linux-kernel - [PATCH] ASoC: cs35l32: avoid uninitialized variable access

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Date:	Sat, 02 Jan 2016 00:19:52 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	broonie@...nel.org
Cc:	Brian Austin <brian.austin@...rus.com>,
	Paul Handrigan <Paul.Handrigan@...rus.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: [PATCH] ASoC: cs35l32: avoid uninitialized variable access

gcc warns about the possibilty of accessing a property read from
devicetree in cs35l32_i2c_probe() when it has not been initialized
because CONFIG_OF is disabled:

sound/soc/codecs/cs35l32.c: In function 'cs35l32_i2c_probe':
sound/soc/codecs/cs35l32.c:278:2: warning: 'val' may be used uninitialized in this function [-Wmaybe-uninitialized]

The code is actually correct because it checks the dev->of_node
variable first and we know this is NULL here, but by adding a
check for IS_ENABLED(CONFIG_OF), we can let the compiler know
as well, and also generate smaller object code.

Signed-off-by: Arnd Bergmann <arnd@...db.de>

diff --git a/sound/soc/codecs/cs35l32.c b/sound/soc/codecs/cs35l32.c
index 44c30fe3e315..52ffaa8eb02b 100644
--- a/sound/soc/codecs/cs35l32.c
+++ b/sound/soc/codecs/cs35l32.c
@@ -372,7 +372,7 @@ static int cs35l32_i2c_probe(struct i2c_client *i2c_client,
 			dev_err(&i2c_client->dev, "could not allocate pdata\n");
 			return -ENOMEM;
 		}
-		if (i2c_client->dev.of_node) {
+		if (IS_ENABLED(CONFIG_OF) && i2c_client->dev.of_node) {
 			ret = cs35l32_handle_of_data(i2c_client,
 						     &cs35l32->pdata);
 			if (ret != 0)

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