linux-kernel - Re: [RFC] mac80211: Potential sleep in atomic context in __ieee80211_wake

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Message-ID: <20250819101004.KB4KbEO-@linutronix.de>
Date: Tue, 19 Aug 2025 12:10:04 +0200
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: Yunseong Kim <ysk@...lloc.com>
Cc: Johannes Berg <johannes.berg@...el.com>,
	Clark Williams <clrkwllms@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>, Jiri Kosina <jkosina@...e.cz>,
	Aaron Hill <aa1ronham@...il.com>,
	Lukas Redlinger <rel+kernel@...lox.net>,
	Oleksii Shevchuk <alxchk@...il.com>,
	Toke Høiland-Jørgensen <toke@...hat.com>,
	linux-wireless@...r.kernel.org, linux-rt-devel@...ts.linux.dev,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] mac80211: Potential sleep in atomic context in
 __ieee80211_wake_txqs

On 2025-08-19 01:56:00 [+0900], Yunseong Kim wrote:
> Hi,
Hi,

> I found a potential PREEMPT_RT issue I noticed in __ieee80211_wake_txqs()
> 
>  static void __ieee80211_wake_txqs(struct ieee80211_sub_if_data *sdata, int ac)
>  {
>      ...
>      local_bh_disable();
>      spin_lock(&fq->lock);
>      ...
>  }
> 
> This sequence of local_bh_disable() followed by spin_lock(). On an 

As explained in the previous mail regarding for
inet_twsk_hashdance_schedule(), this is fine.

> Best regards,
> Yunseong Kim

Sebastian