get_vblank_counter(dev, crtc) && (--count) && vblrc); + + if (!count) + vblrc = 0; /* Compute time difference to stored timestamp of last vblank * as updated by last invocation of drm_handle_vblank() in vblank irq. |