netdev - Re: [patch 1/1] genirq: Disable interrupts for force threaded handlers

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Message-ID: <20210318085148.3gnvlvzukqsmo2p2@linutronix.de>
Date:   Thu, 18 Mar 2021 09:51:48 +0100
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Johan Hovold <johan@...nel.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        netdev <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-serial@...r.kernel.org
Subject: Re: [patch 1/1] genirq: Disable interrupts for force threaded
 handlers

On 2021-03-17 17:23:39 [+0100], Johan Hovold wrote:
> > > thread(irq_A)
> > >   irq_handler(A)
> > >     spin_lock(&foo->lock);
> > > 
> > > interrupt(irq_B)
> > >   irq_handler(B)
> > >     spin_lock(&foo->lock);
> > 
> > It will not because both threads will wake_up(thread).
> 
> Note that the above says "interrupt(irq_B)" suggesting it's a
> non-threaded interrupt unlike irq_A.

I missed that bit, thanks.

Sebastian