diff options
Diffstat (limited to 'drivers/gpu/drm/drm_irq.c')
| -rw-r--r-- | drivers/gpu/drm/drm_irq.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c index 9353609c6770..b2428cb0c64d 100644 --- a/drivers/gpu/drm/drm_irq.c +++ b/drivers/gpu/drm/drm_irq.c @@ -1270,6 +1270,7 @@ static int drm_queue_vblank_event(struct drm_device *dev, int pipe, union drm_wait_vblank *vblwait, struct drm_file *file_priv) { + struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; struct drm_pending_vblank_event *e; struct timeval now; unsigned long flags; @@ -1293,6 +1294,18 @@ static int drm_queue_vblank_event(struct drm_device *dev, int pipe, spin_lock_irqsave(&dev->event_lock, flags); + /* + * drm_vblank_off() might have been called after we called + * drm_vblank_get(). drm_vblank_off() holds event_lock + * around the vblank disable, so no need for further locking. + * The reference from drm_vblank_get() protects against + * vblank disable from another source. + */ + if (!vblank->enabled) { + ret = -EINVAL; + goto err_unlock; + } + if (file_priv->event_space < sizeof e->event) { ret = -EBUSY; goto err_unlock; |