Re: [PATCH v2 4/7] nvmem: increase the reference count of a gpio passed over config

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

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Hi Bartosz,

I love your patch! Perhaps something to improve:

[auto build test WARNING on gpio/for-next]
[also build test WARNING on linus/master v5.6-rc2]
[cannot apply to next-20200219]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Bartosz-Golaszewski/nvmem-gpio-fix-resource-management/20200220-045651
base:   https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio.git for-next
config: nios2-3c120_defconfig (attached as .config)
compiler: nios2-linux-gcc (GCC) 7.5.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=7.5.0 make.cross ARCH=nios2 

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

All warnings (new ones prefixed by >>):

   drivers/nvmem/core.c: In function 'nvmem_register':
   drivers/nvmem/core.c:349:20: error: implicit declaration of function 'gpiod_ref'; did you mean 'gpiod_get'? [-Werror=implicit-function-declaration]
      nvmem->wp_gpio = gpiod_ref(config->wp_gpio);
                       ^~~~~~~~~
                       gpiod_get
>> drivers/nvmem/core.c:349:18: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
      nvmem->wp_gpio = gpiod_ref(config->wp_gpio);
                     ^
   cc1: some warnings being treated as errors

vim +349 drivers/nvmem/core.c

   322	
   323	/**
   324	 * nvmem_register() - Register a nvmem device for given nvmem_config.
   325	 * Also creates an binary entry in /sys/bus/nvmem/devices/dev-name/nvmem
   326	 *
   327	 * @config: nvmem device configuration with which nvmem device is created.
   328	 *
   329	 * Return: Will be an ERR_PTR() on error or a valid pointer to nvmem_device
   330	 * on success.
   331	 */
   332	
   333	struct nvmem_device *nvmem_register(const struct nvmem_config *config)
   334	{
   335		struct nvmem_device *nvmem;
   336		int rval;
   337	
   338		if (!config->dev)
   339			return ERR_PTR(-EINVAL);
   340	
   341		nvmem = kzalloc(sizeof(*nvmem), GFP_KERNEL);
   342		if (!nvmem)
   343			return ERR_PTR(-ENOMEM);
   344	
   345		rval  = ida_simple_get(&nvmem_ida, 0, 0, GFP_KERNEL);
   346		if (rval < 0)
   347			goto err_free_nvmem;
   348		if (config->wp_gpio)
 > 349			nvmem->wp_gpio = gpiod_ref(config->wp_gpio);
   350		else
   351			nvmem->wp_gpio = gpiod_get_optional(config->dev, "wp",
   352							    GPIOD_OUT_HIGH);
   353		if (IS_ERR(nvmem->wp_gpio))
   354			goto err_ida_remove;
   355	
   356	
   357		kref_init(&nvmem->refcnt);
   358		INIT_LIST_HEAD(&nvmem->cells);
   359	
   360		nvmem->id = rval;
   361		nvmem->owner = config->owner;
   362		if (!nvmem->owner && config->dev->driver)
   363			nvmem->owner = config->dev->driver->owner;
   364		nvmem->stride = config->stride ?: 1;
   365		nvmem->word_size = config->word_size ?: 1;
   366		nvmem->size = config->size;
   367		nvmem->dev.type = &nvmem_provider_type;
   368		nvmem->dev.bus = &nvmem_bus_type;
   369		nvmem->dev.parent = config->dev;
   370		nvmem->priv = config->priv;
   371		nvmem->type = config->type;
   372		nvmem->reg_read = config->reg_read;
   373		nvmem->reg_write = config->reg_write;
   374		if (!config->no_of_node)
   375			nvmem->dev.of_node = config->dev->of_node;
   376	
   377		if (config->id == -1 && config->name) {
   378			dev_set_name(&nvmem->dev, "%s", config->name);
   379		} else {
   380			dev_set_name(&nvmem->dev, "%s%d",
   381				     config->name ? : "nvmem",
   382				     config->name ? config->id : nvmem->id);
   383		}
   384	
   385		nvmem->read_only = device_property_present(config->dev, "read-only") ||
   386				   config->read_only || !nvmem->reg_write;
   387	
   388		nvmem->dev.groups = nvmem_sysfs_get_groups(nvmem, config);
   389	
   390		device_initialize(&nvmem->dev);
   391	
   392		dev_dbg(&nvmem->dev, "Registering nvmem device %s\n", config->name);
   393	
   394		rval = device_add(&nvmem->dev);
   395		if (rval)
   396			goto err_put_device;
   397	
   398		if (config->compat) {
   399			rval = nvmem_sysfs_setup_compat(nvmem, config);
   400			if (rval)
   401				goto err_device_del;
   402		}
   403	
   404		if (config->cells) {
   405			rval = nvmem_add_cells(nvmem, config->cells, config->ncells);
   406			if (rval)
   407				goto err_teardown_compat;
   408		}
   409	
   410		rval = nvmem_add_cells_from_table(nvmem);
   411		if (rval)
   412			goto err_remove_cells;
   413	
   414		rval = nvmem_add_cells_from_of(nvmem);
   415		if (rval)
   416			goto err_remove_cells;
   417	
   418		blocking_notifier_call_chain(&nvmem_notifier, NVMEM_ADD, nvmem);
   419	
   420		return nvmem;
   421	
   422	err_remove_cells:
   423		nvmem_device_remove_all_cells(nvmem);
   424	err_teardown_compat:
   425		if (config->compat)
   426			nvmem_sysfs_remove_compat(nvmem, config);
   427	err_device_del:
   428		device_del(&nvmem->dev);
   429	err_put_device:
   430		put_device(&nvmem->dev);
   431	err_ida_remove:
   432		ida_simple_remove(&nvmem_ida, nvmem->id);
   433	err_free_nvmem:
   434		kfree(nvmem);
   435	
   436		return ERR_PTR(rval);
   437	}
   438	EXPORT_SYMBOL_GPL(nvmem_register);
   439	

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

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