From 3d839e5b87a70effc629c1cdbf77d837ef141919 Mon Sep 17 00:00:00 2001 From: Clemens Ladisch Date: Tue, 26 Aug 2008 11:06:26 +0200 Subject: [PATCH] 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 Cc: Signed-off-by: Takashi Iwai --- sound/pci/oxygen/oxygen_mixer.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/sound/pci/oxygen/oxygen_mixer.c b/sound/pci/oxygen/oxygen_mixer.c index 6facac5aed90..05eb8994c141 100644 --- 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_kcontrol *ctl, 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); -- 2.20.1