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Date:   Fri, 16 Dec 2022 23:19:27 +0100
From:   Marek Vasut <>
To:     Dmitry Torokhov <>,
        Eric Dumazet <>
Cc:, "David S. Miller" <>,
        Geoff Levand <>,
        Jakub Kicinski <>,
        Linus Walleij <>,
        Paolo Abeni <>,
        Petr Machata <>,
        Wolfram Sang <>
Subject: Re: [PATCH] net: ks8851: Drop IRQ threading

On 12/16/22 22:54, Dmitry Torokhov wrote:
> On Fri, Dec 16, 2022 at 02:23:04PM +0100, Eric Dumazet wrote:
>> On Fri, Dec 16, 2022 at 1:47 PM Marek Vasut <> wrote:
>>> Request non-threaded IRQ in the KSZ8851 driver, this fixes the following warning:
>>> "
>>> NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #08!!!
>> This changelog is a bit terse.
>> Why can other drivers use request_threaded_irq(), but not this one ?
> This one actually *has* to use threading, as (as far as I can see) the
> "lock" that is being taken in ks8851_irq for the SPI variant of the
> device is actually a mutex, so we have to be able to sleep in the
> interrupt handler...

So maybe we should use threaded one for the SPI variant and non-threaded 
one for the Parallel bus variant ?

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