[PATCH] pinctrl-st: fix of_irq_to_resource() result check

[Thierry Reding]

On Sat, Jul 29, 2017 at 09:07:07PM +0300, Sergei Shtylyov wrote:
> of_irq_to_resource() has recently been fixed to return negative error #'s
> along with 0 in case of failure, however the ST driver still only regards
> 0 as failure indication -- fix it up.
> 
> Fixes: 7a4228bbff76 ("of: irq: use of_irq_get() in of_irq_to_resource()")
> Signed-off-by: Sergei Shtylyov <sergei.shtylyov at cogentembedded.com>
> 
> ---
>  drivers/pinctrl/pinctrl-st.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> Index: linux-pinctrl/drivers/pinctrl/pinctrl-st.c
> ===================================================================
> --- linux-pinctrl.orig/drivers/pinctrl/pinctrl-st.c
> +++ linux-pinctrl/drivers/pinctrl/pinctrl-st.c
> @@ -1521,7 +1521,7 @@ static int st_gpiolib_register_bank(stru
>  	 *	[irqN]----> [gpio-bank (n)]
>  	 */
>  
> -	if (of_irq_to_resource(np, 0, &irq_res)) {
> +	if (of_irq_to_resource(np, 0, &irq_res) > 0) {
>  		gpio_irq = irq_res.start;
>  		gpiochip_set_chained_irqchip(&bank->gpio_chip, &st_gpio_irqchip,
>  					     gpio_irq, st_gpio_irq_handler);

While at it, maybe turn this into of_irq_get() since you only need the
interrupt number in the first place?

Thierry
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