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drm/i915: Wait for vblank before unpinning old fb 

Be paranoid and ensure that the vblank has passed and the scanout has
switched to the new fb, before unpinning the old one and possibly
tearing down its PTEs.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2010-12-14 16:09:31 +00:00
parent c6df541c00
commit b7f1de289c
1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/drm/i915/intel_display.c
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@ -1626,8 +1626,10 @@ intel_pipe_set_base(struct drm_crtc *crtc, int x, int y,
return ret;
}
if (old_fb)
if (old_fb) {
intel_wait_for_vblank(dev, intel_crtc->pipe);
i915_gem_object_unpin(to_intel_framebuffer(old_fb)->obj);
}
mutex_unlock(&dev->struct_mutex);