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Subject[PATCH 1/2] ASoC: codec: wm9860: avoid maybe-uninitialized warning
Date
The new PLL configuration code triggers a harmless warning:

sound/soc/codecs/wm8960.c: In function 'wm8960_configure_clocking':
sound/soc/codecs/wm8960.c:735:3: error: 'best_freq_out' may be used
uninitialized in this function [-Werror=maybe-uninitialized]
wm8960_set_pll(codec, freq_in, best_freq_out);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
sound/soc/codecs/wm8960.c:699:12: note: 'best_freq_out' was declared
here

Fixes: 84fdc00d519f ("ASoC: codec: wm9860: Refactor PLL out freq search")
Fixes: 303e8954af8d ("ASoC: codec: wm8960: Stop when a matching PLL freq is found")
Suggested-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>
---
Arnd,

I agree that your code was more both humans and gcc anyhow
for consistency with wm8960_configure_sysclk function I preferred
to keep the "if(..) break" statements.

sound/soc/codecs/wm8960.c | 14 ++++++--------
1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/sound/soc/codecs/wm8960.c b/sound/soc/codecs/wm8960.c
index ace69da..8c87153 100644
--- a/sound/soc/codecs/wm8960.c
+++ b/sound/soc/codecs/wm8960.c
@@ -702,7 +702,7 @@ int wm8960_configure_pll(struct snd_soc_codec *codec, int freq_in,
bclk = wm8960->bclk;
lrclk = wm8960->lrclk;

- *bclk_idx = -1;
+ best_freq_out = -EINVAL;

for (i = 0; i < ARRAY_SIZE(sysclk_divs); ++i) {
if (sysclk_divs[i] == -1)
@@ -731,10 +731,7 @@ int wm8960_configure_pll(struct snd_soc_codec *codec, int freq_in,
break;
}

- if (*bclk_idx != -1)
- wm8960_set_pll(codec, freq_in, best_freq_out);
-
- return *bclk_idx;
+ return best_freq_out;
}
static int wm8960_configure_clocking(struct snd_soc_codec *codec)
{
@@ -783,11 +780,12 @@ static int wm8960_configure_clocking(struct snd_soc_codec *codec)
}
}

- ret = wm8960_configure_pll(codec, freq_in, &i, &j, &k);
- if (ret < 0) {
+ freq_out = wm8960_configure_pll(codec, freq_in, &i, &j, &k);
+ if (freq_out < 0) {
dev_err(codec->dev, "failed to configure clock via PLL\n");
- return -EINVAL;
+ return freq_out;
}
+ wm8960_set_pll(codec, freq_in, freq_out);

configure_clock:
/* configure sysclk clock */
--
2.7.4
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