CVE-2024-50196: pinctrl: ocelot: fix system hang on level based interrupts

In the Linux kernel, the following vulnerability has been resolved:

pinctrl: ocelot: fix system hang on level based interrupts

The current implementation only calls chainedirqenter() and chainedirqexit() if it detects pending interrupts.

for (i = 0; i < info->stride; i++) { uregmapread(info->map, idreg + 4 i, &reg); if (!reg) continue;

chainedirqenter(parentchip, 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; chainedirqenter() never gets called and the system hangs trying to service the parent interrupt.

Moving chainedirqenter() and chainedirqexit() outside the for loop ensures that they are called even when GPIO interrupt is lowered by the hardware.

The similar code with chainedirqenter() / chainedirqexit() functions wrapping interrupt checking loop may be found in many other drivers: grep -r -A 10 chainedirqenter drivers/pinctrl