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Message-Id: <818893063ca19147075f2d1a966ff181a78e1869.1438699154.git.jslaby@suse.cz> Date: Tue, 4 Aug 2015 16:39:23 +0200 From: Jiri Slaby <jslaby@...e.cz> To: stable@...r.kernel.org Cc: linux-kernel@...r.kernel.org, Takashi Iwai <tiwai@...e.de>, Jiri Slaby <jslaby@...e.cz> Subject: [PATCH 3.12 019/123] ALSA: usb-audio: Save mixer status only once at suspend From: Takashi Iwai <tiwai@...e.de> 3.12-stable review patch. If anyone has any objections, please let me know. =============== commit 1c53e7253ed8769a00afa0f06777d731dbe1ba6f upstream. 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@...e.de> Signed-off-by: Jiri Slaby <jslaby@...e.cz> --- sound/usb/card.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/sound/usb/card.c b/sound/usb/card.c index 3ab9fc47da09..ca55e033cf9d 100644 --- a/sound/usb/card.c +++ b/sound/usb/card.c @@ -705,8 +705,9 @@ 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; } -- 2.5.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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