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ALSA: usb-audio: fix regression for fixed stream quirk 

Commit 8f898e92ae removed the redundant
reads of bInterfaceProtocol from the descriptors, but introduced a
regression to devices with quirks of type QUIRK_AUDIO_FIXED_ENDPOINT,
since fp->protocol is not set in setup process.

As a consequence, audio streams would not get initialized, as the
following logs show:

[   48.923043] setting usb interface 3:1
[   48.923056] Creating new capture data endpoint #81
[   48.923484] 4:3:1: cannot set freq 48000 to ep 0x81

This patch sets fp->protocol in create_fixed_stream_quirk() and
resolves the regression.

Signed-off-by: Eldad Zack <eldad@fogrefinery.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Eldad Zack 2013-07-09 20:36:15 +02:00 committed by Takashi Iwai
parent cd63a5ffd2
commit 42d4ab832d
1 changed files with 4 additions and 0 deletions
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4
sound/usb/quirks.c
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@ -129,6 +129,7 @@ static int create_fixed_stream_quirk(struct snd_usb_audio *chip,
{
struct audioformat *fp;
struct usb_host_interface *alts;
struct usb_interface_descriptor *altsd;
int stream, err;
unsigned *rate_table = NULL;
@ -166,6 +167,9 @@ static int create_fixed_stream_quirk(struct snd_usb_audio *chip,
return -EINVAL;
}
alts = &iface->altsetting[fp->altset_idx];
altsd = get_iface_desc(alts);
fp->protocol = altsd->bInterfaceProtocol;
if (fp->datainterval == 0)
fp->datainterval = snd_usb_parse_datainterval(chip, alts);
if (fp->maxpacksize == 0)