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authorNikita Shubin <nikita.shubin@maquefel.me>2020-12-10 10:05:14 +0300
committerLinus Walleij <linus.walleij@linaro.org>2020-12-12 02:25:48 +0300
commit9d5522199505c761575c8ea31dcfd9a2a8d73614 (patch)
tree15d81f62f0b87cb1b73885a8b3ba0f4d4e9b0ccc /drivers/gpio
parente6071cada1694bf13c63e31381993df494d78c42 (diff)
downloadlinux-9d5522199505c761575c8ea31dcfd9a2a8d73614.tar.xz
gpiolib: irq hooks: fix recursion in gpiochip_irq_unmask
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> Link: https://lore.kernel.org/r/20201210070514.13238-1-nikita.shubin@maquefel.me Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio')
-rw-r--r--drivers/gpio/gpiolib.c3
1 files changed, 2 insertions, 1 deletions
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.