From: Fabien Dessenne <fabien.dessenne@xxxxxxxxxxx>
commit a1d4ef1adf8bbd302067534ead671a94759687ed upstream.
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@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/20220627142350.742973-1-fabien.dessenne@xxxxxxxxxxx
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/pinctrl/stm32/pinctrl-stm32.c | 20 ++++++++++++--------
1 file changed, 12 insertions(+), 8 deletions(-)
--- a/drivers/pinctrl/stm32/pinctrl-stm32.c
+++ b/drivers/pinctrl/stm32/pinctrl-stm32.c
@@ -1303,15 +1303,17 @@ static int stm32_gpiolib_register_bank(s
bank->bank_ioport_nr = bank_ioport_nr;
spin_lock_init(&bank->lock);
- /* create irq hierarchical domain */
- bank->fwnode = of_node_to_fwnode(np);
+ if (pctl->domain) {
+ /* create irq hierarchical domain */
+ bank->fwnode = of_node_to_fwnode(np);
+
+ 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)
- return -ENODEV;
+ if (!bank->domain)
+ return -ENODEV;
+ }
err = gpiochip_add_data(&bank->gpio_chip, bank);
if (err) {
@@ -1481,6 +1483,8 @@ int stm32_pctl_probe(struct platform_dev
pctl->domain = stm32_pctrl_get_irq_domain(np);
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);
