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-rw-r--r--include/sound/pcm.h15
1 files changed, 15 insertions, 0 deletions
diff --git a/include/sound/pcm.h b/include/sound/pcm.h
index 9b187d86e1bd..36da42cd0774 100644
--- a/include/sound/pcm.h
+++ b/include/sound/pcm.h
@@ -617,6 +617,7 @@ void snd_pcm_stream_unlock(struct snd_pcm_substream *substream);
void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream);
void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream);
unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream);
+unsigned long _snd_pcm_stream_lock_irqsave_nested(struct snd_pcm_substream *substream);
/**
* snd_pcm_stream_lock_irqsave - Lock the PCM stream
@@ -636,6 +637,20 @@ void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
unsigned long flags);
/**
+ * snd_pcm_stream_lock_irqsave_nested - Single-nested PCM stream locking
+ * @substream: PCM substream
+ * @flags: irq flags
+ *
+ * This locks the PCM stream like snd_pcm_stream_lock_irqsave() but with
+ * the single-depth lockdep subclass.
+ */
+#define snd_pcm_stream_lock_irqsave_nested(substream, flags) \
+ do { \
+ typecheck(unsigned long, flags); \
+ flags = _snd_pcm_stream_lock_irqsave_nested(substream); \
+ } while (0)
+
+/**
* snd_pcm_group_for_each_entry - iterate over the linked substreams
* @s: the iterator
* @substream: the substream