[PATCH] ASoC: soc-core: remove always-false path

[PATCH] ASoC: soc-core: remove always-false path

[Pierre-Louis Bossart]

cppcheck throws the following warning:

sound/soc/soc-core.c:2773:6: style: Condition '!num_widgets' is always
false [knownConditionTrueFalse]
 if (!num_widgets) {
     ^

sound/soc/soc-core.c:2761:18: note: Assuming that condition
'num_widgets<0' is not redundant
 if (num_widgets < 0) {
                 ^
sound/soc/soc-core.c:2766:18: note: Assuming condition is false
 if (num_widgets & 1) {
                 ^
sound/soc/soc-core.c:2772:2: note: Compound assignment '/=', assigned
value is 0
 num_widgets /= 2;
 ^

We should check upfront all error conditions.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
---
 sound/soc/soc-core.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index aa687fd126db2..d68e64b73eea7 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -2763,6 +2763,11 @@ int snd_soc_of_parse_audio_simple_widgets(struct snd_soc_card *card,
 			"ASoC: Property '%s' does not exist\n",	propname);
 		return -EINVAL;
 	}
+	if (!num_widgets) {
+		dev_err(card->dev, "ASoC: Property '%s's length is zero\n",
+			propname);
+		return -EINVAL;
+	}
 	if (num_widgets & 1) {
 		dev_err(card->dev,
 			"ASoC: Property '%s' length is not even\n", propname);
@@ -2770,11 +2775,6 @@ int snd_soc_of_parse_audio_simple_widgets(struct snd_soc_card *card,
 	}
 
 	num_widgets /= 2;
-	if (!num_widgets) {
-		dev_err(card->dev, "ASoC: Property '%s's length is zero\n",
-			propname);
-		return -EINVAL;
-	}
 
 	widgets = devm_kcalloc(card->dev, num_widgets, sizeof(*widgets),
 			       GFP_KERNEL);
-- 
2.30.2

Re: [PATCH] ASoC: soc-core: remove always-false path

[Mark Brown]

On Thu, 21 Apr 2022 11:25:05 -0500, Pierre-Louis Bossart wrote:
> cppcheck throws the following warning:
> 
> sound/soc/soc-core.c:2773:6: style: Condition '!num_widgets' is always
> false [knownConditionTrueFalse]
>  if (!num_widgets) {
>      ^
> 
> [...]

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next

Thanks!

[1/1] ASoC: soc-core: remove always-false path
      commit: 8ad0b83e0079564989ccbe5b864cc265a0f5a14d

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark