linux-kernel - [PATCH] ASoC: stm32: sai: attempt to fix uninitialized variable

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Date:   Thu,  2 Nov 2017 12:15:48 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Mark Brown <broonie@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>, Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Olivier Moysan <olivier.moysan@...com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        alsa-devel@...a-project.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] ASoC: stm32: sai: attempt to fix uninitialized variable

After commit 61fb4ff70377 ("ASoC: stm32: sai: Move static
settings to DAI init"), we get a valid warning about the
use of an uninitialized variable:

sound/soc/stm/stm32_sai_sub.c: In function 'stm32_sai_hw_params':
sound/soc/stm/stm32_sai_sub.c:485:7: error: 'cr1' may be used uninitialized in this function [-Werror=maybe-uninitialized]

I could not immediately figure out what the code should do
instead, this is the hack I applied locally to shut up the
warning. It may or may not be correct, please take a look.

Fixes: 61fb4ff70377 ("ASoC: stm32: sai: Move static settings to DAI init")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 sound/soc/stm/stm32_sai_sub.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sound/soc/stm/stm32_sai_sub.c b/sound/soc/stm/stm32_sai_sub.c
index 150ad546d8b9..d8a51fce368a 100644
--- a/sound/soc/stm/stm32_sai_sub.c
+++ b/sound/soc/stm/stm32_sai_sub.c
@@ -480,6 +480,7 @@ static int stm32_sai_set_config(struct snd_soc_dai *cpu_dai,
 
 	/* Mode, data format and channel config */
 	cr1_mask = SAI_XCR1_DS_MASK;
+	cr1 = 0;
 	switch (params_format(params)) {
 	case SNDRV_PCM_FORMAT_S8:
 		cr1 |= SAI_XCR1_DS_SET(SAI_DATASIZE_8);
-- 
2.9.0