Re: [PATCH v2] gpio: add support for FTDI's MPSSE as GPIO

[Dan Carpenter <dan.carpenter@xxxxxxxxxx>]

Hi Mary,

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/Mary-Strodl/gpio-add-support-for-FTDI-s-MPSSE-as-GPIO/20240919-221626
base:   https://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux.git gpio/for-next
patch link:    https://lore.kernel.org/r/20240919141014.4000958-1-mstrodl%40csh.rit.edu
patch subject: [PATCH v2] gpio: add support for FTDI's MPSSE as GPIO
config: x86_64-randconfig-161-20240922 (https://download.01.org/0day-ci/archive/20240923/202409230158.XhvhLOyY-lkp@xxxxxxxxx/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0

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/202409230158.XhvhLOyY-lkp@xxxxxxxxx/

smatch warnings:
drivers/gpio/gpio-mpsse.c:211 gpio_mpsse_get_multiple() warn: inconsistent returns '&priv->io_mutex'.

vim +211 drivers/gpio/gpio-mpsse.c

be777399e9baea Mary Strodl 2024-09-19  190  static int gpio_mpsse_get_multiple(struct gpio_chip *chip, unsigned long *mask,
be777399e9baea Mary Strodl 2024-09-19  191  				   unsigned long *bits)
be777399e9baea Mary Strodl 2024-09-19  192  {
be777399e9baea Mary Strodl 2024-09-19  193  	unsigned long i, bank, bank_mask;
be777399e9baea Mary Strodl 2024-09-19  194  	int ret;
be777399e9baea Mary Strodl 2024-09-19  195  	struct mpsse_priv *priv = gpiochip_get_data(chip);
be777399e9baea Mary Strodl 2024-09-19  196  
be777399e9baea Mary Strodl 2024-09-19  197  	mutex_lock(&priv->io_mutex);
be777399e9baea Mary Strodl 2024-09-19  198  	for_each_set_clump8(i, bank_mask, mask, chip->ngpio) {
be777399e9baea Mary Strodl 2024-09-19  199  		bank = i / 8;
be777399e9baea Mary Strodl 2024-09-19  200  
be777399e9baea Mary Strodl 2024-09-19  201  		if (bank_mask) {
be777399e9baea Mary Strodl 2024-09-19  202  			ret = gpio_mpsse_get_bank(priv, bank);
be777399e9baea Mary Strodl 2024-09-19  203  			if (ret < 0)
be777399e9baea Mary Strodl 2024-09-19  204  				return ret;

Needs to mutex_unlock(&priv->io_mutex) before returning.

be777399e9baea Mary Strodl 2024-09-19  205  
be777399e9baea Mary Strodl 2024-09-19  206  			bitmap_set_value8(bits, ret & bank_mask, i);
be777399e9baea Mary Strodl 2024-09-19  207  		}
be777399e9baea Mary Strodl 2024-09-19  208  	}
be777399e9baea Mary Strodl 2024-09-19  209  	mutex_unlock(&priv->io_mutex);
be777399e9baea Mary Strodl 2024-09-19  210  
be777399e9baea Mary Strodl 2024-09-19 @211  	return 0;
be777399e9baea Mary Strodl 2024-09-19  212  }

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