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-rw-r--r--shared-core/i915_irq.c15
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)