ASoC: sst_platform: Fix lock acquring

Fix the possible dead lock shown below:

spin_lock
sst_get_stream_status
sst_period_elapsed
intel_sst_interrupt
handle_IRQ_event
handle_fasteoi_irq
do_IRQ
common_interrupt
spin_lock
sst_set_stream_status
sst_platform_pcm_trigger

Signed-off-by: Lu Guanqun <guanqun.lu@intel.com>
Acked-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 6 insertions, 4 deletions

diff --git a/sound/soc/mid-x86/sst_platform.c b/sound/soc/mid-x86/sst_platform.c
index ee2c22475a7..9ebe027f69e 100644
--- a/sound/soc/mid-x86/sst_platform.c
+++ b/sound/soc/mid-x86/sst_platform.c
@@ -116,18 +116,20 @@ struct snd_soc_dai_driver sst_platform_dai[] = {
 static inline void sst_set_stream_status(struct sst_runtime_stream *stream,
                                         int state)
 {
-        spin_lock(&stream->status_lock);
+        unsigned long flags;
+        spin_lock_irqsave(&stream->status_lock, flags);
         stream->stream_status = state;
-        spin_unlock(&stream->status_lock);
+        spin_unlock_irqrestore(&stream->status_lock, flags);
 }
 
 static inline int sst_get_stream_status(struct sst_runtime_stream *stream)
 {
         int state;
+        unsigned long flags;
 
-        spin_lock(&stream->status_lock);
+        spin_lock_irqsave(&stream->status_lock, flags);
         state = stream->stream_status;
-        spin_unlock(&stream->status_lock);
+        spin_unlock_irqrestore(&stream->status_lock, flags);
         return state;
 }