[Linuxarm] Re: [PATCH for next v1 1/2] gpio: omap: Replace raw_spin_lock_irqsave with raw_spin_lock in omap_gpio_irq_handler()

On Fri, Feb 12, 2021 at 12:53 PM Grygorii Strashko <grygorii.strashko@ti.com> wrote:

The worst RT case I can imagine is when gpio API is still called from hard IRQ context by some other device driver - some toggling for example. Note. RT or "threadirqs" does not mean gpiochip become sleepable.

In this case: threaded handler raw_spin_lock IRQ from other device hard_irq handler gpiod_x() raw_spin_lock_irqsave() -- oops

Good point, I had missed the fact that drivers can call gpio functions from hardirq context when I replied earlier, gpio is clearly special here. Arnd