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Message-ID: <f0835218828401ed49ceacbb62c62284f4d99d95.camel@sipsolutions.net>
Date: Fri, 26 Nov 2021 13:02:42 +0100
From: Johannes Berg <johannes@...solutions.net>
To: Bixuan Cui <cuibixuan@...ux.alibaba.com>,
linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
linux-wireless@...r.kernel.org
Cc: davem@...emloft.ne, kuba@...nel.org
Subject: Re: [PATCH -next] mac80211: fix suspicious RCU usage in
ieee80211_set_tx_power()
On Mon, 2021-11-15 at 14:09 +0800, Bixuan Cui wrote:
>
> diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
> index 1ab8483..14fbe9e 100644
> --- a/net/mac80211/cfg.c
> +++ b/net/mac80211/cfg.c
> @@ -2702,14 +2702,19 @@ static int ieee80211_set_tx_power(struct wiphy *wiphy,
> enum nl80211_tx_power_setting txp_type = type;
> bool update_txp_type = false;
> bool has_monitor = false;
> + int ret = 0;
> +
> + rtnl_lock();
>
This will almost certainly result in lockups, or at least lockdep
complaints, that's just wrong.
johannes
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