Patch "ALSA: hda - Fix path power activation" has been added to the 4.1-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    ALSA: hda - Fix path power activation

to the 4.1-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     alsa-hda-fix-path-power-activation.patch
and it can be found in the queue-4.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From c7cd0ef66aade29e37ee08821a0e195ee776c6e6 Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai@suse.de>
Date: Mon, 24 Aug 2015 10:52:06 +0200
Subject: ALSA: hda - Fix path power activation

From: Takashi Iwai <tiwai@suse.de>

commit c7cd0ef66aade29e37ee08821a0e195ee776c6e6 upstream.

The widget power-saving code tries to turn up/down the power of each
widget in the I/O paths that are modified at each jack plug/unplug.
The recent report revealed that the power activation leaves some
widgets unpowered after plugging.  This is because
snd_hda_activate_path() turns on path->active flag at the end of the
function while the path power management is done before that.  Then
it's regarded as if nothing is active, and the driver turns off the
power.

The fix is simply to set the flag at the beginning of the function,
before trying to power up.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=102521
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 sound/pci/hda/hda_generic.c |    6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

--- a/sound/pci/hda/hda_generic.c
+++ b/sound/pci/hda/hda_generic.c
@@ -884,8 +884,7 @@ void snd_hda_activate_path(struct hda_co
 	struct hda_gen_spec *spec = codec->spec;
 	int i;
 
-	if (!enable)
-		path->active = false;
+	path->active = enable;
 
 	/* make sure the widget is powered up */
 	if (enable && (spec->power_down_unused || codec->power_save_node))
@@ -903,9 +902,6 @@ void snd_hda_activate_path(struct hda_co
 		if (has_amp_out(codec, path, i))
 			activate_amp_out(codec, path, i, enable);
 	}
-
-	if (enable)
-		path->active = true;
 }
 EXPORT_SYMBOL_GPL(snd_hda_activate_path);
 


Patches currently in stable-queue which might be from tiwai@suse.de are

queue-4.1/alsa-hda-fix-possible-null-dereference.patch
queue-4.1/alsa-hda-fix-the-white-noise-on-dell-laptop.patch
queue-4.1/alsa-usb-add-native-dsd-support-for-gustard-dac-x20u.patch
queue-4.1/alsa-hda-fix-path-power-activation.patch
queue-4.1/alsa-hda-check-all-inputs-for-is_active_nid_for_any.patch
queue-4.1/alsa-usb-audio-fix-runtime-pm-unbalance.patch
queue-4.1/alsa-hda-shutdown-cx20722-on-reboot-free-to-avoid-spurious-noises.patch