netdev - Re: Kernel problem

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Message-Id: <20090301.001228.74103701.davem@davemloft.net>
Date:	Sun, 01 Mar 2009 00:12:28 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	herbert@...dor.apana.org.au
Cc:	jarkao2@...il.com, ash@...sky.net, netdev@...r.kernel.org
Subject: Re: Kernel problem

From: Herbert Xu <herbert@...dor.apana.org.au>
Date: Sun, 1 Mar 2009 15:38:01 +0800

> netpoll: Add drop checks to all entry points
> 
> The netpoll entry checks are required to ensure that we don't
> receive normal packets when invoked via netpoll.  Unfortunately
> it only ever worked for the netif_receive_skb/netif_rx entry
> points.  The VLAN (and subsequently GRO) entry point didn't
> have the check and therefore can trigger all sorts of weird
> problems.
> 
> This patch adds the netpoll check to all entry points.
> 
> I'm still uneasy with receiving at all under netpoll (which
> apparently is only used by the out-of-tree kdump code).  The
> reason is it is perfectly legal to receive all data including
> headers into highmem if netpoll is off, but if you try to do
> that with netpoll on and someone gets a printk in an IRQ handler                                             
> you're going to get a nice BUG_ON.
> 
> Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>

I don't blame you for being skitting about skb_bond_should_drop()
:-)

Applied, thanks Herbert!
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