linux-kernel - [jic23-iio:testing 149/150] drivers/iio/dac/ad5593r.c:87 ad5593r_gpio_read() error: uninitialized symbol 'val'.

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Message-ID: <202209160614.IE7ciPMN-lkp@intel.com>
Date:   Fri, 16 Sep 2022 09:55:34 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     kbuild@...ts.01.org,
        Michael Hennerich <michael.hennerich@...log.com>
Cc:     lkp@...el.com, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Nuno Sá <nuno.sa@...log.com>
Subject: [jic23-iio:testing 149/150] drivers/iio/dac/ad5593r.c:87
 ad5593r_gpio_read() error: uninitialized symbol 'val'.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git testing
head:   62a6e699f4669b2c51f408273756f93b21c9f1a1
commit: 53b6e3b2164c5807669fbf6b3df0e1494b4d03b8 [149/150] iio: dac: ad5593r: Fix i2c read protocol requirements
config: x86_64-randconfig-m001
compiler: gcc-11 (Debian 11.3.0-5) 11.3.0

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>

smatch warnings:
drivers/iio/dac/ad5593r.c:87 ad5593r_gpio_read() error: uninitialized symbol 'val'.

vim +/val +87 drivers/iio/dac/ad5593r.c

56ca9db862bf3d7 Paul Cercueil     2016-04-05  79  static int ad5593r_gpio_read(struct ad5592r_state *st, u8 *value)
56ca9db862bf3d7 Paul Cercueil     2016-04-05  80  {
56ca9db862bf3d7 Paul Cercueil     2016-04-05  81  	struct i2c_client *i2c = to_i2c_client(st->dev);
53b6e3b2164c580 Michael Hennerich 2022-09-13  82  	u16 val;
53b6e3b2164c580 Michael Hennerich 2022-09-13  83  	int ret;
56ca9db862bf3d7 Paul Cercueil     2016-04-05  84  
53b6e3b2164c580 Michael Hennerich 2022-09-13  85  	ret = ad5593r_read_word(i2c, AD5593R_MODE_GPIO_READBACK, &val);
56ca9db862bf3d7 Paul Cercueil     2016-04-05  86  
56ca9db862bf3d7 Paul Cercueil     2016-04-05 @87  	*value = (u8) val;


In the original code the error checking prevented reading uninitialized
variables.  It's not really a problem, because ad5593r_read_word() can't
actually fail but, you know?  Technically the checker is correct.

56ca9db862bf3d7 Paul Cercueil     2016-04-05  88  
53b6e3b2164c580 Michael Hennerich 2022-09-13  89  	return ret;
56ca9db862bf3d7 Paul Cercueil     2016-04-05  90  }