You can make AddMap simpler by using a stack based drm_map_t and then
allocating the real one at the end. It lets you remove all of the
drm_free(map, sizeof(*map), DRM_MEM_MAPS);
This should be done at the very end after all of the error returns:
if (drm_core_has_MTRR(dev)) {
if (map->type == _DRM_FRAME_BUFFER ||
(map->flags & _DRM_WRITE_COMBINING)) {
map->mtrr = mtrr_add(map->offset, map->size,
MTRR_TYPE_WRCOMB, 1);
}
}
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