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Date:   Fri, 21 Aug 2020 02:04:39 +0300
From:   Vladimir Oltean <>
To:     Jakub Kicinski <>
Cc:     David Thompson <>,,,,
        Asmaa Mnebhi <>
Subject: Re: [PATCH net-next v2] Add Mellanox BlueField Gigabit Ethernet

On Thu, Jul 30, 2020 at 05:30:59PM -0700, Jakub Kicinski wrote:
> On Thu, 30 Jul 2020 18:53:58 -0400 David Thompson wrote:
> > +
> > +	/* Tell networking subsystem to poll GigE driver */
> > +	napi_schedule(&priv->napi);
> _irqoff

Hmm, I wouldn't be so sure about this particular advice. With
PREEMPT_RT, interrupt handlers are force-threaded and run in process
context, therefore with hardirqs enabled. This driver doesn't call
request_irq with IRQF_NO_THREAD, so calling napi_schedule_irqoff would
create a bug that is very, very difficult to find.


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