linux-kernel - Re: e100 REGRESSION in 2.6.32 (PATCH v2)

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Message-ID: <alpine.WNT.2.00.0912170919010.2612@jbrandeb-desk1.amr.corp.intel.com>
Date:	Thu, 17 Dec 2009 09:21:49 -0800 (Pacific Standard Time)
From:	"Brandeburg, Jesse" <jesse.brandeburg@...el.com>
To:	Roger Oksanen <roger.oksanen@...helsinki.fi>
cc:	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)


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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