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| author |   Takashi Iwai <tiwai@suse.de> | 2021-07-15 09:58:23 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2021-07-19 16:16:32 +0200 |
| commit | 427ae2689db0fb6377e39e63fae2991223cdd9e7 (patch) | |
| tree | 0fa5ba3ebbea76a54a6df1547c11dfe4a8bafa1e /include/sound/memalloc.h | |
| parent | ALSA: aloop: Fix spelling mistake "synchronization" -> "synchronization" (diff) | |
| download | linux-dev-427ae2689db0fb6377e39e63fae2991223cdd9e7.tar.xz linux-dev-427ae2689db0fb6377e39e63fae2991223cdd9e7.zip | |
ALSA: core: Add device-managed page allocator helper
This is a preparation for allowing devres usages more widely in
various sound drivers. As a first step, this patch adds a new
allocator function, snd_devm_alloc_pages(), to manage the allocated
pages via devres, so that the pages will be automagically released as
device unbinding.
Unlike the old snd_dma_alloc_pages(), the new function returns
directly the snd_dma_buffer pointer. The caller needs NULL-check for
the allocation error appropriately.
Also, since a real device pointer is mandatory for devres,
SNDRV_DMA_TYPE_CONTINUOUS or SNDRV_DMA_TYPE_VMALLOC type can't be used
for this function.
Link: https://lore.kernel.org/r/20210715075941.23332-2-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'include/sound/memalloc.h')
| -rw-r--r-- | include/sound/memalloc.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/sound/memalloc.h b/include/sound/memalloc.h index 44d87775b352..d22c9387b2ba 100644 --- a/include/sound/memalloc.h +++ b/include/sound/memalloc.h @@ -79,5 +79,9 @@ struct page *snd_sgbuf_get_page(struct snd_dma_buffer *dmab, size_t offset); unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab, unsigned int ofs, unsigned int size); +/* device-managed memory allocator */ +struct snd_dma_buffer *snd_devm_alloc_pages(struct device *dev, int type, + size_t size); + #endif /* __SOUND_MEMALLOC_H */ |