linux-kernel - Re: Linux-2.6.21 hangs during post boot initialization phase

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Message-ID: <20070428221932.GA24300@hmsreliant.homelinux.net>
Date:	Sat, 28 Apr 2007 18:19:32 -0400
From:	Neil Horman <nhorman@...driver.com>
To:	Peter Williams <pwil3058@...pond.net.au>
Cc:	jgarzik@...ox.com, Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux-2.6.21 hangs during post boot initialization phase

On Sat, Apr 28, 2007 at 09:50:00AM +1000, Peter Williams wrote:
> Neil Horman wrote:
> >On Sat, Apr 28, 2007 at 12:28:28AM +1000, Peter Williams wrote:
> >>Neil Horman wrote:
> >>>On Fri, Apr 27, 2007 at 04:05:11PM +1000, Peter Williams wrote:
> >
> >Damn, This is what happens when I try to do things too quickly.  I missed 
> >one
> >spot in my last patch where I replaced skb with rx_skb.  Its not critical, 
> >but
> >it should improve sis900 performance by quite a bit.  This applies on top 
> >of the
> >last two patches.  Sorry about that.
> >
> >Thanks & Regards
> >Neil
> >
> >Signed-off-by: Neil Horman <nhorman@...driver.com>
> >
> >
> > sis900.c |    2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > 
> >diff --git a/drivers/net/sis900.c b/drivers/net/sis900.c
> >index 7e44939..db59dce 100644
> >--- a/drivers/net/sis900.c
> >+++ b/drivers/net/sis900.c
> >@@ -1790,7 +1790,7 @@ static int sis900_rx(struct net_device *net_dev)
> > 			/* give the socket buffer to upper layers */
> > 			rx_skb = sis_priv->rx_skbuff[entry];
> > 			skb_put(rx_skb, rx_size);
> >-			skb->protocol = eth_type_trans(rx_skb, net_dev);
> >+			rx_skb->protocol = eth_type_trans(rx_skb, net_dev);
> > 			netif_rx(rx_skb);
> > 
> > 			/* some network statistics */
> 
> My system also boots OK after I add this patch.  Can't tell whether it's 
> improved the performance or not.

I've had other report of performance degradation (frames thrown out for not
having a valid protocol assigned to them).   This patch may not improve your
performance per se, but it will certainly not hurt, and its correct (for the
same reason that using a separate skb pointer is correct in all the other lines
in this clause.

Thanks, and sorry again for all the headache.
Neil
 
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