linux-kernel - [PATCH v6 05/13] iio: inkern: Remove the 'unused' variable usage in iio_channel_read

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Message-Id: <20230623085830.749991-6-herve.codina@bootlin.com>
Date:   Fri, 23 Jun 2023 10:58:22 +0200
From:   Herve Codina <herve.codina@...tlin.com>
To:     Herve Codina <herve.codina@...tlin.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
        Wojciech Ziemba <wojciech.ziemba@...el.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: [PATCH v6 05/13] iio: inkern: Remove the 'unused' variable usage in iio_channel_read_max()

The code uses a local variable to initialize a null pointer in order to
avoid accessing this null pointer later on.

Simply removed the 'unused' variable and check for the null pointer just
before accessing it.

Signed-off-by: Herve Codina <herve.codina@...tlin.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
Acked-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
---
 drivers/iio/inkern.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c
index f738db9a0c04..ce537b4ca6ca 100644
--- a/drivers/iio/inkern.c
+++ b/drivers/iio/inkern.c
@@ -849,14 +849,10 @@ static int iio_channel_read_max(struct iio_channel *chan,
 				int *val, int *val2, int *type,
 				enum iio_chan_info_enum info)
 {
-	int unused;
 	const int *vals;
 	int length;
 	int ret;
 
-	if (!val2)
-		val2 = &unused;
-
 	ret = iio_channel_read_avail(chan, &vals, type, &length, info);
 	if (ret < 0)
 		return ret;
@@ -869,7 +865,8 @@ static int iio_channel_read_max(struct iio_channel *chan,
 			break;
 		default:
 			*val = vals[4];
-			*val2 = vals[5];
+			if (val2)
+				*val2 = vals[5];
 		}
 		return 0;
 
-- 
2.40.1