linux-kernel - Re: [PATCH v2 net-next] net/core: ensure features get disabled on new lower devs

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Message-Id: <20151104.215632.964832400121049446.davem@davemloft.net>
Date:	Wed, 04 Nov 2015 21:56:32 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	jarod@...hat.com
Cc:	linux-kernel@...r.kernel.org, edumazet@...gle.com,
	j.vosburgh@...il.com, vfalico@...il.com, gospo@...ulusnetworks.com,
	jiri@...nulli.us, razor@...ckwall.org, mkubecek@...e.cz,
	alexander.duyck@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH v2 net-next] net/core: ensure features get disabled on
 new lower devs

From: Jarod Wilson <jarod@...hat.com>
Date: Tue,  3 Nov 2015 23:09:32 -0500

> With moving netdev_sync_lower_features() after the .ndo_set_features
> calls, I neglected to verify that devices added *after* a flag had been
> disabled on an upper device were properly added with that flag disabled as
> well. This currently happens, because we exit __netdev_update_features()
> when we see dev->features == features for the upper dev. We can retain the
> optimization of leaving without calling .ndo_set_features with a bit of
> tweaking and a goto here.
> 
> Fixes: fd867d51f889 ("net/core: generic support for disabling netdev features down stack")
 ...
> Reported-by: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
> Signed-off-by: Jarod Wilson <jarod@...hat.com>
> ---
> v2: Based on suggestions from Alex, and with not changing err to ret, this
> patch actually becomes quite minimal and doesn't ugly up the code much.

Applied, thanks.
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