Merge branch 'topic/tlv-minmax' into for-linus

[pandora-kernel.git] / sound / usb / usbmixer.c

diff --git a/sound/usb/usbmixer.c b/sound/usb/usbmixer.c
index ec9cdf9..df89691 100644 (file)
--- 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;