Re: [PATCH v2 1/2] wifi: ath11k: fix temperature event locking

From: Kalle Valo <kvalo@kernel.org>
To: Johan Hovold <johan+linaro@kernel.org>
Cc: Jeff Johnson <quic_jjohnson@quicinc.com>,
	 ath11k@lists.infradead.org, linux-wireless@vger.kernel.org,
	 linux-kernel@vger.kernel.org, stable@vger.kernel.org
Subject: Re: [PATCH v2 1/2] wifi: ath11k: fix temperature event locking
Date: Tue, 24 Oct 2023 16:59:35 +0300	[thread overview]
Message-ID: <87sf60xgs8.fsf@kernel.org> (raw)
In-Reply-To: <20231019153115.26401-2-johan+linaro@kernel.org> (Johan Hovold's message of "Thu, 19 Oct 2023 17:31:14 +0200")

Johan Hovold <johan+linaro@kernel.org> writes:

> The ath11k active pdevs are protected by RCU but the temperature event
> handling code calling ath11k_mac_get_ar_by_pdev_id() was not marked as a
> read-side critical section as reported by RCU lockdep:
>
> 	=============================
> 	WARNING: suspicious RCU usage
> 	6.6.0-rc6 #7 Not tainted
> 	-----------------------------
> 	drivers/net/wireless/ath/ath11k/mac.c:638 suspicious rcu_dereference_check() usage!
>
> 	other info that might help us debug this:
>
> 	rcu_scheduler_active = 2, debug_locks = 1
> 	no locks held by swapper/0/0.
> 	...
> 	Call trace:
> 	...
> 	 lockdep_rcu_suspicious+0x16c/0x22c
> 	 ath11k_mac_get_ar_by_pdev_id+0x194/0x1b0 [ath11k]
> 	 ath11k_wmi_tlv_op_rx+0xa84/0x2c1c [ath11k]
> 	 ath11k_htc_rx_completion_handler+0x388/0x510 [ath11k]
>
> Mark the code in question as an RCU read-side critical section to avoid
> any potential use-after-free issues.
>
> Fixes: a41d10348b01 ("ath11k: add thermal sensor device support")
> Cc: stable@vger.kernel.org      # 5.7
> Signed-off-by: Johan Hovold <johan+linaro@kernel.org>

On what hardware and firmware version did you test this? As there's so
many different combos we use Tested-on tag to provide that information
in the commit message:

https://wireless.wiki.kernel.org/en/users/drivers/ath11k/submittingpatches#tested-on_tag

I can add that if you let me know what you used.

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