ALSA: vmalloc buffers should use normal mmap (3674f19d) · Commits · 戴 / test

It's a big no-no to use pgprot_noncached() when mmap'ing such buffers into userspace since they are mapped cachable in kernel space. This can cause all sort of interesting things ranging from to garbled sound to lockups on various architectures. I've observed that usb-audio is broken on powerpc 4xx for example because of that. Also remove the now unused snd_pcm_lib_mmap_noncached(). It's an arch business to know when to use uncached mappings, there's already hacks for MIPS inside snd_pcm_default_mmap() and other archs are supposed to use dma_mmap_coherent(). (See my separate patch that adds dma_mmap_coherent() to powerpc) Signed-off-by:

Benjamin Herrenschmidt <benh@kernel.crashing.org> CC: <stable@kernel.org> Signed-off-by:

Takashi Iwai <tiwai@suse.de>

include/sound/pcm.h

+1 −3

Original line number	Diff line number	Diff line
		@@ -1031,9 +1031,7 @@ int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_s
		#define snd_pcm_lib_mmap_iomem NULL
		#endif

		int snd_pcm_lib_mmap_noncached(struct snd_pcm_substream *substream,
		struct vm_area_struct *area);
		#define snd_pcm_lib_mmap_vmalloc snd_pcm_lib_mmap_noncached
		#define snd_pcm_lib_mmap_vmalloc NULL

		static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
		{

sound/core/pcm_native.c

+0 −9

Original line number	Diff line number	Diff line
		@@ -3201,15 +3201,6 @@ int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
		EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
		#endif /* SNDRV_PCM_INFO_MMAP */

		/* mmap callback with pgprot_noncached */
		int snd_pcm_lib_mmap_noncached(struct snd_pcm_substream *substream,
		struct vm_area_struct *area)
		{
		area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
		return snd_pcm_default_mmap(substream, area);
		}
		EXPORT_SYMBOL(snd_pcm_lib_mmap_noncached);

		/*
		* mmap DMA buffer
		*/

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