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drm/i915: Wait for vblank before unpinning old fb

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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);