[patch 10/42] ALSA: oxygen: prevent muting of nonexistent AC97controls

[Greg KH]

2.6.26-stable review patch.  If anyone has any objections, please let us know.

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

From: Clemens Ladisch <clemens@xxxxxxxxxx>

commit 3d839e5b87a70effc629c1cdbf77d837ef141919 upstream

Date: Tue, 26 Aug 2008 11:06:26 +0200
Subject: [patch 10/42] ALSA: oxygen: prevent muting of nonexistent AC97 controls

The Xonar DX does not have CD Capture controls, so we have to check that
a control actually exists before muting it.

Signed-off-by: Clemens Ladisch <clemens@xxxxxxxxxx>
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 sound/pci/oxygen/oxygen_mixer.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/sound/pci/oxygen/oxygen_mixer.c
+++ b/sound/pci/oxygen/oxygen_mixer.c
@@ -512,9 +512,12 @@ static int ac97_switch_get(struct snd_kc
 
 static void mute_ac97_ctl(struct oxygen *chip, unsigned int control)
 {
-	unsigned int priv_idx = chip->controls[control]->private_value & 0xff;
+	unsigned int priv_idx;
 	u16 value;
 
+	if (!chip->controls[control])
+		return;
+	priv_idx = chip->controls[control]->private_value & 0xff;
 	value = oxygen_read_ac97(chip, 0, priv_idx);
 	if (!(value & 0x8000)) {
 		oxygen_write_ac97(chip, 0, priv_idx, value | 0x8000);

-- 
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