netdev - Re: [PATCH 2.6.29.1 1/1] 8139too: fix HW initial flow

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Message-ID: <20090420132800.GA9119@ubuntu>
Date:	Mon, 20 Apr 2009 21:28:00 +0800
From:	Amos Kong <jianjun@...ux.org>
To:	jon.lin@...ics.com
Cc:	davem@...emloft.net, dada1@...mosbay.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2.6.29.1 1/1] 8139too: fix HW initial flow

On Mon, Apr 20, 2009 at 08:58:01PM +0800, jon.lin@...ics.com wrote:
>From: Jonathan Lin <jon.lin@...ics.com>
>
>While ifconfig eth0 up kernel calls open() of 8139 driver(8139too.c).
>In rtl8139_hw_start() of rtl8139_open(), 8139 driver enable RX before setting up the DMA buffer address. In this interval where RX was enabled and DMA buffer address is not yet set up, any incoming broadcast packet would be send to a strange physical address:
>0x003e8800 which is the default value of DMA buffer address.
>Unfortunately, this address is used by Linux kernel. So kernel panics.
>This patch fix it by setting up DMA buffer address before RX enabled and everything is fine even under broadcast packets attack.
>
>Signed-off-by: Jonathan Lin <jon.lin@...ics.com>

Reviewed-by: Amos Kong <jianjun@...ux.org>

>--- linux-2.6.29.1/drivers/net/8139too.c.orig   2009-04-19 17:50:38.000000000 +0800
>+++ linux-2.6.29.1/drivers/net/8139too.c        2009-04-19 17:52:51.000000000 +0800
>@@ -1382,6 +1382,10 @@ static void rtl8139_hw_start (struct net
>        RTL_W32_F (MAC0 + 0, le32_to_cpu (*(__le32 *) (dev->dev_addr + 0)));
>        RTL_W32_F (MAC0 + 4, le16_to_cpu (*(__le16 *) (dev->dev_addr + 4)));
>
>+       tp->cur_rx = 0;
>+       /* init Rx ring buffer DMA address BEFORE Rx enabled*/
>+       RTL_W32_F (RxBuf, tp->rx_ring_dma);
>+
...
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