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And destroy all other FBs. This is so that other DRM masters can only get access to this all-black FB, not to any other FB we created, while we're switched away and not DRM master. Fixes: b09fde0d ("Use reference counting for tracking KMS framebuffer lifetimes") (Ported from radeon commit 06a465484101f21e99d3a0a62fb03440bcaff93e) Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
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