From d132cb0a162fa55c82e06b771fcaa871d30c9398 Mon Sep 17 00:00:00 2001
From: Wenkai Du <wenkai.du@intel.com>
Date: Wed, 23 Apr 2014 13:29:30 +0300
Subject: [PATCH] ASoC: Intel: Fix audio crash due to race condition in stream
 deletion

There is a race between sst_byt_stream_free() and sst_byt_get_stream()
if sst_byt_get_stream() called from sst_byt_irq_thread() context is
accessing the byt->stream_list while a stream is deleted from the list.

A stream is added to byt->stream_list in sst_byt_stream_new() and deleted in
sst_byt_stream_free(). sst_byt_get_stream() is always protected by
sst->spinlock, but the stream addition and deletion are not protected.

The patch adds spinlock to both stream addition and deletion.

[Jarkko: Same fix added to sst-haswell-ipc.c too]

Signed-off-by: Wenkai Du <wenkai.du@intel.com>
Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
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