1 files changed, 42 insertions, 5 deletions

diff --git a/include/sound/pcm.h b/include/sound/pcm.h
index 938f36050a5e..33451f8ff755 100644
--- a/include/sound/pcm.h
+++ b/include/sound/pcm.h
@@ -1204,11 +1204,48 @@ void snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);
 
-void snd_pcm_set_managed_buffer(struct snd_pcm_substream *substream, int type,
-				struct device *data, size_t size, size_t max);
-void snd_pcm_set_managed_buffer_all(struct snd_pcm *pcm, int type,
-				    struct device *data,
-				    size_t size, size_t max);
+int snd_pcm_set_managed_buffer(struct snd_pcm_substream *substream, int type,
+			       struct device *data, size_t size, size_t max);
+int snd_pcm_set_managed_buffer_all(struct snd_pcm *pcm, int type,
+				   struct device *data,
+				   size_t size, size_t max);
+
+/**
+ * snd_pcm_set_fixed_buffer - Preallocate and set up the fixed size PCM buffer
+ * @substream: the pcm substream instance
+ * @type: DMA type (SNDRV_DMA_TYPE_*)
+ * @data: DMA type dependent data
+ * @size: the requested pre-allocation size in bytes
+ *
+ * This is a variant of snd_pcm_set_managed_buffer(), but this pre-allocates
+ * only the given sized buffer and doesn't allow re-allocation nor dynamic
+ * allocation of a larger buffer unlike the standard one.
+ * The function may return -ENOMEM error, hence the caller must check it.
+ */
+static inline int __must_check
+snd_pcm_set_fixed_buffer(struct snd_pcm_substream *substream, int type,
+				 struct device *data, size_t size)
+{
+	return snd_pcm_set_managed_buffer(substream, type, data, size, 0);
+}
+
+/**
+ * snd_pcm_set_fixed_buffer_all - Preallocate and set up the fixed size PCM buffer
+ * @pcm: the pcm instance
+ * @type: DMA type (SNDRV_DMA_TYPE_*)
+ * @data: DMA type dependent data
+ * @size: the requested pre-allocation size in bytes
+ *
+ * Apply the set up of the fixed buffer via snd_pcm_set_fixed_buffer() for
+ * all substream.  If any of allocation fails, it returns -ENOMEM, hence the
+ * caller must check the return value.
+ */
+static inline int __must_check
+snd_pcm_set_fixed_buffer_all(struct snd_pcm *pcm, int type,
+			     struct device *data, size_t size)
+{
+	return snd_pcm_set_managed_buffer_all(pcm, type, data, size, 0);
+}
 
 int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream,
 				      size_t size, gfp_t gfp_flags);