The current USB-audio driver gets an error at probing NUX MG-300 about parsing the clocks. This is because the firmware doesn't return the proper connection of the clock selector that is connected to a single clock; it's likely that the firmware was lazy^w optimized and the inquiry wasn't handled. Actually it makes little sense to inquire and set up the single connection explicitly.

This patch fixes the issue by simply skipping the clock selector inquiry if it's a single connection.

Reported-by: Mike Oliphant oliphant@nostatic.org Signed-off-by: Takashi Iwai tiwai@suse.de --- sound/usb/clock.c | 6 ++++++ 1 file changed, 6 insertions(+)

diff --git a/sound/usb/clock.c b/sound/usb/clock.c index dc68ed65e478..8243652d5604 100644 --- a/sound/usb/clock.c +++ b/sound/usb/clock.c @@ -298,6 +298,11 @@ static int __uac_clock_find_source(struct snd_usb_audio *chip, if (selector) { int ret, i, cur;

+ if (selector->bNrInPins == 1) { + ret = 1; + goto find_source; + } + /* the entity ID we are looking for is a selector. * find out what it currently selects */ ret = uac_clock_selector_get_val(chip, selector->bClockID); @@ -314,6 +319,7 @@ static int __uac_clock_find_source(struct snd_usb_audio *chip, return -EINVAL; }

+ find_source: cur = ret; ret = __uac_clock_find_source(chip, fmt, selector->baCSourceID[ret - 1],