Re: [PATCH 2/6] gpio: move hogs into GPIO core

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

Hi Bartosz,

kernel test robot noticed the following build warnings:

[auto build test WARNING on c025f6cf4209e1542ec2afebe49f42bbaf1a5c7b]

url:    https://github.com/intel-lab-lkp/linux/commits/Bartosz-Golaszewski/gpio-of-clear-OF_POPULATED-on-hog-nodes-in-remove-path/20260305-175735
base:   c025f6cf4209e1542ec2afebe49f42bbaf1a5c7b
patch link:    https://lore.kernel.org/r/20260305-gpio-hog-fwnode-v1-2-97d7df6bbd17%40oss.qualcomm.com
patch subject: [PATCH 2/6] gpio: move hogs into GPIO core
config: loongarch-allnoconfig (https://download.01.org/0day-ci/archive/20260306/202603060850.dUlmPBav-lkp@intel.com/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project c32caeec8158d634bb71ab8911a6031248b9fc47)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260306/202603060850.dUlmPBav-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202603060850.dUlmPBav-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/gpio/gpiolib.c:981:10: warning: variable 'ret' is uninitialized when used here [-Wuninitialized]
     981 |                 return ret;
         |                        ^~~
   drivers/gpio/gpiolib.c:971:9: note: initialize the variable 'ret' to silence this warning
     971 |         int ret, argc;
         |                ^
         |                 = 0
   1 warning generated.


vim +/ret +981 drivers/gpio/gpiolib.c

   962	
   963	int gpiochip_add_hog(struct gpio_chip *gc, struct fwnode_handle *fwnode)
   964	{
   965		struct fwnode_handle *gc_node = dev_fwnode(&gc->gpiodev->dev);
   966		struct of_phandle_args gpiospec;
   967		enum gpiod_flags dflags;
   968		struct gpio_desc *desc;
   969		unsigned long lflags;
   970		const char *name;
   971		int ret, argc;
   972		u32 gpios[3]; /* We support up to three-cell bindings. */
   973		u32 cells;
   974	
   975		lflags = GPIO_LOOKUP_FLAGS_DEFAULT;
   976		dflags = GPIOD_ASIS;
   977		name = NULL;
   978	
   979		argc = fwnode_property_count_u32(fwnode, "gpios");
   980		if (argc < 0)
 > 981			return ret;
   982		if (argc > 3)
   983			return -EINVAL;
   984	
   985		ret = fwnode_property_read_u32_array(fwnode, "gpios", gpios, argc);
   986		if (ret < 0)
   987			return ret;
   988	
   989		if (is_of_node(fwnode)) {
   990			/*
   991			 * OF-nodes need some additional special handling for
   992			 * translating of devicetree flags.
   993			 */
   994			ret = fwnode_property_read_u32(gc_node, "#gpio-cells", &cells);
   995			if (ret)
   996				return ret;
   997			if (cells && argc != cells)
   998				return -EINVAL;
   999	
  1000			memset(&gpiospec, 0, sizeof(gpiospec));
  1001			gpiospec.np = to_of_node(fwnode);
  1002			gpiospec.args_count = argc;
  1003			memcpy(&gpiospec.args, gpios, argc * sizeof(u32));
  1004	
  1005			ret = of_gpiochip_get_lflags(gc, &gpiospec, &lflags);
  1006			if (ret)
  1007				return ret;
  1008		} else {
  1009			/*
  1010			 * GPIO_ACTIVE_LOW is currently the only lookup flag
  1011			 * supported for non-OF firmware nodes.
  1012			 */
  1013			if (gpios[1])
  1014				lflags |= GPIO_ACTIVE_LOW;
  1015		}
  1016	
  1017		if (fwnode_property_present(fwnode, "input"))
  1018			dflags |= GPIOD_IN;
  1019		else if (fwnode_property_present(fwnode, "output-low"))
  1020			dflags |= GPIOD_OUT_LOW;
  1021		else if (fwnode_property_present(fwnode, "output-high"))
  1022			dflags |= GPIOD_OUT_HIGH;
  1023		else
  1024			return -EINVAL;
  1025	
  1026		fwnode_property_read_string(fwnode, "line-name", &name);
  1027	
  1028		desc = gpiochip_get_desc(gc, gpios[0]);
  1029		if (IS_ERR(desc))
  1030			return PTR_ERR(desc);
  1031	
  1032		ret = gpiod_hog(desc, name, lflags, dflags);
  1033		if (ret)
  1034			return ret;
  1035	
  1036		return 0;
  1037	}
  1038	

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