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[ Upstream commit283f1e383e] unmap_udmabuf fails to actually unmap the scatterlist, leaving dangling mappings around. Fixes:fbb0de7950("Add udmabuf misc device") Signed-off-by: Lucas Stach <l.stach@pengutronix.de> Link: http://patchwork.freedesktop.org/patch/msgid/20190604202331.17482-1-l.stach@pengutronix.de Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Signed-off-by: Sasha Levin <sashal@kernel.org>