netdev - Re: Deleting child qdisc doesn't reset parent to default qdisc?

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Message-ID: <1460646099.10638.44.camel@edumazet-glaptop3.roam.corp.google.com>
Date:	Thu, 14 Apr 2016 08:01:39 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jiri Kosina <jikos@...nel.org>
Cc:	Jamal Hadi Salim <jhs@...atatu.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: Deleting child qdisc doesn't reset parent to default qdisc?

On Thu, 2016-04-14 at 16:44 +0200, Jiri Kosina wrote:
> Hi,
> 
> I've came across the behavior where adding a child qdisc and then deleting 
> it again makes the networking dysfunctional (I guess that's because all of 
> a sudden there is absolutely no working qdisc on the device, although 
> there originally was a default one in the parent).
> 
> In a nutshell, is this expected behavior or bug?

This is the expected behavior.

If the kernel was suddenly doing a 'replace' when you ask a delete,
then the scripts doing a delete , than a add would break.

tc users are skilled admins ;)