From: Christoph Hellwig <hch@lst.de>
Date: Sat, 3 Aug 2019 10:31:59 +0000 (+0300)
Subject: ALSA: pcm: use dma_can_mmap() to check if a device supports dma_mmap_*
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=425da159707b;p=uclinux-h8%2Flinux.git

ALSA: pcm: use dma_can_mmap() to check if a device supports dma_mmap_*

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 <hch@lst.de>
Reviewed-by: Takashi Iwai <tiwai@suse.de>
---

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,