diff options
| -rw-r--r-- | shared-core/i915_irq.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/shared-core/i915_irq.c b/shared-core/i915_irq.c index ea84c708..7baa23c0 100644 --- a/shared-core/i915_irq.c +++ b/shared-core/i915_irq.c @@ -612,6 +612,21 @@ int i915_vblank_swap(struct drm_device *dev, void *data, return -EINVAL; } + DRM_SPINLOCK_IRQSAVE(&dev->drw_lock, irqflags); + + /* It makes no sense to schedule a swap for a drawable that doesn't have + * valid information at this point. E.g. this could mean that the X + * server is too old to push drawable information to the DRM, in which + * case all such swaps would become ineffective. + */ + if (!drm_get_drawable_info(dev, swap->drawable)) { + DRM_SPINUNLOCK_IRQRESTORE(&dev->drw_lock, irqflags); + DRM_DEBUG("Invalid drawable ID %d\n", swap->drawable); + return -EINVAL; + } + + DRM_SPINUNLOCK_IRQRESTORE(&dev->drw_lock, irqflags); + curseq = atomic_read(pipe ? &dev->vbl_received2 : &dev->vbl_received); if (seqtype == _DRM_VBLANK_RELATIVE) |