linux-kernel - Re: PROBLEM: iwlagn kernel 2.6.32.3 ooops

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Date:	Tue, 9 Feb 2010 17:52:48 +0100
From:	Stanislaw Gruszka <sgruszka@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	lkml@...nk-Future.de,
	Linux Kernel-Liste <linux-kernel@...r.kernel.org>,
	Reinette Chatre <reinette.chatre@...el.com>,
	ilw@...ux.intel.com, linux-wireless@...r.kernel.org
Subject: Re: PROBLEM: iwlagn kernel 2.6.32.3 ooops

On Mon, Feb 08, 2010 at 02:31:18PM -0800, Andrew Morton wrote:
> On Sat, 6 Feb 2010 18:03:50 +0100
> lkml@...nk-Future.de wrote:
> 
> >   Hi, 
> 
> Suitable cc's added, more below...
> 
> > This ooops happens on kernel 2.6.32.3. On a .32.7 it didn't 
> > happen yet. Maybe fixed, maybe not.
> > 
> > Keywords (i.e., modules, networking, kernel):
> > iwlagn, kernel 2.6.32.3
> > 
> > 
> > Below two msgs:
> > The first is the ooops that occurred when using the box as usual (IRC: after 
> > this crash no rmmod && modprobe have been possible).
> > 
> > The second - IRC - when the iwlagn module crashed, rebooted, crashed differently, 
> > was then removed after the different ooops and re-modprobed.
> > 
> > 
> > [250420.677157] ip: page allocation failure. order:3, mode:0x8020
> 
> This one isn't an "oops" - it's a warning that a memory allocation
> attempt failed.  Which is hardly surprising: an order-3 GFP_ATOMIC
> allocation is highly unreliable and the driver just shouldn't be
> attempting it.
> 
> > [250420.677168] Pid: 11584, comm: ip Not tainted 2.6.32.3 #5
> > [250420.677173] Call Trace:
> > [250420.677190]  [<c10a53f8>] ? __alloc_pages_nodemask+0x518/0x5f0
> > [250420.677204]  [<c1007c20>] ? dma_generic_alloc_coherent+0x0/0x100
> > [250420.677214]  [<c1007c92>] ? dma_generic_alloc_coherent+0x72/0x100
> > [250420.677224]  [<c1007c20>] ? dma_generic_alloc_coherent+0x0/0x100
> > [250420.677241]  [<fca1c9d5>] ? iwl_tx_queue_init+0x285/0x380 [iwlcore]

That is at initialization time. To avoid atomic allocation we can just
use dma_alloc_coherent instead of pci_alloc_consistent. I'm going to
prepare a patch.

Stanislaw
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