netdev - Re: e100 REGRESSION in 2.6.32 (PATCH v2)

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Date:	Thu, 17 Dec 2009 13:15:04 -0800
From:	Laurent Chavey <chavey@...gle.com>
To:	"Brandeburg, Jesse" <jesse.brandeburg@...el.com>
Cc:	Roger Oksanen <roger.oksanen@...helsinki.fi>,
	Alan Stern <stern@...land.harvard.edu>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	"Allan, Bruce W" <bruce.w.allan@...el.com>,
	"Waskiewicz Jr, Peter P" <peter.p.waskiewicz.jr@...el.com>,
	"Ronciak, John" <john.ronciak@...el.com>,
	"e1000-devel@...ts.sourceforge.net" 
	<e1000-devel@...ts.sourceforge.net>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>
Subject: Re: e100 REGRESSION in 2.6.32 (PATCH v2)

when using DMAPOOL_DEBUG, do we really want to
over-write 	memset(retval, POOL_POISON_ALLOCATED, pool->size);
set in  dma_pool_alloc.


On Thu, Dec 17, 2009 at 9:21 AM, Brandeburg, Jesse
<jesse.brandeburg@...el.com> wrote:
>
> On Thu, 17 Dec 2009, Roger Oksanen wrote:
>> e100: Fix broken cbs accounting due to missing memset.
>>
>> Alan Stern noticed that e100 caused slab corruption.
>> commit 98468efddb101f8a29af974101c17ba513b07be1 changed
>> the allocation of cbs to use dma pools that don't return zeroed memory,
>> especially the cb->status field used to track which cb to clean, causing
>> (the visible) double freeing of skbs and a wrong free cbs count.
>>
>> Now the cbs are explicitly zeroed at allocation time.
>>
>> Reported-by: Alan Stern <stern@...land.harvard.edu>
>> Tested-by: Alan Stern <stern@...land.harvard.edu>
>> Signed-off-by: Roger Oksanen <roger.oksanen@...helsinki.fi>
>
> Change looks reasonable, ACK.
>
> should we also consider a followon patch to zero memory allocated with
> pci_pools?  Seems useful.
>
> Acked-by: Jesse Brandeburg <jesse.brandeburg@...el.com>
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