ALSA: pcm - Call pgprot_noncached() for vmalloc'ed buffers

pgprot_noncached() can be set for vmalloc'ed buffers safely, and we'd
need non-cached behavior more or less, even for the intermediate ring-
buffers.

Now snd_pcm_lib_mmap_vmalloc() is added as the common PCM mmap callback
that is coupled with snd_pcm_lib_alloc_vmalloc_buffer() & co.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

2 files changed, 4 insertions, 0 deletions

diff --git a/sound/usb/ua101.c b/sound/usb/ua101.c
index 16dc7bd5e120..4f4ccdf70dd0 100644
--- a/sound/usb/ua101.c
+++ b/sound/usb/ua101.c
@@ -911,6 +911,7 @@ static struct snd_pcm_ops capture_pcm_ops = {
         .trigger = capture_pcm_trigger,
         .pointer = capture_pcm_pointer,
         .page = snd_pcm_lib_get_vmalloc_page,
+        .mmap = snd_pcm_lib_mmap_vmalloc,
 };
 
 static struct snd_pcm_ops playback_pcm_ops = {
@@ -923,6 +924,7 @@ static struct snd_pcm_ops playback_pcm_ops = {
         .trigger = playback_pcm_trigger,
         .pointer = playback_pcm_pointer,
         .page = snd_pcm_lib_get_vmalloc_page,
+        .mmap = snd_pcm_lib_mmap_vmalloc,
 };
 
 static const struct uac_format_type_i_discrete_descriptor *
diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c
index 4ada98e16309..b8e0b8fda607 100644
--- a/sound/usb/usbaudio.c
+++ b/sound/usb/usbaudio.c
@@ -1997,6 +1997,7 @@ static struct snd_pcm_ops snd_usb_playback_ops = {
         .trigger =      snd_usb_pcm_playback_trigger,
         .pointer =      snd_usb_pcm_pointer,
         .page =         snd_pcm_lib_get_vmalloc_page,
+        .mmap =         snd_pcm_lib_mmap_vmalloc,
 };
 
 static struct snd_pcm_ops snd_usb_capture_ops = {
@@ -2009,6 +2010,7 @@ static struct snd_pcm_ops snd_usb_capture_ops = {
         .trigger =      snd_usb_pcm_capture_trigger,
         .pointer =      snd_usb_pcm_pointer,
         .page =         snd_pcm_lib_get_vmalloc_page,
+        .mmap =         snd_pcm_lib_mmap_vmalloc,
 };