The patch below does not apply to the 5.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From a1d4ef1adf8bbd302067534ead671a94759687ed Mon Sep 17 00:00:00 2001 From: Fabien Dessenne fabien.dessenne@foss.st.com Date: Mon, 27 Jun 2022 16:23:50 +0200 Subject: [PATCH] pinctrl: stm32: fix optional IRQ support to gpios

To act as an interrupt controller, a gpio bank relies on the "interrupt-parent" of the pin controller. When this optional "interrupt-parent" misses, do not create any IRQ domain.

This fixes a "NULL pointer in stm32_gpio_domain_alloc()" kernel crash when the interrupt-parent = <exti> property is not declared in the Device Tree.

Fixes: 0eb9f683336d ("pinctrl: Add IRQ support to STM32 gpios") Signed-off-by: Fabien Dessenne fabien.dessenne@foss.st.com Link: https://lore.kernel.org/r/20220627142350.742973-1-fabien.dessenne@foss.st.co... Signed-off-by: Linus Walleij linus.walleij@linaro.org

diff --git a/drivers/pinctrl/stm32/pinctrl-stm32.c b/drivers/pinctrl/stm32/pinctrl-stm32.c index 57a33fb0f2d7..14bcca73238a 100644 --- a/drivers/pinctrl/stm32/pinctrl-stm32.c +++ b/drivers/pinctrl/stm32/pinctrl-stm32.c @@ -1338,16 +1338,18 @@ static int stm32_gpiolib_register_bank(struct stm32_pinctrl *pctl, struct fwnode bank->secure_control = pctl->match_data->secure_control; spin_lock_init(&bank->lock);

- /* create irq hierarchical domain */ - bank->fwnode = fwnode; + if (pctl->domain) { + /* create irq hierarchical domain */ + bank->fwnode = fwnode;

- bank->domain = irq_domain_create_hierarchy(pctl->domain, 0, - STM32_GPIO_IRQ_LINE, bank->fwnode, - &stm32_gpio_domain_ops, bank); + bank->domain = irq_domain_create_hierarchy(pctl->domain, 0, STM32_GPIO_IRQ_LINE, + bank->fwnode, &stm32_gpio_domain_ops, + bank);

- if (!bank->domain) { - err = -ENODEV; - goto err_clk; + if (!bank->domain) { + err = -ENODEV; + goto err_clk; + } }

err = gpiochip_add_data(&bank->gpio_chip, bank); @@ -1510,6 +1512,8 @@ int stm32_pctl_probe(struct platform_device *pdev) pctl->domain = stm32_pctrl_get_irq_domain(pdev); if (IS_ERR(pctl->domain)) return PTR_ERR(pctl->domain); + if (!pctl->domain) + dev_warn(dev, "pinctrl without interrupt support\n");

/* hwspinlock is optional */ hwlock_id = of_hwspin_lock_get_id(pdev->dev.of_node, 0);