ASoC: dapm: Add helpers to lock/unlock DAPM mutex
Acquiring the DAPM mutex is necessary before using several DAPM functions and dereference is quite ugly. This patch provides a helper function to simplify this. Signed-off-by: NCharles Keepax <ckeepax@opensource.wolfsonmicro.com> Signed-off-by: NMark Brown <broonie@linaro.org>
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