ASoC: dapm: Fix uninitialized variable in snd_soc_dapm_get_enum_double()

If soc_dapm_read() fails, reg_val will be uninitialized, and bogus
values will be written later:

sound/soc/soc-dapm.c: In function 'snd_soc_dapm_get_enum_double':
sound/soc/soc-dapm.c:2862:15: warning: 'reg_val' may be used uninitialized in this function [-Wmaybe-uninitialized]
  unsigned int reg_val, val;
               ^

Return early on error to fix this.

Introduced by commit ce0fc93ae56e2ba50ff8c220d69e4e860e889320 ("ASoC:
Add DAPM support at the component level").

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Mark Brown <broonie@linaro.org>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>

diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index 8348352..177bd86 100644 (file)
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -2860,12 +2860,14 @@ int snd_soc_dapm_get_enum_double(struct snd_kcontrol *kcontrol,
        struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kcontrol);
        struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
        unsigned int reg_val, val;
-       int ret = 0;
 
-       if (e->reg != SND_SOC_NOPM)
-               ret = soc_dapm_read(dapm, e->reg, &reg_val);
-       else
+       if (e->reg != SND_SOC_NOPM) {
+               int ret = soc_dapm_read(dapm, e->reg, &reg_val);
+               if (ret)
+                       return ret;
+       } else {
                reg_val = dapm_kcontrol_get_value(kcontrol);
+       }
 
        val = (reg_val >> e->shift_l) & e->mask;
        ucontrol->value.enumerated.item[0] = snd_soc_enum_val_to_item(e, val);
@@ -2875,7 +2877,7 @@ int snd_soc_dapm_get_enum_double(struct snd_kcontrol *kcontrol,
                ucontrol->value.enumerated.item[1] = val;
        }
 
-       return ret;
+       return 0;
 }
 EXPORT_SYMBOL_GPL(snd_soc_dapm_get_enum_double);