From 92631e33d64426139f6477acb8d3be4417b8d916 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Mon, 29 Jul 2019 09:14:22 +0200 Subject: [PATCH] ALSA: aoa: onyx: always initialize register read value [ Upstream commit f474808acb3c4b30552d9c59b181244e0300d218 ] A lot of places in the driver use onyx_read_register() without checking the return value, and it's been working OK for ~10 years or so, so probably never fails ... Rather than trying to check the return value everywhere, which would be relatively intrusive, at least make sure we don't use an uninitialized value. Fixes: f3d9478b2ce4 ("[ALSA] snd-aoa: add snd-aoa") Reported-by: Stephen Rothwell Signed-off-by: Johannes Berg Signed-off-by: Takashi Iwai Signed-off-by: Sasha Levin --- sound/aoa/codecs/onyx.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/sound/aoa/codecs/onyx.c b/sound/aoa/codecs/onyx.c index d2d96ca..6224fd3 100644 --- a/sound/aoa/codecs/onyx.c +++ b/sound/aoa/codecs/onyx.c @@ -74,8 +74,10 @@ static int onyx_read_register(struct onyx *onyx, u8 reg, u8 *value) return 0; } v = i2c_smbus_read_byte_data(onyx->i2c, reg); - if (v < 0) + if (v < 0) { + *value = 0; return -1; + } *value = (u8)v; onyx->cache[ONYX_REG_CONTROL-FIRSTREGISTER] = *value; return 0; -- 2.7.4