ALSA: usb-audio: assume valid clock
If the interface can't report a clock's validity, assume that it's
valid.
Signed-off-by: Daniel Mack <zonque@gmail.com>
Reported-by: Vicente Joel <vicentejoel@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/usb/clock.c b/sound/usb/clock.c
index 7754a10..075195e 100644
--- a/sound/usb/clock.c
+++ b/sound/usb/clock.c
@@ -104,6 +104,15 @@
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 @@
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;
