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

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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>
This commit is contained in:
Takashi Iwai 2014-05-02 18:14:42 +02:00
parent b7a7723513
commit 1c53e7253e
1 changed files with 3 additions and 2 deletions
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5
sound/usb/card.c
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@ -695,8 +695,9 @@ static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
chip->autosuspended = 1;
}
list_for_each_entry(mixer, &chip->mixer_list, list)
snd_usb_mixer_suspend(mixer);
if (chip->num_suspended_intf == 1)
list_for_each_entry(mixer, &chip->mixer_list, list)
snd_usb_mixer_suspend(mixer);
return 0;
}