linux-kernel - [PATCH AUTOSEL 6.5 04/31] ASoC: simple-card: fixup asoc_simple

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Message-Id: <20231018141151.1334501-4-sashal@kernel.org>
Date:   Wed, 18 Oct 2023 10:11:21 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        kernel test robot <lkp@...el.com>,
        Dan Carpenter <dan.carpenter@...aro.org>,
        Mark Brown <broonie@...nel.org>,
        Sasha Levin <sashal@...nel.org>, lgirdwood@...il.com,
        perex@...ex.cz, tiwai@...e.com, herve.codina@...tlin.com,
        christophe.leroy@...roup.eu, astrid.rost@...s.com,
        aidanmacdonald.0x0@...il.com, alsa-devel@...a-project.org
Subject: [PATCH AUTOSEL 6.5 04/31] ASoC: simple-card: fixup asoc_simple_probe() error handling

From: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>

[ Upstream commit 41bae58df411f9accf01ea660730649b2fab1dab ]

asoc_simple_probe() is used for both "DT probe" (A) and "platform probe"
(B). It uses "goto err" when error case, but it is not needed for
"platform probe" case (B). Thus it is using "return" directly there.

	static int asoc_simple_probe(...)
	{
 ^		if (...) {
 |			...
(A)			if (ret < 0)
 |				goto err;
 v		} else {
 ^			...
 |			if (ret < 0)
(B)				return -Exxx;
 v		}

		...
 ^		if (ret < 0)
(C)			goto err;
 v		...

	err:
(D)		simple_util_clean_reference(card);

		return ret;
	}

Both case are using (C) part, and it calls (D) when err case.
But (D) will do nothing for (B) case.
Because of these behavior, current code itself is not wrong,
but is confusable, and more, static analyzing tool will warning on
(B) part (should use goto err).

To avoid static analyzing tool warning, this patch uses "goto err"
on (B) part.

Reported-by: kernel test robot <lkp@...el.com>
Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
Link: https://lore.kernel.org/r/87o7hy7mlh.wl-kuninori.morimoto.gx@renesas.com
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 sound/soc/generic/simple-card.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/sound/soc/generic/simple-card.c b/sound/soc/generic/simple-card.c
index 0745bf6a09aa0..5005d3c9c659a 100644
--- a/sound/soc/generic/simple-card.c
+++ b/sound/soc/generic/simple-card.c
@@ -701,10 +701,12 @@ static int asoc_simple_probe(struct platform_device *pdev)
 		struct snd_soc_dai_link *dai_link = priv->dai_link;
 		struct simple_dai_props *dai_props = priv->dai_props;
 
+		ret = -EINVAL;
+
 		cinfo = dev->platform_data;
 		if (!cinfo) {
 			dev_err(dev, "no info for asoc-simple-card\n");
-			return -EINVAL;
+			goto err;
 		}
 
 		if (!cinfo->name ||
@@ -713,7 +715,7 @@ static int asoc_simple_probe(struct platform_device *pdev)
 		    !cinfo->platform ||
 		    !cinfo->cpu_dai.name) {
 			dev_err(dev, "insufficient asoc_simple_card_info settings\n");
-			return -EINVAL;
+			goto err;
 		}
 
 		cpus			= dai_link->cpus;
-- 
2.40.1