linux-kernel - Re: [PATCH v2] ath10k: hold RCU lock when calling ieee80211_find_sta_by

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Message-Id: <20210211182650.B6B85C433ED@smtp.codeaurora.org>
Date:   Thu, 11 Feb 2021 18:26:50 +0000 (UTC)
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Shuah Khan <skhan@...uxfoundation.org>
Cc:     davem@...emloft.net, kuba@...nel.org,
        Shuah Khan <skhan@...uxfoundation.org>,
        ath10k@...ts.infradead.org, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] ath10k: hold RCU lock when calling
 ieee80211_find_sta_by_ifaddr()

Shuah Khan <skhan@...uxfoundation.org> wrote:

> ieee80211_find_sta_by_ifaddr() must be called under the RCU lock and
> the resulting pointer is only valid under RCU lock as well.
> 
> Fix ath10k_wmi_tlv_op_pull_peer_stats_info() to hold RCU lock before it
> calls ieee80211_find_sta_by_ifaddr() and release it when the resulting
> pointer is no longer needed.
> 
> This problem was found while reviewing code to debug RCU warn from
> ath10k_wmi_tlv_parse_peer_stats_info().
> 
> Link: https://lore.kernel.org/linux-wireless/7230c9e5-2632-b77e-c4f9-10eca557a5bb@linuxfoundation.org/
> Signed-off-by: Shuah Khan <skhan@...uxfoundation.org>
> Signed-off-by: Kalle Valo <kvalo@...eaurora.org>

Patch applied to ath-next branch of ath.git, thanks.

09078368d516 ath10k: hold RCU lock when calling ieee80211_find_sta_by_ifaddr()

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/20210210212107.40373-1-skhan@linuxfoundation.org/

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