ALSA: usb-audio: Fix PCM buffer allocation in non-vmalloc mode
authorTakashi Iwai <tiwai@suse.de>
Fri, 5 Feb 2021 14:45:59 +0000 (15:45 +0100)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 4 Mar 2021 10:37:18 +0000 (11:37 +0100)
commite18368d0515db9fb2a47375b883009a3c94b650c
treed55d015739265146846226587e1c1bf42c99b64d
parent89e3d1a85df80de70239582f44c91ed943f50006
ALSA: usb-audio: Fix PCM buffer allocation in non-vmalloc mode

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