linux-kernel - Re: [PATCH v2 1/2] net: sched: make default fifo qdiscs appear in the dump

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Date:   Wed, 08 Mar 2017 07:17:59 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Jiri Kosina <jikos@...nel.org>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Phil Sutter <phil@....cc>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] net: sched: make default fifo qdiscs appear in
 the dump

On Wed, 2017-03-08 at 13:03 +0100, Jiri Kosina wrote:


> +++ b/net/sched/sch_qfq.c
> @@ -494,6 +494,8 @@ static int qfq_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
>  			goto destroy_class;
>  	}
>  
> +	if (cl->qdisc != &noop_qdisc)
> +		qdisc_hash_add(cl->qdisc, true);


Please move the test in qdisc_hash_add() instead of copy/pasting it all
over the places ?

This is control path, keep it small, thanks !