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ALSA: pcm - Export snd_pcm_lib_default_mmap() helper

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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>
This commit is contained in:
Takashi Iwai 2011-09-28 17:12:59 +02:00
parent a597310331
commit 18a2b96233
2 changed files with 6 additions and 3 deletions
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2
include/sound/pcm.h
View 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

7
sound/core/pcm_native.c
View 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;