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Subject[PATCH] ALSA: usb-audio: add implicit fb quirk for Behringer UFX1204
Date
Add quirk to ensure a sync endpoint is properly configured.
This patch is a fix for same symptoms on Behringer UFX1204 as patch
from Albertto Aquirre on Dec 8 2016 for Axe-Fx II.

Signed-off-by: Lassi Ylikojola <lassi.ylikojola@gmail.com>
---
sound/usb/pcm.c | 9 +++++++++
1 file changed, 9 insertions(+)

diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index b9c9a19f9588..2d8b9e19e99b 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -352,6 +352,15 @@ static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs,
ep = 0x86;
iface = usb_ifnum_to_if(dev, 2);

+ if (!iface || iface->num_altsetting == 0)
+ return -EINVAL;
+
+ alts = &iface->altsetting[1];
+ goto add_sync_ep;
+ case USB_ID(0x1397, 0x0002): /* Behringer UFX1204 */
+ ep = 0x81;
+ iface = usb_ifnum_to_if(dev, 1);
+
if (!iface || iface->num_altsetting == 0)
return -EINVAL;

--
2.14.3
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