netdev - Re: [patch 10/15] timers: Silently ignore timers with a NULL function

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Message-ID: <87wn7ogeuu.ffs@tglx>
Date:   Mon, 21 Nov 2022 22:46:49 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...uxfoundation.org>,
        Anna-Maria Behnsen <anna-maria@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Julia Lawall <Julia.Lawall@...ia.fr>,
        Arnd Bergmann <arnd@...db.de>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Marc Zyngier <maz@...nel.org>,
        Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        linux-bluetooth@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org
Subject: Re: [patch 10/15] timers: Silently ignore timers with a NULL function

On Mon, Nov 21 2022 at 16:35, Steven Rostedt wrote:
> On Tue, 15 Nov 2022 21:28:49 +0100 (CET)
> Thomas Gleixner <tglx@...utronix.de> wrote:
>> @@ -1532,6 +1573,12 @@ static void expire_timers(struct timer_b
>>  
>>  		fn = timer->function;
>>  
>> +		if (WARN_ON_ONCE(!fn)) {
>> +			/* Should never happen. Emphasis on should! */
>> +			base->running_timer = NULL;
>> +			return;
>
> Why return and not continue?
>
> Wont this drop the other timers in the queue?

Duh. Yes. Thanks for catching that!