netdev - Re: [PATCH v5 11/17] net: sgi: ioc3-eth: no need to stop queue set_multicast

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Date:   Wed, 21 Aug 2019 14:40:33 +0200
From:   Thomas Bogendoerfer <tbogendoerfer@...e.de>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc:     Jonathan Corbet <corbet@....net>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Lee Jones <lee.jones@...aro.org>,
        "David S. Miller" <davem@...emloft.net>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        Evgeniy Polyakov <zbr@...emap.net>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org,
        linux-input@...r.kernel.org, netdev@...r.kernel.org,
        linux-rtc@...r.kernel.org, linux-serial@...r.kernel.org
Subject: Re: [PATCH v5 11/17] net: sgi: ioc3-eth: no need to stop queue
 set_multicast_list

On Mon, 19 Aug 2019 17:04:53 -0700
Jakub Kicinski <jakub.kicinski@...ronome.com> wrote:

> On Mon, 19 Aug 2019 18:31:34 +0200, Thomas Bogendoerfer wrote:
> > netif_stop_queue()/netif_wake_qeue() aren't needed for changing
> > multicast filters. Use spinlocks instead for proper protection
> > of private struct.
> > 
>
> I thought it may protect ip->emcr, but that one is accessed with no
> locking from the ioc3_timer() -> ioc3_setup_duplex() path..

it should protect ip->emcr ... I'll add spin_lock/unlock to setup_duplex and
respin the patch.

Thomas.

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