diff options
Diffstat (limited to 'sound/usb/endpoint.c')
| -rw-r--r-- | sound/usb/endpoint.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c index 6fbcb117555c..24cd7692bd01 100644 --- a/sound/usb/endpoint.c +++ b/sound/usb/endpoint.c @@ -1780,8 +1780,16 @@ static void snd_usb_handle_sync_urb(struct snd_usb_endpoint *ep, /* * skip empty packets. At least M-Audio's Fast Track Ultra stops * streaming once it received a 0-byte OUT URB + * + * However, on devices where bytes==0 means every sync-source + * packet errored (e.g. Behringer Flow 8 returning -EXDEV bursts + * for entire capture URBs), an unconditional return starves the + * IFB-fed OUT ring permanently. Such devices set + * QUIRK_FLAG_IFB_SILENCE_ON_EMPTY to fall through and enqueue a + * packet_info with size 0 packets, so playback emits silence + * and the OUT ring keeps moving. */ - if (bytes == 0) + if (bytes == 0 && !(ep->chip->quirk_flags & QUIRK_FLAG_IFB_SILENCE_ON_EMPTY)) return; spin_lock_irqsave(&ep->lock, flags); |