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i915: check dummy page before freeing 

The dummy read page will point to NULL if drm_bo_driver_init failed at
firstopen (modeset is not enabled), and will cause kernel oops at
subsequent drm_lastclose call, so be sure to check it.
main
Hong Liu 2008-05-19 17:06:40 +08:00 committed by Jesse Barnes
parent e8320a716d
commit 1cde3cc1ac
1 changed files with 4 additions and 2 deletions
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6
linux-core/drm_bo.c
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@ -2361,10 +2361,12 @@ int drm_bo_driver_finish(struct drm_device *dev)
if (list_empty(&bm->unfenced))
DRM_DEBUG("Unfenced list was clean\n");
if (bm->dummy_read_page) {
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,15))
ClearPageReserved(bm->dummy_read_page);
ClearPageReserved(bm->dummy_read_page);
#endif
__free_page(bm->dummy_read_page);
__free_page(bm->dummy_read_page);
}
out:
mutex_unlock(&dev->struct_mutex);