linux-kernel - Re: [PATCH v2 net 5/7] net/sched: taprio: fix delayed switching to new schedule after timer expiry

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Message-ID: <20231109122440.374wlo5oqk2eua5u@skbuf>
Date:   Thu, 9 Nov 2023 14:24:40 +0200
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Faizal Rahim <faizal.abdul.rahim@...ux.intel.com>
Cc:     Vinicius Costa Gomes <vinicius.gomes@...el.com>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        "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,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 net 5/7] net/sched: taprio: fix delayed switching to
 new schedule after timer expiry

On Tue, Nov 07, 2023 at 06:20:21AM -0500, Faizal Rahim wrote:
>  static void taprio_start_sched(struct Qdisc *sch,
> -			       ktime_t start, struct sched_gate_list *new)
> +			       ktime_t new_base_time,
> +			       struct sched_gate_list *new)
>  {
>  	struct taprio_sched *q = qdisc_priv(sch);
> -	ktime_t expires;
> +	struct sched_gate_list *oper = NULL;

No point in initializing with NULL if this will be overwritten later.

> +	ktime_t expires, start;
>  
>  	if (FULL_OFFLOAD_IS_ENABLED(q->flags))
>  		return;
>  
> +	oper = rcu_dereference_protected(q->oper_sched,
> +					 lockdep_is_held(&q->current_entry_lock));
> +