提交 9eb4a067 编写于 作者: T Takashi Iwai

ALSA: pcm - define snd_pcm_default_page_ops()

Add a helper (inline) function as the default page ops.  Any hacks wrt
the page address conversion will be applied in this function.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>
上级 657b1989
......@@ -3062,6 +3062,13 @@ static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file
}
#endif /* coherent mmap */
static inline struct page *
snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
{
void *vaddr = substream->runtime->dma_area + ofs;
return virt_to_page(vaddr);
}
/*
* fault callback for mmapping a RAM page
*/
......@@ -3072,7 +3079,6 @@ static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
struct snd_pcm_runtime *runtime;
unsigned long offset;
struct page * page;
void *vaddr;
size_t dma_bytes;
if (substream == NULL)
......@@ -3082,14 +3088,12 @@ static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
if (offset > dma_bytes - PAGE_SIZE)
return VM_FAULT_SIGBUS;
if (substream->ops->page) {
if (substream->ops->page)
page = substream->ops->page(substream, offset);
if (!page)
return VM_FAULT_SIGBUS;
} else {
vaddr = runtime->dma_area + offset;
page = virt_to_page(vaddr);
}
else
page = snd_pcm_default_page_ops(substream, offset);
if (!page)
return VM_FAULT_SIGBUS;
get_page(page);
vmf->page = page;
return 0;
......
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