mmc: protect the tmio_mmc driver against a theoretical race
The MMC subsystem does not guarantee, that host driver .request() and .set_ios() callbacks are serialised. Such concurrent calls, however, do not have to be meaningfully supported, drivers just have to make sure to avoid any severe problems. Signed-off-by:Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by:
Chris Ball <cjb@laptop.org>
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