Messages in this thread | | | From | Arnd Bergmann <> | Date | Fri, 12 Feb 2021 21:23:23 +0100 | Subject | Re: [Linuxarm] Re: [PATCH for next v1 1/2] gpio: omap: Replace raw_spin_lock_irqsave with raw_spin_lock in omap_gpio_irq_handler() |
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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
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