ALSA: snd-usb: Accept UAC2 FORMAT_TYPE descriptors with bLength > 6

The Focusrite Scarlett 18i6 USB has them that way, which is probably a
bug. Anyway, the driver should simply ignore this fact.

Signed-off-by: Daniel Mack <zonque@gmail.com>
Reported-by: Nicolai Krakowiak <nicolai.krakowiak@gmail.com>
Cc: stable@kernel.org
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c
index 7c0d21e..7d46e48 100644 (file)
--- a/sound/usb/endpoint.c
+++ b/sound/usb/endpoint.c
@@ -352,7 +352,7 @@ int snd_usb_parse_audio_endpoints(struct snd_usb_audio *chip, int iface_no)
                        continue;
                }
                if (((protocol == UAC_VERSION_1) && (fmt->bLength < 8)) ||
-                   ((protocol == UAC_VERSION_2) && (fmt->bLength != 6))) {
+                   ((protocol == UAC_VERSION_2) && (fmt->bLength < 6))) {
                        snd_printk(KERN_ERR "%d:%u:%d : invalid UAC_FORMAT_TYPE desc\n",
                                   dev->devnum, iface_no, altno);
                        continue;