Commit 1c53e725 authored May 02, 2014 by Takashi Iwai

ALSA: usb-audio: Save mixer status only once at suspend

The suspend callback of usb-audio driver may be called multiple times
per suspend when multiple USB interfaces are bound to a single sound
card instance. In such a case, it's superfluous to save the mixer
values multiple times. This patch fixes it by checking the counter.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

parent b7a77235

sound/usb/card.c

+3 −2

Original line number	Diff line number	Diff line
		@@ -695,6 +695,7 @@ static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
		chip->autosuspended = 1;
		}

		if (chip->num_suspended_intf == 1)
		list_for_each_entry(mixer, &chip->mixer_list, list)
		snd_usb_mixer_suspend(mixer);