[PATCH] ALSA: mips: avoid potential uninitialized variable use

[Arnd Bergmann]

MIPS allmodconfig results in this warning:

sound/mips/hal2.c: In function 'hal2_gain_get':
sound/mips/hal2.c:224:35: error: 'r' may be used uninitialized in this function 
[-Werror=maybe-uninitialized]
sound/mips/hal2.c:223:35: error: 'l' may be used uninitialized in this function 
[-Werror=maybe-uninitialized]
sound/mips/hal2.c: In function 'hal2_gain_put':
sound/mips/hal2.c:260:13: error: 'new' may be used uninitialized in this 
function [-Werror=maybe-uninitialized]
sound/mips/hal2.c:260:13: error: 'old' may be used uninitialized in this 
function [-Werror=maybe-uninitialized]

It's easy enough to avoid by adding a 'default' clause to the switch
statements here. I assume that in practice no other case can happen,
but adding a default puts us on the safe side and shuts up the warnings.

Signed-off-by: Arnd Bergmann <a...@arndb.de>
---
 sound/mips/hal2.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/sound/mips/hal2.c b/sound/mips/hal2.c
index ede449f0b50d..0af4f7a9b3e7 100644
--- a/sound/mips/hal2.c
+++ b/sound/mips/hal2.c
@@ -219,6 +219,9 @@ static int hal2_gain_get(struct snd_kcontrol *kcontrol,
                l = (tmp >> H2I_C2_L_GAIN_SHIFT) & 15;
                r = (tmp >> H2I_C2_R_GAIN_SHIFT) & 15;
                break;
+       default:
+               l = 0;
+               r = 0;
        }
        ucontrol->value.integer.value[0] = l;
        ucontrol->value.integer.value[1] = r;
@@ -256,6 +259,9 @@ static int hal2_gain_put(struct snd_kcontrol *kcontrol,
                new |= (r << H2I_C2_R_GAIN_SHIFT);
                hal2_i_write32(hal2, H2I_ADC_C2, new);
                break;
+       default:
+               new = 0;
+               old = 0;
        }
        return old != new;
 }
-- 
2.9.0