Re: [PATCH v1 2/2] hwmon: Driver for Nuvoton NCT736X

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Hi,

kernel test robot noticed the following build warnings:

https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/baneric926-gmail-com/dt-bindings-hwmon-Add-nct736x-bindings/20231204-135942
base:   linus/master
patch link:    https://lore.kernel.org/r/20231204055650.788388-3-kcfeng0%40nuvoton.com
patch subject: [PATCH v1 2/2] hwmon: Driver for Nuvoton NCT736X
config: m68k-randconfig-r071-20231207 (https://download.01.org/0day-ci/archive/20231207/202312071152.Kfcw1KlD-lkp@xxxxxxxxx/config)
compiler: m68k-linux-gcc (GCC) 13.2.0
reproduce: (https://download.01.org/0day-ci/archive/20231207/202312071152.Kfcw1KlD-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
| Closes: https://lore.kernel.org/r/202312071152.Kfcw1KlD-lkp@xxxxxxxxx/

smatch warnings:
drivers/hwmon/nct736x.c:367 nct736x_init_chip() error: uninitialized symbol 'gpio0_3'.
drivers/hwmon/nct736x.c:370 nct736x_init_chip() error: uninitialized symbol 'gpio4_7'.
drivers/hwmon/nct736x.c:373 nct736x_init_chip() error: uninitialized symbol 'gpio10_13'.
drivers/hwmon/nct736x.c:376 nct736x_init_chip() error: uninitialized symbol 'gpio14_17'.

vim +/gpio0_3 +367 drivers/hwmon/nct736x.c

16e62bcf3c9b93 Ban Feng 2023-12-04  335  static int nct736x_init_chip(struct i2c_client *client,
16e62bcf3c9b93 Ban Feng 2023-12-04  336  			     u32 pwm_mask, u32 fanin_mask, u32 wdt_cfg)
16e62bcf3c9b93 Ban Feng 2023-12-04  337  {
16e62bcf3c9b93 Ban Feng 2023-12-04  338  	const struct i2c_device_id *id = i2c_match_id(nct736x_id, client);
16e62bcf3c9b93 Ban Feng 2023-12-04  339  	u8 i, gpio0_3, gpio4_7, gpio10_13, gpio14_17;
16e62bcf3c9b93 Ban Feng 2023-12-04  340  	int ret;
16e62bcf3c9b93 Ban Feng 2023-12-04  341  
16e62bcf3c9b93 Ban Feng 2023-12-04  342  	for (i = 0; i < NCT736X_PWM_COUNT; i++) {
16e62bcf3c9b93 Ban Feng 2023-12-04  343  		if (i < 4) {
16e62bcf3c9b93 Ban Feng 2023-12-04  344  			if (pwm_mask & BIT_CHECK(i))
16e62bcf3c9b93 Ban Feng 2023-12-04  345  				gpio0_3 |= PWM_SEL(i);

This doesn't work.  gpio0_3 needs to be initialized to zero before we
can turn on individual bits.

16e62bcf3c9b93 Ban Feng 2023-12-04  346  			if (fanin_mask & BIT_CHECK(i))
16e62bcf3c9b93 Ban Feng 2023-12-04  347  				gpio10_13 |= FANIN_SEL(i);

Etc...

16e62bcf3c9b93 Ban Feng 2023-12-04  348  		} else if (i < 8) {
16e62bcf3c9b93 Ban Feng 2023-12-04  349  			if (pwm_mask & BIT_CHECK(i))
16e62bcf3c9b93 Ban Feng 2023-12-04  350  				gpio4_7 |= PWM_SEL(i);
16e62bcf3c9b93 Ban Feng 2023-12-04  351  			if (fanin_mask & BIT_CHECK(i))
16e62bcf3c9b93 Ban Feng 2023-12-04  352  				gpio14_17 |= FANIN_SEL(i);
16e62bcf3c9b93 Ban Feng 2023-12-04  353  		} else if (i < 12) {
16e62bcf3c9b93 Ban Feng 2023-12-04  354  			if (pwm_mask & BIT_CHECK(i))
16e62bcf3c9b93 Ban Feng 2023-12-04  355  				gpio10_13 |= PWM_SEL(i);
16e62bcf3c9b93 Ban Feng 2023-12-04  356  			if (fanin_mask & BIT_CHECK(i))
16e62bcf3c9b93 Ban Feng 2023-12-04  357  				gpio0_3 |= FANIN_SEL(i);
16e62bcf3c9b93 Ban Feng 2023-12-04  358  		} else {
16e62bcf3c9b93 Ban Feng 2023-12-04  359  			if (pwm_mask & BIT_CHECK(i))
16e62bcf3c9b93 Ban Feng 2023-12-04  360  				gpio14_17 |= PWM_SEL(i);
16e62bcf3c9b93 Ban Feng 2023-12-04  361  			if (fanin_mask & BIT_CHECK(i))
16e62bcf3c9b93 Ban Feng 2023-12-04  362  				gpio4_7 |= FANIN_SEL(i);
16e62bcf3c9b93 Ban Feng 2023-12-04  363  		}
16e62bcf3c9b93 Ban Feng 2023-12-04  364  	}
16e62bcf3c9b93 Ban Feng 2023-12-04  365  
16e62bcf3c9b93 Ban Feng 2023-12-04  366  	/* Pin Function Configuration */
16e62bcf3c9b93 Ban Feng 2023-12-04 @367  	ret = nct736x_write_reg(client, NCT736X_REG_GPIO_0_3, gpio0_3);
                                                                                                      ^^^^^^^

16e62bcf3c9b93 Ban Feng 2023-12-04  368  	if (ret < 0)
16e62bcf3c9b93 Ban Feng 2023-12-04  369  		return ret;
16e62bcf3c9b93 Ban Feng 2023-12-04 @370  	ret = nct736x_write_reg(client, NCT736X_REG_GPIO_4_7, gpio4_7);
16e62bcf3c9b93 Ban Feng 2023-12-04  371  	if (ret < 0)
16e62bcf3c9b93 Ban Feng 2023-12-04  372  		return ret;
16e62bcf3c9b93 Ban Feng 2023-12-04 @373  	ret = nct736x_write_reg(client, NCT736X_REG_GPIO_10_13, gpio10_13);
16e62bcf3c9b93 Ban Feng 2023-12-04  374  	if (ret < 0)
16e62bcf3c9b93 Ban Feng 2023-12-04  375  		return ret;
16e62bcf3c9b93 Ban Feng 2023-12-04 @376  	ret = nct736x_write_reg(client, NCT736X_REG_GPIO_14_17, gpio14_17);
16e62bcf3c9b93 Ban Feng 2023-12-04  377  	if (ret < 0)
16e62bcf3c9b93 Ban Feng 2023-12-04  378  		return ret;
16e62bcf3c9b93 Ban Feng 2023-12-04  379  
16e62bcf3c9b93 Ban Feng 2023-12-04  380  	/* PWM and FANIN Monitoring Enable */

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki





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