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>
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@ -695,8 +695,9 @@ static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
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chip->autosuspended = 1;
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}
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list_for_each_entry(mixer, &chip->mixer_list, list)
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snd_usb_mixer_suspend(mixer);
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if (chip->num_suspended_intf == 1)
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list_for_each_entry(mixer, &chip->mixer_list, list)
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snd_usb_mixer_suspend(mixer);
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return 0;
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}
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