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i915: Reinstate check that drawable has valid information in i915_vblank_swap.

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This commit is contained in:
Michel Dänzer 2007-09-18 21:03:22 +01:00
parent 78d111fa96
commit e349b58b4a
1 changed files with 15 additions and 0 deletions
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15
shared-core/i915_irq.c
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@ -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)