diff options
| -rw-r--r-- | drivers/media/usb/em28xx/em28xx-audio.c | 42 |
1 files changed, 22 insertions, 20 deletions
diff --git a/drivers/media/usb/em28xx/em28xx-audio.c b/drivers/media/usb/em28xx/em28xx-audio.c index f75c0a5494d6..c1937ea1fca3 100644 --- a/drivers/media/usb/em28xx/em28xx-audio.c +++ b/drivers/media/usb/em28xx/em28xx-audio.c @@ -273,26 +273,28 @@ static int snd_em28xx_capture_open(struct snd_pcm_substream *substream) mutex_lock(&dev->lock); runtime->hw = snd_em28xx_hw_capture; - if ((dev->alt == 0 || dev->is_audio_only) && dev->adev.users == 0) { - if (dev->is_audio_only) - /* vendor audio is on a separate interface */ - dev->alt = 1; - else - /* vendor audio is on the same interface as video */ - dev->alt = 7; - /* - * FIXME: The intention seems to be to select the alt - * setting with the largest wMaxPacketSize for the video - * endpoint. - * At least dev->alt should be used instead, but we - * should probably not touch it at all if it is - * already >0, because wMaxPacketSize of the audio - * endpoints seems to be the same for all. - */ - - dprintk("changing alternate number on interface %d to %d\n", - dev->ifnum, dev->alt); - usb_set_interface(dev->udev, dev->ifnum, dev->alt); + + if (dev->adev.users == 0) { + if (dev->alt == 0 || dev->is_audio_only) { + if (dev->is_audio_only) + /* audio is on a separate interface */ + dev->alt = 1; + else + /* audio is on the same interface as video */ + dev->alt = 7; + /* + * FIXME: The intention seems to be to select + * the alt setting with the largest + * wMaxPacketSize for the video endpoint. + * At least dev->alt should be used instead, but + * we should probably not touch it at all if it + * is already >0, because wMaxPacketSize of the + * audio endpoints seems to be the same for all. + */ + dprintk("changing alternate number on interface %d to %d\n", + dev->ifnum, dev->alt); + usb_set_interface(dev->udev, dev->ifnum, dev->alt); + } /* Sets volume, mute, etc */ dev->mute = 0; |