[PATCH] ASoC: tegra: fix uninitialized variables in set_fmt

[PATCH] ASoC: tegra: fix uninitialized variables in set_fmt

[Stephen Warren]

From: Stephen Warren <swarren-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>

In tegra*_i2s_set_fmt(), in the (fmt == SND_SOC_DAIFMT_CBM_CFM) case,
"val" is never assigned to, but left uninitialized. The other case does
initialized it. Fix this by initializing val at the start of the
function, and only ever ORing into it.

Update the handling of "mask" so it works the same way for consistency.

Update tegra20_spdif.c to use the same code-style for consistency, even
though it doesn't happen to suffer from the same problem at present.

Cc: <stable-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Fixes: 0f163546a772 ("ASoC: tegra: use regmap more directly")
Signed-off-by: Stephen Warren <swarren-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
---
 sound/soc/tegra/tegra20_i2s.c   |  6 +++---
 sound/soc/tegra/tegra20_spdif.c | 10 +++++-----
 sound/soc/tegra/tegra30_i2s.c   |  6 +++---
 3 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/sound/soc/tegra/tegra20_i2s.c b/sound/soc/tegra/tegra20_i2s.c
index 364bf6a907e1..8c819f811470 100644
--- a/sound/soc/tegra/tegra20_i2s.c
+++ b/sound/soc/tegra/tegra20_i2s.c
@@ -74,7 +74,7 @@ static int tegra20_i2s_set_fmt(struct snd_soc_dai *dai,
 				unsigned int fmt)
 {
 	struct tegra20_i2s *i2s = snd_soc_dai_get_drvdata(dai);
-	unsigned int mask, val;
+	unsigned int mask = 0, val = 0;
 
 	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 	case SND_SOC_DAIFMT_NB_NF:
@@ -83,10 +83,10 @@ static int tegra20_i2s_set_fmt(struct snd_soc_dai *dai,
 		return -EINVAL;
 	}
 
-	mask = TEGRA20_I2S_CTRL_MASTER_ENABLE;
+	mask |= TEGRA20_I2S_CTRL_MASTER_ENABLE;
 	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 	case SND_SOC_DAIFMT_CBS_CFS:
-		val = TEGRA20_I2S_CTRL_MASTER_ENABLE;
+		val |= TEGRA20_I2S_CTRL_MASTER_ENABLE;
 		break;
 	case SND_SOC_DAIFMT_CBM_CFM:
 		break;
diff --git a/sound/soc/tegra/tegra20_spdif.c b/sound/soc/tegra/tegra20_spdif.c
index 08bc6931c7c7..8c7c1028e579 100644
--- a/sound/soc/tegra/tegra20_spdif.c
+++ b/sound/soc/tegra/tegra20_spdif.c
@@ -67,15 +67,15 @@ static int tegra20_spdif_hw_params(struct snd_pcm_substream *substream,
 {
 	struct device *dev = dai->dev;
 	struct tegra20_spdif *spdif = snd_soc_dai_get_drvdata(dai);
-	unsigned int mask, val;
+	unsigned int mask = 0, val = 0;
 	int ret, spdifclock;
 
-	mask = TEGRA20_SPDIF_CTRL_PACK |
-	       TEGRA20_SPDIF_CTRL_BIT_MODE_MASK;
+	mask |= TEGRA20_SPDIF_CTRL_PACK |
+		TEGRA20_SPDIF_CTRL_BIT_MODE_MASK;
 	switch (params_format(params)) {
 	case SNDRV_PCM_FORMAT_S16_LE:
-		val = TEGRA20_SPDIF_CTRL_PACK |
-		      TEGRA20_SPDIF_CTRL_BIT_MODE_16BIT;
+		val |= TEGRA20_SPDIF_CTRL_PACK |
+		       TEGRA20_SPDIF_CTRL_BIT_MODE_16BIT;
 		break;
 	default:
 		return -EINVAL;
diff --git a/sound/soc/tegra/tegra30_i2s.c b/sound/soc/tegra/tegra30_i2s.c
index 231a785b3921..02247fee1cf7 100644
--- a/sound/soc/tegra/tegra30_i2s.c
+++ b/sound/soc/tegra/tegra30_i2s.c
@@ -118,7 +118,7 @@ static int tegra30_i2s_set_fmt(struct snd_soc_dai *dai,
 				unsigned int fmt)
 {
 	struct tegra30_i2s *i2s = snd_soc_dai_get_drvdata(dai);
-	unsigned int mask, val;
+	unsigned int mask = 0, val = 0;
 
 	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 	case SND_SOC_DAIFMT_NB_NF:
@@ -127,10 +127,10 @@ static int tegra30_i2s_set_fmt(struct snd_soc_dai *dai,
 		return -EINVAL;
 	}
 
-	mask = TEGRA30_I2S_CTRL_MASTER_ENABLE;
+	mask |= TEGRA30_I2S_CTRL_MASTER_ENABLE;
 	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 	case SND_SOC_DAIFMT_CBS_CFS:
-		val = TEGRA30_I2S_CTRL_MASTER_ENABLE;
+		val |= TEGRA30_I2S_CTRL_MASTER_ENABLE;
 		break;
 	case SND_SOC_DAIFMT_CBM_CFM:
 		break;
-- 
1.8.1.5

Re: [PATCH] ASoC: tegra: fix uninitialized variables in set_fmt

[Thierry Reding]

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On Fri, Dec 06, 2013 at 01:34:50PM -0700, Stephen Warren wrote:
> From: Stephen Warren <swarren@nvidia.com>
> 
> In tegra*_i2s_set_fmt(), in the (fmt == SND_SOC_DAIFMT_CBM_CFM) case,
> "val" is never assigned to, but left uninitialized. The other case does
> initialized it. Fix this by initializing val at the start of the
> function, and only ever ORing into it.
> 
> Update the handling of "mask" so it works the same way for consistency.
> 
> Update tegra20_spdif.c to use the same code-style for consistency, even
> though it doesn't happen to suffer from the same problem at present.
> 
> Cc: <stable@vger.kernel.org>
> Fixes: 0f163546a772 ("ASoC: tegra: use regmap more directly")
> Signed-off-by: Stephen Warren <swarren@nvidia.com>
> ---
>  sound/soc/tegra/tegra20_i2s.c   |  6 +++---
>  sound/soc/tegra/tegra20_spdif.c | 10 +++++-----
>  sound/soc/tegra/tegra30_i2s.c   |  6 +++---
>  3 files changed, 11 insertions(+), 11 deletions(-)

Reviewed-by: Thierry Reding <treding@nvidia.com>

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Re: [PATCH] ASoC: tegra: fix uninitialized variables in set_fmt

[Mark Brown]

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On Fri, Dec 06, 2013 at 01:34:50PM -0700, Stephen Warren wrote:
> From: Stephen Warren <swarren-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
> 
> In tegra*_i2s_set_fmt(), in the (fmt == SND_SOC_DAIFMT_CBM_CFM) case,
> "val" is never assigned to, but left uninitialized. The other case does

Applied, thanks.

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