From 7b8a043f2686af9f41e313a78ed5e98233e5fded Mon Sep 17 00:00:00 2001 From: Daniel Mack Date: Mon, 22 Feb 2010 23:49:12 +0100 Subject: [PATCH] ALSA: usbmixer: bail out early when parsing audio class v2 descriptors This is just a quick hack that needs to be removed once the new units defined by the audio class v2.0 standard are supported. However, it allows using these devices for now, without mixer support. Signed-off-by: Daniel Mack Signed-off-by: Takashi Iwai --- sound/usb/usbmixer.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/sound/usb/usbmixer.c b/sound/usb/usbmixer.c index ca79495..42bb95c 100644 --- a/sound/usb/usbmixer.c +++ b/sound/usb/usbmixer.c @@ -2258,7 +2258,8 @@ int snd_usb_create_mixer(struct snd_usb_audio *chip, int ctrlif, }; struct usb_mixer_interface *mixer; struct snd_info_entry *entry; - int err; + struct usb_host_interface *host_iface; + int err, protocol; strcpy(chip->card->mixername, "USB Mixer"); @@ -2275,6 +2276,16 @@ int snd_usb_create_mixer(struct snd_usb_audio *chip, int ctrlif, return -ENOMEM; } + host_iface = &usb_ifnum_to_if(chip->dev, ctrlif)->altsetting[0]; + protocol = host_iface->desc.bInterfaceProtocol; + + /* FIXME! */ + if (protocol != UAC_VERSION_1) { + snd_printk(KERN_WARNING "mixer interface protocol 0x%02x not yet supported\n", + protocol); + return 0; + } + if ((err = snd_usb_mixer_controls(mixer)) < 0 || (err = snd_usb_mixer_status_create(mixer)) < 0) goto _error; -- 2.7.4