[bug report] ASoC: codecs: pcm6240: Use guard() for mutex locks

[Dan Carpenter <error27@gmail.com>]

Hello bui duc phuc,

Commit f3da3b7f6ed2 ("ASoC: codecs: pcm6240: Use guard() for mutex
locks") from Jul 21, 2026 (linux-next), leads to the following Smatch
static checker warning:

	sound/soc/codecs/pcm6240.c:623 pcmdev_get_volsw()
	warn: missing error code? 'ret'

sound/soc/codecs/pcm6240.c
    594 static int pcmdev_get_volsw(struct snd_kcontrol *kcontrol,
    595         struct snd_ctl_elem_value *ucontrol, int vol_ctrl_type)
    596 {
    597         struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
    598         struct pcmdevice_priv *pcm_dev =
    599                 snd_soc_component_get_drvdata(component);
    600         struct pcmdevice_mixer_control *mc =
    601                 (struct pcmdevice_mixer_control *)kcontrol->private_value;
    602         int max = mc->max, ret;
    603         unsigned int mask = BIT(fls(max)) - 1;
    604         unsigned int dev_no = mc->dev_no;
    605         unsigned int shift = mc->shift;
    606         unsigned int reg = mc->reg;
    607         unsigned int val;
    608 
    609         guard(mutex)(&pcm_dev->codec_lock);
    610 
    611         if (pcm_dev->chip_id == PCM1690) {
    612                 ret = pcmdev_dev_read(pcm_dev, dev_no, PCM1690_REG_MODE_CTRL,
    613                         &val);
    614                 if (ret) {
    615                         dev_err(pcm_dev->dev, "%s: read mode err=%d\n",
    616                                 __func__, ret);
    617                         return ret;
    618                 }
    619                 val &= PCM1690_REG_MODE_CTRL_DAMS_MSK;
    620                 /* Set to wide-range mode, before using vol ctrl. */
    621                 if (!val && vol_ctrl_type == PCMDEV_PCM1690_VOL_CTRL) {
    622                         ucontrol->value.integer.value[0] = -25500;
--> 623                         return ret;

This was intentional, but it would be better to "return 0;" here.

    624                 }
    625                 /* Set to fine mode, before using fine vol ctrl. */
    626                 if (val && vol_ctrl_type == PCMDEV_PCM1690_FINE_VOL_CTRL) {
    627                         ucontrol->value.integer.value[0] = -12750;
    628                         return ret;

Same here.

    629                 }
    630         }
    631 
    632         ret = pcmdev_dev_read(pcm_dev, dev_no, reg, &val);
    633         if (ret) {
    634                 dev_err(pcm_dev->dev, "%s: read err=%d\n",
    635                         __func__, ret);
    636                 return ret;
    637         }
    638 
    639         val = (val >> shift) & mask;
    640         val = (val > max) ? max : val;
    641         val = mc->invert ? max - val : val;
    642         ucontrol->value.integer.value[0] = val;
    643 
    644         return ret;

And here.

    645 }

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regards,
dan carpenter