linux-kernel - [PATCH 3.16.y-ckt 012/129] ALSA: hda

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Date:	Fri, 22 May 2015 09:56:37 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Takashi Iwai <tiwai@...e.de>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 012/129] ALSA: hda - Fix mute-LED fixed mode

3.16.7-ckt12 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Takashi Iwai <tiwai@...e.de>

commit ee52e56e7b12834476cd0031c5986254ba1b6317 upstream.

The mute-LED mode control has the fixed on/off states that are
supposed to remain on/off regardless of the master switch.  However,
this doesn't work actually because the vmaster hook is called in the
vmaster code itself.

This patch fixes it by calling the hook indirectly after checking the
mute LED mode.

Reported-and-tested-by: Pali Rohár <pali.rohar@...il.com>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
[ luis: backported to 3.16: adjusted context ]
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 sound/pci/hda/hda_codec.c | 21 ++++++++++++---------
 1 file changed, 12 insertions(+), 9 deletions(-)

diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index fb9497a0062a..68bea67c3ca3 100644
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -2942,6 +2942,16 @@ static struct snd_kcontrol_new vmaster_mute_mode = {
 	.put = vmaster_mute_mode_put,
 };
 
+/* meta hook to call each driver's vmaster hook */
+static void vmaster_hook(void *private_data, int enabled)
+{
+	struct hda_vmaster_mute_hook *hook = private_data;
+
+	if (hook->mute_mode != HDA_VMUTE_FOLLOW_MASTER)
+		enabled = hook->mute_mode;
+	hook->hook(hook->codec, enabled);
+}
+
 /*
  * Add a mute-LED hook with the given vmaster switch kctl
  * "Mute-LED Mode" control is automatically created and associated with
@@ -2955,9 +2965,9 @@ int snd_hda_add_vmaster_hook(struct hda_codec *codec,
 
 	if (!hook->hook || !hook->sw_kctl)
 		return 0;
-	snd_ctl_add_vmaster_hook(hook->sw_kctl, hook->hook, codec);
 	hook->codec = codec;
 	hook->mute_mode = HDA_VMUTE_FOLLOW_MASTER;
+	snd_ctl_add_vmaster_hook(hook->sw_kctl, vmaster_hook, hook);
 	if (!expose_enum_ctl)
 		return 0;
 	kctl = snd_ctl_new1(&vmaster_mute_mode, hook);
@@ -2980,14 +2990,7 @@ void snd_hda_sync_vmaster_hook(struct hda_vmaster_mute_hook *hook)
 	 */
 	if (hook->codec->bus->shutdown)
 		return;
-	switch (hook->mute_mode) {
-	case HDA_VMUTE_FOLLOW_MASTER:
-		snd_ctl_sync_vmaster_hook(hook->sw_kctl);
-		break;
-	default:
-		hook->hook(hook->codec, hook->mute_mode);
-		break;
-	}
+	snd_ctl_sync_vmaster_hook(hook->sw_kctl);
 }
 EXPORT_SYMBOL_GPL(snd_hda_sync_vmaster_hook);
 
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