linux-kernel - Re: [PATCH] wifi: mac80211_hwsim: Prevent tsf from setting if beacon is disabled

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Message-ID: <b30cc04676a031db8c36df243160992094b3848d.camel@sipsolutions.net>
Date: Wed, 23 Apr 2025 14:53:53 +0200
From: Johannes Berg <johannes@...solutions.net>
To: Edward Adam Davis <eadavis@...com>, 
	syzbot+064815c6cd721082a52a@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org, 
	netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [PATCH] wifi: mac80211_hwsim: Prevent tsf from setting if
 beacon is disabled

On Sun, 2025-04-13 at 14:11 +0800, Edward Adam Davis wrote:
> 
> --- a/drivers/net/wireless/virtual/mac80211_hwsim.c
> +++ b/drivers/net/wireless/virtual/mac80211_hwsim.c
> @@ -1226,6 +1226,11 @@ static void mac80211_hwsim_set_tsf(struct ieee80211_hw *hw,
>  {
>  	struct mac80211_hwsim_data *data = hw->priv;
>  	u64 now = mac80211_hwsim_get_tsf(hw, vif);
> +	struct ieee80211_bss_conf *conf = link_conf_dereference_protected(vif,
> +			data->link_data[0].link_id);
> +
> +	if (conf && !conf->enable_beacon)
> +		return;
>  	/* MLD not supported here */
>  	u32 bcn_int = data->link_data[0].beacon_int;
>  	u64 delta = abs(tsf - now);

Please keep kernel coding style - the line break there is awful (but
with "conf = ..." on a line by itself it can be just one line), and you
shouldn't have code before variable declarations.

The comment should probably also move because it's relevant for your new
[0] as well.

johannes