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Subject: Re: [PATCHv2] wifi: ath11k: Fix race condition with
 htt_ppdu_stats_info
From:   Kalle Valo <kvalo@kernel.org>
In-Reply-To: <20221124071104.22506-1-quic_kathirve@quicinc.com>
References: <20221124071104.22506-1-quic_kathirve@quicinc.com>
To:     Karthikeyan Kathirvel <quic_kathirve@quicinc.com>
Cc:     <ath11k@lists.infradead.org>, <linux-wireless@vger.kernel.org>,
        Govindaraj Saminathan <quic_gsaminat@quicinc.com>,
        Karthikeyan Kathirvel <quic_kathirve@quicinc.com>
User-Agent: pwcli/0.1.1-git (https://github.com/kvalo/pwcli/) Python/3.7.3
Message-ID: <167001025076.14016.10499660209048981214.kvalo@kernel.org>
Date:   Fri,  2 Dec 2022 19:44:15 +0000 (UTC)
Precedence: bulk

Karthikeyan Kathirvel <quic_kathirve@quicinc.com> wrote:

> A crash happens when running the traffic with multiple clients:
> 
> Crash Signature : Unable to handle kernel paging request at
> virtual address ffffffd700970918 During the crash, PC points to
> "ieee80211_tx_rate_update+0x30/0x68 [mac80211]"
> LR points to "ath11k_dp_htt_htc_t2h_msg_handler+0x5a8/0x8a0 [ath11k]".
> 
> Struct ppdu_stats_info is allocated and accessed from event callback via copy
> engine tasklet, this has a problem when freeing it from ath11k_mac_op_stop().
> 
> Use data_lock during entire ath11k_dp_htt_get_ppdu_desc() call to protect
> struct htt_ppdu_stats_info access and to avoid race condition when accessing it
> from ath11k_mac_op_stop().
> 
> Tested-on: IPQ8074 hw2.0 AHB WLAN.HK.2.7.0.1-01744-QCAHKSWPL_SILICONZ-1
> 
> Signed-off-by: Govindaraj Saminathan <quic_gsaminat@quicinc.com>
> Co-developed-by: Karthikeyan Kathirvel <quic_kathirve@quicinc.com>
> Signed-off-by: Karthikeyan Kathirvel <quic_kathirve@quicinc.com>
> Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>

I cleaned up the commit log.

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/20221124071104.22506-1-quic_kathirve@quicinc.com/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches