linux-kernel - Re: [RFC] ath11k: fix netdev open race

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Date:   Mon, 23 May 2022 22:06:37 +0300
From:   Kalle Valo <kvalo@...nel.org>
To:     Johan Hovold <johan@...nel.org>
Cc:     Johan Hovold <johan+linaro@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, ath11k@...ts.infradead.org,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC] ath11k: fix netdev open race

Johan Hovold <johan@...nel.org> writes:

> On Tue, May 17, 2022 at 12:34:36PM +0200, Johan Hovold wrote:
>> Make sure to allocate resources needed before registering the device.
>> 
>> This specifically avoids having a racing open() trigger a BUG_ON() in
>> mod_timer() when ath11k_mac_op_start() is called before the
>> mon_reap_timer as been set up.
>> 
>> Fixes: d5c65159f289 ("ath11k: driver for Qualcomm IEEE 802.11ax devices")
>> Fixes: 840c36fa727a ("ath11k: dp: stop rx pktlog before suspend")
>> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
>> ---
>
> For completeness:
>
> Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3

Thanks, added in the pending branch.

You submitted this as RFC but do you mind if I apply this anyway? The
patch looks good and passes my tests. But I do wonder why I haven't seen
the crash...

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