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gpiolib: irq hooks: fix recursion in gpiochip_irq_unmask

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[ Upstream commit 9d55221995 ]

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: a8173820f4 ("gpio: gpiolib: Allow GPIO IRQs to lazy disable")
Signed-off-by: Nikita Shubin <nikita.shubin@maquefel.me>
Link: https://lore.kernel.org/r/20201210070514.13238-1-nikita.shubin@maquefel.me
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Nikita Shubin
2020-12-10 10:05:14 +03:00
committed by Greg Kroah-Hartman
parent 78d22dd989
commit 2d9284c188
1 changed files with 2 additions and 1 deletions
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3
drivers/gpio/gpiolib.c
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@@ -1477,7 +1477,8 @@ static void gpiochip_set_irq_hooks(struct gpio_chip *gc)
if (WARN_ON(gc->irq.irq_enable)) if (WARN_ON(gc->irq.irq_enable))
return; return;
/* Check if the irqchip already has this hook... */ /* 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 * ...and if so, give a gentle warning that this is bad
* practice. * practice.