linux-kernel - [PATCH v4.4-rc8] iio: magnetometer: ak8975: Silence 'may be used uninitialized' warning

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Message-Id: <1452298661-3636-1-git-send-email-tim.gardner@canonical.com>
Date:	Fri,  8 Jan 2016 17:17:41 -0700
From:	tim.gardner@...onical.com
To:	linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	Tim Gardner <tim.gardner@...onical.com>,
	Jonathan Cameron <jic23@...nel.org>,
	Hartmut Knaack <knaack.h@....de>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Peter Meerwald <pmeerw@...erw.net>,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Subject: [PATCH v4.4-rc8] iio: magnetometer: ak8975: Silence 'may be used uninitialized' warning

From: Tim Gardner <tim.gardner@...onical.com>

drivers/iio/magnetometer/ak8975.c: In function 'ak8975_probe':
drivers/iio/magnetometer/ak8975.c:788:14: warning: 'chipset' may be used uninitialized in this function [-Wmaybe-uninitialized]
  data->def = &ak_def_array[chipset];

gcc version 5.3.1 20151219 (Ubuntu 5.3.1-4ubuntu1)

Cc: Jonathan Cameron <jic23@...nel.org>
Cc: Hartmut Knaack <knaack.h@....de>
Cc: Lars-Peter Clausen <lars@...afoo.de>
Cc: Peter Meerwald <pmeerw@...erw.net>
Cc: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Signed-off-by: Tim Gardner <tim.gardner@...onical.com>
---

This seems like a legitimate warning, though gcc should have complained
about an earlier use of chipset on line 782.

 drivers/iio/magnetometer/ak8975.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/magnetometer/ak8975.c b/drivers/iio/magnetometer/ak8975.c
index b13936d..80ec0ce 100644
--- a/drivers/iio/magnetometer/ak8975.c
+++ b/drivers/iio/magnetometer/ak8975.c
@@ -732,7 +732,7 @@ static int ak8975_probe(struct i2c_client *client,
 	int eoc_gpio;
 	int err;
 	const char *name = NULL;
-	enum asahi_compass_chipset chipset;
+	enum asahi_compass_chipset chipset = AK_MAX_TYPE;
 
 	/* Grab and set up the supplied GPIO. */
 	if (client->dev.platform_data)
-- 
1.9.1