linux-kernel - Re: [PATCH] mac80211: fix possible deadlock in TX path

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Message-ID: <656f3938-ef82-c1ce-753c-cb6b9d3c424b@gmail.com>
Date:   Wed, 1 May 2019 13:06:47 +0200
From:   Erik Stromdahl <erik.stromdahl@...il.com>
To:     Toke Høiland-Jørgensen <toke@...hat.com>,
        johannes@...solutions.net, davem@...emloft.net,
        linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mac80211: fix possible deadlock in TX path



On 4/30/19 9:49 AM, Toke Høiland-Jørgensen wrote:
> Erik Stromdahl <erik.stromdahl@...il.com> writes:
> 
>> This patch fixes a possible deadlock when updating the TX statistics
>> (when calling into ieee80211_tx_stats()) from ieee80211_tx_dequeue().
> 
> So is this the fix for the issue with TX scheduling you reported
> earlier? :)
> 

Actually not. I thought so initially, but then, after a few more test runs,
I was able to run into the issue again.

But it does seem to fix the other issue with the RCU stall since I haven't
seen it with this patch applied (could be just a coincidence though).

--
Erik