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| author | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2014-08-06 14:49:52 +0300 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2014-08-06 22:39:27 +0200 |
| commit | ffe7c73a8d4f0caeebd5d220ddbf7126a4daca1f (patch) | |
| tree | d232fbd70fd400e9cf4c73a22f0eb717eea20deb /drivers/gpu/drm/drm_irq.c | |
| parent | 56cc279b29c7b204fe7d0943509ae209b8b128db (diff) | |
| download | linux-ffe7c73a8d4f0caeebd5d220ddbf7126a4daca1f.tar.gz | |
drm: Fix race between drm_vblank_off() and drm_queue_vblank_event()
Currently it's possible that the following will happen: 1. drm_wait_vblank() calls drm_vblank_get() 2. drm_vblank_off() gets called 3. drm_wait_vblank() calls drm_queue_vblank_event() which adds the event to the queue event though vblank interrupts are currently disabled (and may not be re-enabled ever again). To fix the problem, add another vblank->enabled check into drm_queue_vblank_event(). drm_vblank_off() holds event_lock around the vblank disable, so no further locking needs to be added to drm_queue_vblank_event(). vblank disable from another source is not possible since drm_wait_vblank() already holds a vblank reference. Reviewed-by: Matt Roper <matthew.d.roper@intel.com> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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; |