[ Upstream commit a25cedb4313d35e1f2968105678a47ca28e84d3b ] One fewer pointer dereference, and in the future we may not be able to count on the mapping pointer being populated (e.g. in the DIO case). Signed-off-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Signed-off-by: Sasha Levin <sashal@kernel.org>