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26f98e82 Thu Feb 28 07:19:23 CST 2019 Olivier Moysan <olivier.moysan@st.com> ASoC: stm32: sai: fix race condition in irq handlerWhen snd_pcm_stop_xrun() is called in interrupt routine,substream context may have already been released.Add protection on substream context.Signed-off-by: Olivier Moysan <olivier.moysan@st.com>Signed-off-by: Mark Brown <broonie@kernel.org>