commit
3d839e5b87a70effc629c1cdbf77d837ef141919 upstream
Date: Tue, 26 Aug 2008 11:06:26 +0200
Subject: 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@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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);