linux-kernel - Re: [PATCH 1/2] wifi: ath12k: fix dfs-radar and temperature event locking

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Message-ID: <3cb5372a-aa11-4184-8f3d-969ee25e0642@quicinc.com>
Date:   Thu, 19 Oct 2023 10:30:56 -0700
From:   Jeff Johnson <quic_jjohnson@...cinc.com>
To:     Johan Hovold <johan+linaro@...nel.org>,
        Kalle Valo <kvalo@...nel.org>
CC:     <ath12k@...ts.infradead.org>, <linux-wireless@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>
Subject: Re: [PATCH 1/2] wifi: ath12k: fix dfs-radar and temperature event
 locking

On 10/19/2023 4:36 AM, Johan Hovold wrote:
> The ath12k active pdevs are protected by RCU but the DFS-radar and
> temperature event handling code calling ath12k_mac_get_ar_by_pdev_id()
> was not marked as a read-side critical section.
> 
> Mark the code in question as RCU read-side critical sections to avoid
> any potential use-after-free issues.
> 
> Note that the temperature event handler looks like a place holder
> currently but would still trigger an RCU lockdep splat.
> 
> Fixes: d889913205cf ("wifi: ath12k: driver for Qualcomm Wi-Fi 7 devices")
> Cc: stable@...r.kernel.org	# v6.2
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
Acked-by: Jeff Johnson <quic_jjohnson@...cinc.com>