From: Hannes Hering <hannes.hering@linux.vnet.ibm.com>
To: David Howells <dhowells@redhat.com>
Cc: themann@de.ibm.com, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org, ossrosch@linux.vnet.ibm.com,
linuxppc-dev@ozlabs.org, raisch@de.ibm.com, ossthema@de.ibm.com,
osstklei@de.ibm.com, David Miller <davem@davemloft.net>
Subject: Re: [PATCH 2.6.30-rc5] ehea: fix invalid pointer access
Date: Tue, 5 May 2009 13:19:05 +0200 [thread overview]
Message-ID: <200905051319.05806.hannes.hering@linux.vnet.ibm.com> (raw)
In-Reply-To: <25628.1241514687@redhat.com>
On Tuesday 05 May 2009 11:11:27 David Howells wrote:
> Hannes Hering <hannes.hering@linux.vnet.ibm.com> wrote:
>
> > pref = skb_array[x];
> > - prefetchw(pref);
> > - prefetchw(pref + EHEA_CACHE_LINE);
> > + if (pref) {
> > + prefetchw(pref);
> > + prefetchw(pref + EHEA_CACHE_LINE);
>
> Ummm... Is prefetch() or prefetchw() faulting?
>
> David
Hi David,
this is an ehea driver problem, which is occuring when the receive queue runs
empty. The faulting code is more specifically the following line:
pref = (skb_array[x]->data);
Here the access to the struct element data would cause an exception.We could
have made the if block a little smaller.
Regards
Hannes
next prev parent reply other threads:[~2009-05-05 11:19 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-04 16:02 [PATCH 2.6.30-rc5] ehea: fix invalid pointer access Hannes Hering
2009-05-04 18:07 ` David Miller
2009-05-05 9:11 ` David Howells
2009-05-05 11:19 ` Hannes Hering [this message]
2009-05-05 12:19 ` David Howells
2009-05-05 13:45 ` Hannes Hering
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