Date:   Sun, 17 Jan 2021 09:22:01 +0800
From:   kernel test robot <lkp@...el.com>
To:     Jonathan Neuschäfer <j.neuschaefer@....net>,
        linux-kernel@...r.kernel.org
Cc:     kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
        Lee Jones <lee.jones@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Jonathan Neuschäfer <j.neuschaefer@....net>,
        Thierry Reding <thierry.reding@...il.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>
Subject: Re: [PATCH v8 3/7] mfd: Add base driver for Netronix embedded
 controller

Hi "Jonathan,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on lee-mfd/for-mfd-next]
[also build test WARNING on robh/for-next pwm/for-next abelloni/rtc-next linus/master v5.11-rc3 next-20210115]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Jonathan-Neusch-fer/Netronix-embedded-controller-driver-for-Kobo-and-Tolino-ebook-readers/20210117-050203
base:   https://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd.git for-mfd-next
config: mips-randconfig-r001-20210117 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 2082b10d100e8dbaffc2ba8f497db5d2ab61beb2)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install mips cross compiling tool for clang build
        # apt-get install binutils-mips-linux-gnu
        # https://github.com/0day-ci/linux/commit/eee80e6b3b7cc2c733bd3f10d8e2ec23dda2fe26
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Jonathan-Neusch-fer/Netronix-embedded-controller-driver-for-Kobo-and-Tolino-ebook-readers/20210117-050203
        git checkout eee80e6b3b7cc2c733bd3f10d8e2ec23dda2fe26
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

>> drivers/mfd/ntxec.c:127:10: warning: variable 'res' is uninitialized when used here [-Wuninitialized]
                   return res;
                          ^~~
   drivers/mfd/ntxec.c:116:9: note: initialize the variable 'res' to silence this warning
           int res;
                  ^
                   = 0
   1 warning generated.


vim +/res +127 drivers/mfd/ntxec.c

   111	
   112	static int ntxec_probe(struct i2c_client *client)
   113	{
   114		struct ntxec *ec;
   115		unsigned int version;
   116		int res;
   117	
   118		ec = devm_kmalloc(&client->dev, sizeof(*ec), GFP_KERNEL);
   119		if (!ec)
   120			return -ENOMEM;
   121	
   122		ec->dev = &client->dev;
   123	
   124		ec->regmap = devm_regmap_init_i2c(client, &regmap_config);
   125		if (IS_ERR(ec->regmap)) {
   126			dev_err(ec->dev, "Failed to set up regmap for device\n");
 > 127			return res;
   128		}
   129	
   130		/* Determine the firmware version */
   131		res = regmap_read(ec->regmap, NTXEC_REG_VERSION, &version);
   132		if (res < 0) {
   133			dev_err(ec->dev, "Failed to read firmware version number\n");
   134			return res;
   135		}
   136	
   137		/* Bail out if we encounter an unknown firmware version */
   138		switch (version) {
   139		case NTXEC_VERSION_KOBO_AURA:
   140			break;
   141		default:
   142			dev_err(ec->dev,
   143				"Netronix embedded controller version %04x is not supported.\n",
   144				version);
   145			return -ENODEV;
   146		}
   147	
   148		dev_info(ec->dev,
   149			 "Netronix embedded controller version %04x detected.\n", version);
   150	
   151		if (of_device_is_system_power_controller(ec->dev->of_node)) {
   152			/*
   153			 * Set the 'powerkeep' bit. This is necessary on some boards
   154			 * in order to keep the system running.
   155			 */
   156			res = regmap_write(ec->regmap, NTXEC_REG_POWERKEEP,
   157					   NTXEC_POWERKEEP_VALUE);
   158			if (res < 0)
   159				return res;
   160	
   161			if (poweroff_restart_client)
   162				/*
   163				 * Another instance of the driver already took
   164				 * poweroff/restart duties.
   165				 */
   166				dev_err(ec->dev, "poweroff_restart_client already assigned\n");
   167			else
   168				poweroff_restart_client = client;
   169	
   170			if (pm_power_off)
   171				/* Another driver already registered a poweroff handler. */
   172				dev_err(ec->dev, "pm_power_off already assigned\n");
   173			else
   174				pm_power_off = ntxec_poweroff;
   175	
   176			res = register_restart_handler(&ntxec_restart_handler);
   177			if (res)
   178				dev_err(ec->dev,
   179					"Failed to register restart handler: %d\n", res);
   180		}
   181	
   182		i2c_set_clientdata(client, ec);
   183	
   184		res = devm_mfd_add_devices(ec->dev, PLATFORM_DEVID_NONE, ntxec_subdevices,
   185					   ARRAY_SIZE(ntxec_subdevices), NULL, 0, NULL);
   186		if (res)
   187			dev_err(ec->dev, "Failed to add subdevices: %d\n", res);
   188	
   189		return res;
   190	}
   191	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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