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Diffstat (limited to 'sound/usb/usbmixer.c')
-rw-r--r--sound/usb/usbmixer.c13
1 files changed, 11 insertions, 2 deletions
diff --git a/sound/usb/usbmixer.c b/sound/usb/usbmixer.c
index ec9cdf98692..df8969188d1 100644
--- a/sound/usb/usbmixer.c
+++ b/sound/usb/usbmixer.c
@@ -461,7 +461,7 @@ static int mixer_vol_tlv(struct snd_kcontrol *kcontrol, int op_flag,
unsigned int size, unsigned int __user *_tlv)
{
struct usb_mixer_elem_info *cval = kcontrol->private_data;
- DECLARE_TLV_DB_SCALE(scale, 0, 0, 0);
+ DECLARE_TLV_DB_MINMAX(scale, 0, 0);
if (size < sizeof(scale))
return -ENOMEM;
@@ -469,7 +469,16 @@ static int mixer_vol_tlv(struct snd_kcontrol *kcontrol, int op_flag,
* while ALSA TLV contains in 1/100 dB unit
*/
scale[2] = (convert_signed_value(cval, cval->min) * 100) / 256;
- scale[3] = (convert_signed_value(cval, cval->res) * 100) / 256;
+ scale[3] = (convert_signed_value(cval, cval->max) * 100) / 256;
+ if (scale[3] <= scale[2]) {
+ /* something is wrong; assume it's either from/to 0dB */
+ if (scale[2] < 0)
+ scale[3] = 0;
+ else if (scale[2] > 0)
+ scale[2] = 0;
+ else /* totally crap, return an error */
+ return -EINVAL;
+ }
if (copy_to_user(_tlv, scale, sizeof(scale)))
return -EFAULT;
return 0;