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From:   "Sa, Nuno" <Nuno.Sa@analog.com>
To:     Dan Carpenter <dan.carpenter@oracle.com>,
        "kbuild@lists.01.org" <kbuild@lists.01.org>,
        "Hennerich, Michael" <Michael.Hennerich@analog.com>
CC:     "lkp@intel.com" <lkp@intel.com>,
        "kbuild-all@lists.01.org" <kbuild-all@lists.01.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Jonathan Cameron <Jonathan.Cameron@huawei.com>
Subject: RE: [jic23-iio:testing 149/150] drivers/iio/dac/ad5593r.c:87
 ad5593r_gpio_read() error: uninitialized symbol 'val'.
Thread-Topic: [jic23-iio:testing 149/150] drivers/iio/dac/ad5593r.c:87
 ad5593r_gpio_read() error: uninitialized symbol 'val'.
Thread-Index: AQHYyZllGwG13peD5U2AjjCO3xWkAq3hoyOg
Date:   Fri, 16 Sep 2022 07:11:54 +0000
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References: <202209160614.IE7ciPMN-lkp@intel.com>
In-Reply-To: <202209160614.IE7ciPMN-lkp@intel.com>
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Hi Dan,

> From: Dan Carpenter <dan.carpenter@oracle.com>
> Sent: Friday, September 16, 2022 8:56 AM
> To: kbuild@lists.01.org; Hennerich, Michael
> <Michael.Hennerich@analog.com>
> Cc: lkp@intel.com; kbuild-all@lists.01.org; linux-kernel@vger.kernel.org;
> Jonathan Cameron <Jonathan.Cameron@huawei.com>; Sa, Nuno
> <Nuno.Sa@analog.com>
> Subject: [jic23-iio:testing 149/150] drivers/iio/dac/ad5593r.c:87
> ad5593r_gpio_read() error: uninitialized symbol 'val'.
>=20
> [External]
>=20
> tree:
> https://urldefense.com/v3/__https://git.kernel.org/pub/scm/linux/kernel/g
> it/jic23/iio.git__;!!A3Ni8CS0y2Y!94Jf_eIoy5zwbmsSRdWgugxbqkbgHFd0A88T
> z4SKRufGLX24YYSEzKlB13AXeYzsBWzd5HW-SqPpIzc8hvh-6w$   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
>=20
> If you fix the issue, kindly add following tag where applicable
> Reported-by: kernel test robot <lkp@intel.com>
> Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
>=20
> smatch warnings:
> drivers/iio/dac/ad5593r.c:87 ad5593r_gpio_read() error: uninitialized sym=
bol
> 'val'.
>=20
> vim +/val +87 drivers/iio/dac/ad5593r.c
>=20
> 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=
 =3D
> 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 =3D
> ad5593r_read_word(i2c, AD5593R_MODE_GPIO_READBACK, &val);
> 56ca9db862bf3d7 Paul Cercueil     2016-04-05  86
> 56ca9db862bf3d7 Paul Cercueil     2016-04-05 @87  	*value =3D (u8) val;
>=20
>=20
> 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.

Hmm, in theory, it can if one of the i2c functions (for some reason) return=
 error.
Not sure how to handle this... Given this is still in the testing branch sh=
ould I
just re-spin another version of the series? Jonathan?

- Nuno S=E1