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>

1 files changed, 7 insertions, 5 deletions

diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index 8348352dc2c6..177bd8639ef9 100644
--- 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);