| Message ID | 20241012105743.12450-2-matsievskiysv@gmail.com |
|---|---|
| State | New |
| Headers | show |
| Series | pinctrl: ocelot: fix system hang on level based interrupts | expand |
On Sat, Oct 12, 2024 at 01:57:43PM +0300, Sergey Matsievskiy wrote: ... > The similar code with chained_irq_enter() / chained_irq_exit() functions > wrapping interrupt checking loop may be found in many other drivers: > ``` > grep -r -A 10 chained_irq_enter drivers/pinctrl > ``` Side note: `git grep ...` is much much faster if you have a Git tree at hand.
diff --git a/drivers/pinctrl/pinctrl-ocelot.c b/drivers/pinctrl/pinctrl-ocelot.c index be9b8c010167..d1ab8450ea93 100644 --- a/drivers/pinctrl/pinctrl-ocelot.c +++ b/drivers/pinctrl/pinctrl-ocelot.c @@ -1955,21 +1955,21 @@ static void ocelot_irq_handler(struct irq_desc *desc) unsigned int reg = 0, irq, i; unsigned long irqs; + chained_irq_enter(parent_chip, desc); + for (i = 0; i < info->stride; i++) { regmap_read(info->map, id_reg + 4 * i, ®); if (!reg) continue; - chained_irq_enter(parent_chip, desc); - irqs = reg; for_each_set_bit(irq, &irqs, min(32U, info->desc->npins - 32 * i)) generic_handle_domain_irq(chip->irq.domain, irq + 32 * i); - - chained_irq_exit(parent_chip, desc); } + + chained_irq_exit(parent_chip, desc); } static int ocelot_gpiochip_register(struct platform_device *pdev,
The current implementation only calls chained_irq_enter() and chained_irq_exit() if it detects pending interrupts. ``` for (i = 0; i < info->stride; i++) { uregmap_read(info->map, id_reg + 4 * i, ®); if (!reg) continue; chained_irq_enter(parent_chip, desc); ``` However, in case of GPIO pin configured in level mode and the parent controller configured in edge mode, GPIO interrupt might be lowered by the hardware. In the result, if the interrupt is short enough, the parent interrupt is still pending while the GPIO interrupt is cleared; chained_irq_enter() never gets called and the system hangs trying to service the parent interrupt. Moving chained_irq_enter() and chained_irq_exit() outside the for loop ensures that they are called even when GPIO interrupt is lowered by the hardware. The similar code with chained_irq_enter() / chained_irq_exit() functions wrapping interrupt checking loop may be found in many other drivers: ``` grep -r -A 10 chained_irq_enter drivers/pinctrl ``` Signed-off-by: Sergey Matsievskiy <matsievskiysv@gmail.com> Reviewed-by: Alexandre Belloni <alexandre.belloni@bootlin.com> --- drivers/pinctrl/pinctrl-ocelot.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)