linux-kernel - Re: [PATCH 2.6.27.2] datagram handling routines : mapping/unmapping paged data in soft IRQ

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Message-Id: <20090511.163652.156749735.davem@davemloft.net>
Date:	Mon, 11 May 2009 16:36:52 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	Luc.Goria@...pt-telecom.fr
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	alan@...hat.com
Subject: Re: [PATCH 2.6.27.2] datagram handling routines :
 mapping/unmapping paged data in soft IRQ

From: "Luc Goria" <Luc.Goria@...pt-telecom.fr>
Date: Mon, 11 May 2009 15:32:21 +0200

> 
> Kernel crashes when a network module tries to copy a datagram to iovec in soft IRQ with paged data.
> The problem is that kunmap function can't be called in IRQ.
> All calls to kmap/kunmap fonctions are replaced by calls to kmap_skb_frag/kunmap_skb_frag when paged data are involved.
> 
>  <<datagram.c.patch>> 
> Signed-off-by: Luc GORIA <luc.goria@...pt-telecom.fr>

What network module does this?  You're not supposed to.

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