# \[PATCH 5/8\] ALSA: pcm: use dma\_can\_mmap() to check if a device supports dma\_mmap\_\* - From: Christoph Hellwig \ - Date: 2019-08-08 16:00:54 - List: linuxppc-dev - Page: https://ratatoskr.run/linuxppc-dev/2019/08/5681968 - Thread: https://ratatoskr.run/linux-arm-kernel/2019/08/5681963/t.md ```text Replace the local hack with the dma_can_mmap helper to check if a given device supports mapping DMA allocations to userspace. Signed-off-by: Christoph Hellwig Reviewed-by: Takashi Iwai --- sound/core/pcm_native.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c index 703857aab00f..9763c18e176a 100644 --- a/sound/core/pcm_native.c +++ b/sound/core/pcm_native.c @@ -220,13 +220,12 @@ static bool hw_support_mmap(struct snd_pcm_substream *substream) { if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP)) return false; - /* architecture supports dma_mmap_coherent()? */ -#if defined(CONFIG_ARCH_NO_COHERENT_DMA_MMAP) || !defined(CONFIG_HAS_DMA) - if (!substream->ops->mmap && - substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) - return false; -#endif - return true; + + if (substream->ops->mmap || + substream->dma_buffer.dev.type != SNDRV_DMA_TYPE_DEV) + return true; + + return dma_can_mmap(substream->dma_buffer.dev.dev); } static int constrain_mask_params(struct snd_pcm_substream *substream, -- 2.20.1 ```