linux-kernel - Re: [PATCH 4.9] brcmfmac: use correct skb freeing helper when deleting flowring

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Message-ID: <CACna6rxDb_KMwGTFKu1Mf9azmk_PLO0aLR3foRtkqyywa1DNVQ@mail.gmail.com>
Date:   Tue, 27 Sep 2016 13:58:56 +0200
From:   Rafał Miłecki <zajec5@...il.com>
To:     Kalle Valo <kvalo@...eaurora.org>
Cc:     Arend Van Spriel <arend.vanspriel@...adcom.com>,
        Franky Lin <franky.lin@...adcom.com>,
        Hante Meuleman <hante.meuleman@...adcom.com>,
        Pieter-Paul Giesberts <pieter-paul.giesberts@...adcom.com>,
        Franky Lin <frankyl@...adcom.com>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "open list:BROADCOM BRCM80211 IEEE802.11n WIRELESS DRIVER" 
        <brcm80211-dev-list.pdl@...adcom.com>,
        Network Development <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Rafał Miłecki <rafal@...ecki.pl>
Subject: Re: [PATCH 4.9] brcmfmac: use correct skb freeing helper when
 deleting flowring

On 27 September 2016 at 13:44, Rafał Miłecki <zajec5@...il.com> wrote:
> On 27 September 2016 at 13:27, Kalle Valo <kvalo@...eaurora.org> wrote:
>> Arend Van Spriel <arend.vanspriel@...adcom.com> writes:
>>
>>> On 27-9-2016 11:14, Rafał Miłecki wrote:
>>>> From: Rafał Miłecki <rafal@...ecki.pl>
>>>>
>>>> Flowrings contain skbs waiting for transmission that were passed to us
>>>> by netif. It means we checked every one of them looking for 802.1x
>>>> Ethernet type. When deleting flowring we have to use freeing function
>>>> that will check for 802.1x type as well.
>>>>
>>>> Freeing skbs without a proper check was leading to counter not being
>>>> properly decreased. This was triggering a WARNING every time
>>>> brcmf_netdev_wait_pend8021x was called.
>>>
>>> Acked-by: Arend van Spriel <arend@...adcom.com>
>>>> Signed-off-by: Rafał Miłecki <rafal@...ecki.pl>
>>>> ---
>>>> Kalle: this isn't important enough for 4.8 as it's too late for that.
>>>>
>>>> I'd like to get it for 4.9 however, as this fixes bug that could lead
>>>> to WARNING on every add_key/del_key call. We was struggling with these
>>>> WARNINGs for some time and this fixes one of two problems causing them.
>>
>> Ok, I'll queue this for 4.9.
>>
>>> Please mark it for stable as well.
>>
>> I can add that. Any ideas how old releases stable releases should this
>> go to?
>
> I was analyzing this.
> 1) This patch uses brcmf_get_ifp which is available in 4.4+ only.
> 2) It applies cleanly to 4.5+ only due to 32f90caa7debd ("brcmfmac:
> Increase nr of supported flowrings.")
> 3) 4.4 would also require applying to the patch without broadcom/ subdir
>
> That said I suggest 4.5+. Any objections?

Let me see if patchwork with pick Cc tag as it does for others.

Cc: stable@...r.kernel.org # 4.5+

This may be worth backporting to 4.4 as well (as it's longterm), but
I'll do it separately due to patch not applying cleanly.

-- 
Rafał