* [PATCH] gpiolib: irq hooks: fix recursion in gpiochip_irq_unmask
@ 2020-12-10 7:05 Nikita Shubin
2020-12-11 23:26 ` Linus Walleij
0 siblings, 1 reply; 2+ messages in thread
From: Nikita Shubin @ 2020-12-10 7:05 UTC (permalink / raw)
Cc: Nikita Shubin, Linus Walleij, Bartosz Golaszewski, Maulik Shah,
linux-gpio, linux-kernel
irqchip shared with multiple gpiochips, leads to recursive call of
gpiochip_irq_mask/gpiochip_irq_unmask which was assigned to
rqchip->irq_mask/irqchip->irq_unmask, these happens becouse of
only irqchip->irq_enable == gpiochip_irq_enable is checked.
Let's add an additional check to make sure shared irqchip is detected
even if irqchip->irq_enable wasn't defined.
Fixes: a8173820f441 ("gpio: gpiolib: Allow GPIO IRQs to lazy disable")
Signed-off-by: Nikita Shubin <nikita.shubin@maquefel.me>
---
drivers/gpio/gpiolib.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 589eceecf374..5ce0c14c637b 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1419,7 +1419,8 @@ static void gpiochip_set_irq_hooks(struct gpio_chip *gc)
if (WARN_ON(gc->irq.irq_enable))
return;
/* Check if the irqchip already has this hook... */
- if (irqchip->irq_enable == gpiochip_irq_enable) {
+ if (irqchip->irq_enable == gpiochip_irq_enable ||
+ irqchip->irq_mask == gpiochip_irq_mask) {
/*
* ...and if so, give a gentle warning that this is bad
* practice.
--
2.26.2
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] gpiolib: irq hooks: fix recursion in gpiochip_irq_unmask
2020-12-10 7:05 [PATCH] gpiolib: irq hooks: fix recursion in gpiochip_irq_unmask Nikita Shubin
@ 2020-12-11 23:26 ` Linus Walleij
0 siblings, 0 replies; 2+ messages in thread
From: Linus Walleij @ 2020-12-11 23:26 UTC (permalink / raw)
To: Nikita Shubin
Cc: Bartosz Golaszewski, Maulik Shah, open list:GPIO SUBSYSTEM, linux-kernel
On Thu, Dec 10, 2020 at 8:06 AM Nikita Shubin <nikita.shubin@maquefel.me> wrote:
> irqchip shared with multiple gpiochips, leads to recursive call of
> gpiochip_irq_mask/gpiochip_irq_unmask which was assigned to
> rqchip->irq_mask/irqchip->irq_unmask, these happens becouse of
> only irqchip->irq_enable == gpiochip_irq_enable is checked.
>
> Let's add an additional check to make sure shared irqchip is detected
> even if irqchip->irq_enable wasn't defined.
>
> Fixes: a8173820f441 ("gpio: gpiolib: Allow GPIO IRQs to lazy disable")
> Signed-off-by: Nikita Shubin <nikita.shubin@maquefel.me>
Good catch!
Patch applied.
Yours,
Linus Walleij
^ permalink raw reply [flat|nested] 2+ messages in thread
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2020-12-10 7:05 [PATCH] gpiolib: irq hooks: fix recursion in gpiochip_irq_unmask Nikita Shubin
2020-12-11 23:26 ` Linus Walleij
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