[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 11/02/2021 21:39, Arnd Bergmann wrote:

On Thu, Feb 11, 2021 at 7:25 PM Grygorii Strashko grygorii.strashko@ti.com wrote:

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On 08/02/2021 10:56, Luo Jiaxing wrote:

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There is no need to use API with _irqsave in omap_gpio_irq_handler(), because it already be in a irq-disabled context.

NACK. Who said that this is always hard IRQ handler? What about RT-kernel or boot with "threadirqs"?

In those cases, the interrupt handler is just a normal thread, so the preempt_disable() that is implied by raw_spin_lock() is sufficient.

Disabling interrupts inside of an interrupt handler is always incorrect, the patch looks like a useful cleanup to me, if only for readability.

Note. there is also generic_handle_irq() call inside.