linux-kernel - [PATCH 2/2] ASoC: rt5514: Fix uninitialized calibration value

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Message-Id: <1517318383-14420-2-git-send-email-geert@linux-m68k.org>
Date:   Tue, 30 Jan 2018 14:19:43 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Bard Liao <bardliao@...ltek.com>,
        Oder Chiou <oder_chiou@...ltek.com>,
        Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: [PATCH 2/2] ASoC: rt5514: Fix uninitialized calibration value

With gcc-4.1.2, if CONFIG_SND_SOC_RT5514_SPI is not set:

    sound/soc/codecs/rt5514.c: In function ‘rt5514_dsp_voice_wake_up_put’:
    sound/soc/codecs/rt5514.c:363: warning: ‘buf[0]’ is used uninitialized in this function
    sound/soc/codecs/rt5514.c:363: warning: ‘buf[1]’ is used uninitialized in this function
    sound/soc/codecs/rt5514.c:363: warning: ‘buf[2]’ is used uninitialized in this function
    sound/soc/codecs/rt5514.c:363: warning: ‘buf[3]’ is used uninitialized in this function

Fix this by initializing the buffer with zeroes, to avoid random bits
being written to the calibration register later.

Fixes: fc9cab05837639ce ("ASoC: rt5514: The DSP clock can be calibrated by the other clock source")
Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
---
 sound/soc/codecs/rt5514.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sound/soc/codecs/rt5514.c b/sound/soc/codecs/rt5514.c
index 19f01558fbca677f..e5fd0114b1fd4d85 100644
--- a/sound/soc/codecs/rt5514.c
+++ b/sound/soc/codecs/rt5514.c
@@ -358,6 +358,7 @@ static int rt5514_dsp_voice_wake_up_put(struct snd_kcontrol *kcontrol,
 #else
 				dev_err(codec->dev, "There is no SPI driver for"
 					" loading the firmware\n");
+				memset(buf, 0, sizeof(buf));
 #endif
 				rt5514->pll3_cal_value = buf[0] | buf[1] << 8 |
 					buf[2] << 16 | buf[3] << 24;
-- 
2.7.4