Re: [patch 2/5] genirq: Add optional hardware synchronization for shutdown

[Thomas Gleixner]

On Tue, 25 Jun 2019, Thomas Gleixner wrote:
>   *	Returns: false if a threaded handler is active.
>   *
>   *	This function may be called - with care - from IRQ context.
> + *
> + *	It does not check whether there is an interrupt on flight at the
> + *	hardware level, but not serviced yet, as this might deadlock.

  + when invoked from an interrupt disabled region.