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ALSA: usb-audio: Fix PCM buffer allocation in non-vmalloc mode 

commit fb3c293b82c31a9a68fbcf4e7a45fadd8a47ea2b upstream.

The commit f274baa49b ("ALSA: usb-audio: Allow non-vmalloc buffer
for PCM buffers") introduced the mode to allocate coherent pages for
PCM buffers, and it used bus->controller device as its DMA device.
It turned out, however, that bus->sysdev is a more appropriate device
to be used for DMA mapping in HCD code.

This patch corrects the device reference accordingly.

Note that, on most platforms, both point to the very same device,
hence this patch doesn't change anything practically.  But on
platforms like xhcd-plat hcd, the change becomes effective.

Fixes: f274baa49b ("ALSA: usb-audio: Allow non-vmalloc buffer for PCM buffers")
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20210205144559.29555-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Takashi Iwai 2021-02-05 15:45:59 +01:00 committed by Greg Kroah-Hartman
parent 166f9bc8ca
commit d3b8fa2e1d
1 changed files with 1 additions and 1 deletions
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2
sound/usb/pcm.c
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@ -1885,7 +1885,7 @@ void snd_usb_preallocate_buffer(struct snd_usb_substream *subs)
{
struct snd_pcm *pcm = subs->stream->pcm;
struct snd_pcm_substream *s = pcm->streams[subs->direction].substream;
struct device *dev = subs->dev->bus->controller;
struct device *dev = subs->dev->bus->sysdev;
if (!snd_usb_use_vmalloc)
snd_pcm_lib_preallocate_pages(s, SNDRV_DMA_TYPE_DEV_SG,