ALSA: pcm - Export snd_pcm_lib_default_mmap() helper
Takashi Iwai [Wed, 28 Sep 2011 15:12:59 +0000 (17:12 +0200)]
Export the default mmap function, snd_pcm_lib_default_mmap().
The upcoming non-snooping support in HD-audio driver will use this
to override the mmap method.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

include/sound/pcm.h
sound/core/pcm_native.c

index 57e71fa..249d988 100644 (file)
@@ -1035,6 +1035,8 @@ static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
        atomic_dec(&substream->mmap_count);
 }
 
+int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
+                            struct vm_area_struct *area);
 /* mmap for io-memory area */
 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
 #define SNDRV_PCM_INFO_MMAP_IOMEM      SNDRV_PCM_INFO_MMAP
index 1c6be91..b4bf4a4 100644 (file)
@@ -3156,8 +3156,8 @@ static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
 /*
  * mmap the DMA buffer on RAM
  */
-static int snd_pcm_default_mmap(struct snd_pcm_substream *substream,
-                               struct vm_area_struct *area)
+int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
+                            struct vm_area_struct *area)
 {
        area->vm_flags |= VM_RESERVED;
 #ifdef ARCH_HAS_DMA_MMAP_COHERENT
@@ -3177,6 +3177,7 @@ static int snd_pcm_default_mmap(struct snd_pcm_substream *substream,
        area->vm_ops = &snd_pcm_vm_ops_data_fault;
        return 0;
 }
+EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
 
 /*
  * mmap the DMA buffer on I/O memory area
@@ -3242,7 +3243,7 @@ int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
        if (substream->ops->mmap)
                err = substream->ops->mmap(substream, area);
        else
-               err = snd_pcm_default_mmap(substream, area);
+               err = snd_pcm_lib_default_mmap(substream, area);
        if (!err)
                atomic_inc(&substream->mmap_count);
        return err;