diff options
Diffstat (limited to 'sound/usb/clock.c')
| -rw-r--r-- | sound/usb/clock.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/sound/usb/clock.c b/sound/usb/clock.c index 7754a103454..075195e8661 100644 --- a/sound/usb/clock.c +++ b/sound/usb/clock.c @@ -104,6 +104,15 @@ static bool uac_clock_source_is_valid(struct snd_usb_audio *chip, int source_id) int err; unsigned char data; struct usb_device *dev = chip->dev; + struct uac_clock_source_descriptor *cs_desc = + snd_usb_find_clock_source(chip->ctrl_intf, source_id); + + if (!cs_desc) + return 0; + + /* If a clock source can't tell us whether it's valid, we assume it is */ + if (!uac2_control_is_readable(cs_desc->bmControls, UAC2_CS_CONTROL_CLOCK_VALID)) + return 1; err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR, USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN, @@ -114,7 +123,7 @@ static bool uac_clock_source_is_valid(struct snd_usb_audio *chip, int source_id) if (err < 0) { snd_printk(KERN_WARNING "%s(): cannot get clock validity for id %d\n", __func__, source_id); - return err; + return 0; } return !!data; |