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From:   Geert Uytterhoeven <geert@linux-m68k.org>
Date:   Wed, 25 Apr 2018 19:53:06 +0200
Message-ID: <CAMuHMdUVowxjG0Q=DGie_JjPqfz3UBDikvLnZ6_86jbcJMKqyQ@mail.gmail.com>
Subject: Re: [PATCH v2 2/4] ARM: amba: Fix race condition with driver_override
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc:     Geert Uytterhoeven <geert+renesas@glider.be>,
        Russell King <linux@armlinux.org.uk>,
        Adrian Salido <salidoa@google.com>,
        Nicolai Stange <nstange@suse.de>,
        Sasha Levin <Alexander.Levin@microsoft.com>,
        Todd Kjos <tkjos@android.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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Hi Greg,

On Wed, Apr 25, 2018 at 6:06 PM, Greg Kroah-Hartman
<gregkh@linuxfoundation.org> wrote:
> On Tue, Apr 10, 2018 at 03:21:44PM +0200, Geert Uytterhoeven wrote:
>> The driver_override implementation is susceptible to a race condition
>> when different threads are reading vs storing a different driver
>> override.  Add locking to avoid this race condition.
>>
>> Cfr. commits 6265539776a0810b ("driver core: platform: fix race
>> condition with driver_override") and 9561475db680f714 ("PCI: Fix race
>> condition with driver_override").
>>
>> Fixes: 3cf385713460eb2b ("ARM: 8256/1: driver coamba: add device binding path 'driver_override'")
>> Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
>> Reviewed-by: Todd Kjos <tkjos@google.com>
>> Cc: stable <stable@vger.kernel.org>

> As this should go to stable kernels, I've fixed it up to apply without
> patch 1 as that's not a real "fix" that anyone needs...
>
> Please try to remember to put fixes first, and then "trivial" things
> later on in a series.

I did it on purpose, as the fix is much more ugly without patch 1 applied.
Can't you just take patch 1, too? More consistency is always nice, even for
stable ;-)

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds