drm/radeon: async event synchronization for drmWaitVblank
Bring radeon up to speed with the async event synchronization for drmWaitVblank. See c9a9c5e0 for more information. Without this patch event never get delivered to userspace client. Signed-off-by: Jerome Glisse <jglisse@redhat.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
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68b3adb4
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