Re: [PATCH 1/2] watchdog: Add watchdog driver for Sunplus SP7021

[kernel test robot <lkp@intel.com>]

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Hi Xiantao,

I love your patch! Perhaps something to improve:

[auto build test WARNING on pza/reset/next]
[also build test WARNING on robh/for-next linux/master linus/master v5.16-rc1 next-20211118]
[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/Xiantao-Hu/Add-watchdog-driver-for-Sunplus-SP7021-SoC/20211112-191201
base:   https://git.pengutronix.de/git/pza/linux reset/next
config: arm64-randconfig-r023-20211115 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project fbe72e41b99dc7994daac300d208a955be3e4a0a)
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 arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://github.com/0day-ci/linux/commit/eac808eeed4a851ca5cfef12adefd6df199f62c2
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Xiantao-Hu/Add-watchdog-driver-for-Sunplus-SP7021-SoC/20211112-191201
        git checkout eac808eeed4a851ca5cfef12adefd6df199f62c2
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=arm64 

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

All warnings (new ones prefixed by >>):

>> drivers/watchdog/sunplus_wdt.c:191:27: warning: variable 'clk' is uninitialized when used here [-Wuninitialized]
           err = clk_prepare_enable(clk);
                                    ^~~
   drivers/watchdog/sunplus_wdt.c:178:17: note: initialize the variable 'clk' to silence this warning
           struct clk *clk;
                          ^
                           = NULL
   1 warning generated.


vim +/clk +191 drivers/watchdog/sunplus_wdt.c

   172	
   173	static int sp_wdt_probe(struct platform_device *pdev)
   174	{
   175		struct device *dev = &pdev->dev;
   176		struct sp_wdt_priv *priv;
   177		struct resource *wdt_res;
   178		struct clk *clk;
   179		int err;
   180	
   181		priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
   182		if (!priv)
   183			return -ENOMEM;
   184	
   185		priv->clk = devm_clk_get(dev, NULL);
   186		if (IS_ERR(priv->clk)) {
   187			dev_err(dev, "Can't find clock source\n");
   188			return PTR_ERR(priv->clk);
   189		}
   190	
 > 191		err = clk_prepare_enable(clk);
   192		if (err) {
   193			dev_err(dev, "Clock can't be enabled correctly\n");
   194			return err;
   195		}
   196	
   197		priv->rstc = devm_reset_control_get_exclusive(dev, NULL);
   198		if (!IS_ERR(priv->rstc))
   199			reset_control_deassert(priv->rstc);
   200	
   201		platform_set_drvdata(pdev, priv);
   202	
   203		priv->base = devm_platform_ioremap_resource(pdev, 0);
   204		if (IS_ERR(priv->base))
   205			return PTR_ERR(priv->base);
   206	
   207		wdt_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
   208		priv->miscellaneous =
   209		    devm_ioremap(dev, wdt_res->start, resource_size(wdt_res));
   210		if (IS_ERR(priv->miscellaneous))
   211			return PTR_ERR(priv->miscellaneous);
   212	
   213		priv->wdev.info = &sp_wdt_info;
   214		priv->wdev.ops = &sp_wdt_ops;
   215		priv->wdev.timeout = SP_WDT_MAX_TIMEOUT;
   216		priv->wdev.max_timeout = SP_WDT_MAX_TIMEOUT;
   217		priv->wdev.min_timeout = SP_WDT_MIN_TIMEOUT;
   218		priv->wdev.parent = dev;
   219	
   220		watchdog_set_drvdata(&priv->wdev, priv);
   221		sp_wdt_hw_init(&priv->wdev);
   222	
   223		watchdog_init_timeout(&priv->wdev, timeout, dev);
   224		watchdog_set_nowayout(&priv->wdev, nowayout);
   225		watchdog_stop_on_reboot(&priv->wdev);
   226	
   227		err = devm_watchdog_register_device(dev, &priv->wdev);
   228		if (unlikely(err))
   229			return err;
   230	
   231		dev_info(dev, "Watchdog enabled (timeout=%d sec%s.)\n",
   232			 priv->wdev.timeout, nowayout ? ", nowayout" : "");
   233	
   234		return 0;
   235	}
   236	

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

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