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sound: usb-audio: handle wMaxPacketSize for FIXED_ENDPOINT devices 

For audio devices that do not have proper audio descriptors (e.g.,
Edirol UA-20), we use hardcoded parameters from our quirks list.
However, we must still read the maximum packet size from the standard
endpoint descriptor; otherwise, we might use packets that are too big
and therefore rejected by the USB core.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Cc: <stable@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Clemens Ladisch 2009-02-06 08:13:07 +01:00 committed by Takashi Iwai
parent 18e352e4a7
commit 894dcd7878
1 changed files with 1 additions and 0 deletions
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sound/usb/usbaudio.c
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@ -2966,6 +2966,7 @@ static int create_fixed_stream_quirk(struct snd_usb_audio *chip,
return -EINVAL;
}
alts = &iface->altsetting[fp->altset_idx];
fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
usb_set_interface(chip->dev, fp->iface, 0);
init_usb_pitch(chip->dev, fp->iface, alts, fp);
init_usb_sample_rate(chip->dev, fp->iface, alts, fp, fp->rate_max);