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

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Date:   Wed, 26 Jun 2019 15:03:54 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
cc:     x86@...nel.org, Robert Hodaszi <Robert.Hodaszi@...i.com>,
        Vadim Pasternak <vadimp@...lanox.com>,
        Ido Schimmel <idosch@...lanox.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-serial@...r.kernel.org, Marc Zyngier <marc.zyngier@....com>
Subject: Re: [patch 2/5] genirq: Add optional hardware synchronization for
 shutdown

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.