[v1,1/1] pinctrl: stm32: Unshadow np variable in stm32_pctl_probe()

The np variable is used globally for stm32_pctl_probe() and in one of
its code branches. cppcheck is not happy with that:

  pinctrl-stm32.c:1530:23: warning: Local variable 'np' shadows outer variable [shadowVariable]

Instead of simply renaming one of the variables convert some code to
use a device pointer directly.

Fixes: bb949ed9b16b ("pinctrl: stm32: Switch to use for_each_gpiochip_node() helper")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/pinctrl/stm32/pinctrl-stm32.c | 21 +++++++++------------
 1 file changed, 9 insertions(+), 12 deletions(-)

Hi Andy


Thank you for the patch.

Will this patch be applied in Linus pinctrl tree, or in the gpio-intel 
tree before being merged (linux-next) in the pinctrl tree?

BR

Fabien



On 07/05/2022 12:22, Andy Shevchenko wrote:
> The np variable is used globally for stm32_pctl_probe() and in one of
> its code branches. cppcheck is not happy with that:
> 
>    pinctrl-stm32.c:1530:23: warning: Local variable 'np' shadows outer variable [shadowVariable]
> 
> Instead of simply renaming one of the variables convert some code to
> use a device pointer directly.
> 
> Fixes: bb949ed9b16b ("pinctrl: stm32: Switch to use for_each_gpiochip_node() helper")
> Reported-by: kernel test robot <lkp@intel.com>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

Reviewed-by: Fabien Dessenne <fabien.dessenne@foss.st.com>



> ---
>   drivers/pinctrl/stm32/pinctrl-stm32.c | 21 +++++++++------------
>   1 file changed, 9 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/pinctrl/stm32/pinctrl-stm32.c b/drivers/pinctrl/stm32/pinctrl-stm32.c
> index e73f2d24611f..5d1d067b2247 100644
> --- a/drivers/pinctrl/stm32/pinctrl-stm32.c
> +++ b/drivers/pinctrl/stm32/pinctrl-stm32.c
> @@ -1364,8 +1364,9 @@ static int stm32_gpiolib_register_bank(struct stm32_pinctrl *pctl, struct fwnode
>   	return err;
>   }
>   
> -static struct irq_domain *stm32_pctrl_get_irq_domain(struct device_node *np)
> +static struct irq_domain *stm32_pctrl_get_irq_domain(struct platform_device *pdev)
>   {
> +	struct device_node *np = pdev->dev.of_node;
>   	struct device_node *parent;
>   	struct irq_domain *domain;
>   
> @@ -1482,23 +1483,19 @@ static int stm32_pctrl_create_pins_tab(struct stm32_pinctrl *pctl,
>   
>   int stm32_pctl_probe(struct platform_device *pdev)
>   {
> -	struct device_node *np = pdev->dev.of_node;
> +	const struct stm32_pinctrl_match_data *match_data;
>   	struct fwnode_handle *child;
> -	const struct of_device_id *match;
>   	struct device *dev = &pdev->dev;
>   	struct stm32_pinctrl *pctl;
>   	struct pinctrl_pin_desc *pins;
>   	int i, ret, hwlock_id;
>   	unsigned int banks;
>   
> -	if (!np)
> -		return -EINVAL;
> -
> -	match = of_match_device(dev->driver->of_match_table, dev);
> -	if (!match || !match->data)
> +	match_data = device_get_match_data(dev);
> +	if (!match_data)
>   		return -EINVAL;
>   
> -	if (!of_find_property(np, "pins-are-numbered", NULL)) {
> +	if (!device_property_present(dev, "pins-are-numbered")) {
>   		dev_err(dev, "only support pins-are-numbered format\n");
>   		return -EINVAL;
>   	}
> @@ -1510,7 +1507,7 @@ int stm32_pctl_probe(struct platform_device *pdev)
>   	platform_set_drvdata(pdev, pctl);
>   
>   	/* check for IRQ controller (may require deferred probe) */
> -	pctl->domain = stm32_pctrl_get_irq_domain(np);
> +	pctl->domain = stm32_pctrl_get_irq_domain(pdev);
>   	if (IS_ERR(pctl->domain))
>   		return PTR_ERR(pctl->domain);
>   
> @@ -1526,10 +1523,10 @@ int stm32_pctl_probe(struct platform_device *pdev)
>   	spin_lock_init(&pctl->irqmux_lock);
>   
>   	pctl->dev = dev;
> -	pctl->match_data = match->data;
> +	pctl->match_data = match_data;
>   
>   	/*  get optional package information */
> -	if (!of_property_read_u32(np, "st,package", &pctl->pkg))
> +	if (!device_property_read_u32(dev, "st,package", &pctl->pkg))
>   		dev_dbg(pctl->dev, "package detected: %x\n", pctl->pkg);
>   
>   	pctl->pins = devm_kcalloc(pctl->dev, pctl->match_data->npins,

On Mon, May 09, 2022 at 09:39:57AM +0200, Fabien DESSENNE wrote:
> Hi Andy
> 
> 
> Thank you for the patch.
> 
> Will this patch be applied in Linus pinctrl tree, or in the gpio-intel tree
> before being merged (linux-next) in the pinctrl tree?

I believe the pin control tree is a primary here, while applying to GPIO tree
won't harm. But I maintain neither of them :-)

> On 07/05/2022 12:22, Andy Shevchenko wrote:
> > The np variable is used globally for stm32_pctl_probe() and in one of
> > its code branches. cppcheck is not happy with that:
> > 
> >    pinctrl-stm32.c:1530:23: warning: Local variable 'np' shadows outer variable [shadowVariable]
> > 
> > Instead of simply renaming one of the variables convert some code to
> > use a device pointer directly.
> > 
> > Fixes: bb949ed9b16b ("pinctrl: stm32: Switch to use for_each_gpiochip_node() helper")
> > Reported-by: kernel test robot <lkp@intel.com>
> > Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> 
> Reviewed-by: Fabien Dessenne <fabien.dessenne@foss.st.com>

Thanks!

On Sat, May 7, 2022 at 12:23 PM Andy Shevchenko
<andriy.shevchenko@linux.intel.com> wrote:

> The np variable is used globally for stm32_pctl_probe() and in one of
> its code branches. cppcheck is not happy with that:
>
>   pinctrl-stm32.c:1530:23: warning: Local variable 'np' shadows outer variable [shadowVariable]
>
> Instead of simply renaming one of the variables convert some code to
> use a device pointer directly.
>
> Fixes: bb949ed9b16b ("pinctrl: stm32: Switch to use for_each_gpiochip_node() helper")
> Reported-by: kernel test robot <lkp@intel.com>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

Patch applied!

Yours,
Linus Walleij