linux-kernel - Re: [PATCH] bridge: send correct MTU value in PMTU

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Message-ID: <20080711162457.76afddd7@extreme>
Date:	Fri, 11 Jul 2008 16:24:57 -0700
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	Simon Wunderlich <simon.wunderlich@...03.tu-chemnitz.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] bridge: send correct MTU value in PMTU

On Fri, 11 Jul 2008 19:19:35 +0200
Simon Wunderlich <simon.wunderlich@...03.tu-chemnitz.de> wrote:

> On Fri, Jul 11, 2008 at 08:34:23AM -0700, Stephen Hemminger wrote:
> > On Fri, 11 Jul 2008 14:47:35 +0200
> > Simon Wunderlich <simon.wunderlich@...03.tu-chemnitz.de> wrote:
> > 
> > > [...]
> > 
> > 
> > port should always be non-null so the existing fake_rtable can
> > just go away no?
> 
> I wondered about that too. But since bridge_parent() is also checking port
> for NULL, and the code calling this is carefully checking these cases, i
> assumed that this is quite possible. If you can assert that port is
> non-NULL, we can remove this, but i have to admit that i don't get the
> whole picture to be sure about this.

bridge_parent can only be NULL if the bridge is process of deletion (via RCU).
So if bridge_parent() returns NULL, code should not bother with further processing
and return (dropping skb if this function does that).

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