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ASoC: cs35l41: Fix use of an uninitialised variable 

The loop checking PDN_DONE doesn't check the return value from
regmap_read, nor does it initialise val. This means if regmap_read fails
val will be checked for the PDN_DONE bit whilst being uninitialised.

Fix this up by switching to regmap_read_poll_timeout which tidies up the
code and avoids the uninitialised variable.

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20210914141349.30218-1-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Charles Keepax 2021-09-14 15:13:44 +01:00 committed by Mark Brown
parent 6d66c5ccf5
commit c2f14cc2bc
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GPG Key ID: 24D68B725D5487D0
1 changed files with 5 additions and 14 deletions
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19
sound/soc/codecs/cs35l41.c
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@ -580,7 +580,6 @@ static int cs35l41_main_amp_event(struct snd_soc_dapm_widget *w,
unsigned int val;
int ret = 0;
bool pdn;
int i;
switch (event) {
case SND_SOC_DAPM_POST_PMU:
@ -599,19 +598,11 @@ static int cs35l41_main_amp_event(struct snd_soc_dapm_widget *w,
CS35L41_GLOBAL_EN_MASK, 0);
pdn = false;
for (i = 0; i < 100; i++) {
regmap_read(cs35l41->regmap,
CS35L41_IRQ1_STATUS1,
&val);
if (val & CS35L41_PDN_DONE_MASK) {
pdn = true;
break;
}
usleep_range(1000, 1100);
}
if (!pdn)
dev_warn(cs35l41->dev, "PDN failed\n");
ret = regmap_read_poll_timeout(cs35l41->regmap, CS35L41_IRQ1_STATUS1,
val, val & CS35L41_PDN_DONE_MASK,
1000, 100000);
if (ret)
dev_warn(cs35l41->dev, "PDN failed: %d\n", ret);
regmap_write(cs35l41->regmap, CS35L41_IRQ1_STATUS1,
CS35L41_PDN_DONE_MASK);