linux-kernel - Re: [patch 11/35] net: ionic: Replace in

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Message-ID: <87h7rgk5tb.fsf@nanos.tec.linutronix.de>
Date:   Tue, 29 Sep 2020 16:37:04 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Shannon Nelson <snelson@...sando.io>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Linus Torvalds <torvalds@...uxfoundation.org>,
        Paul McKenney <paulmck@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Pensando Drivers <drivers@...sando.io>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        Christian Benvenuti <benve@...co.com>,
        Govindarajulu Varadarajan <_govind@....com>,
        Jonathan Corbet <corbet@....net>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        linux-doc@...r.kernel.org,
        Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
        Jay Cliburn <jcliburn@...il.com>,
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        Russell King <linux@...linux.org.uk>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
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        Pascal Terjan <pterjan@...gle.com>,
        Ping-Ke Shih <pkshih@...ltek.com>
Subject: Re: [patch 11/35] net: ionic: Replace in_interrupt() usage.

On Mon, Sep 28 2020 at 12:51, Shannon Nelson wrote:
> On 9/28/20 10:24 AM, Shannon Nelson wrote:
>>> ionic_lif_addr() can be called from:
>>>
>>>   1) ->ndo_set_rx_mode() which is under netif_addr_lock_bh()) so it 
>>> must not
>>>      sleep.
>>>
>>>   2) Init and setup functions which are in fully preemptible task 
>>> context.
>>>
>>> _ionic_lif_rx_mode() has only one call path with BH disabled.
>
> Now that I've had my coffee, let's look at this again - there are 
> multiple paths that get us to _ionic_lif_rx_mode():
>
> .ndo_set_rx_mode
>    ionic_set_rx_mode,
>      _ionic_lif_rx_mode
>
> { ionic_open, ionic_lif_handle_fw_up, ionic_start_queues_reconfig }
>      ionic_txrx_init
>        ionic_set_rx_mode
>          _ionic_lif_rx_mode

Hrm. Let me stare at it again...