* [PATCH v2] ALSA: mips: avoid potential uninitialized variable use
@ 2017-01-16 13:25 Arnd Bergmann
0 siblings, 0 replies; only message in thread
From: Arnd Bergmann @ 2017-01-16 13:25 UTC (permalink / raw)
To: Jaroslav Kysela, Takashi Iwai
Cc: linux-mips, Arnd Bergmann, alsa-devel, linux-kernel
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]
Returning an error for all unexpected cases shuts up the warning
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
v2: return an error instead trying to handle gracefully
---
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
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