From: Takashi Iwai tiwai@suse.de
commit fb3c293b82c31a9a68fbcf4e7a45fadd8a47ea2b upstream.
The commit f274baa49be6 ("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: f274baa49be6 ("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 --- sound/usb/pcm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/sound/usb/pcm.c +++ b/sound/usb/pcm.c @@ -1885,7 +1885,7 @@ void snd_usb_preallocate_buffer(struct s { 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,