lkml.org 
[lkml]   [2009]   [Apr]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
Subject[PATCH 2.6.29.1 1/1] 8139too: fix HW initial flow
From
From: Jonathan Lin <tzungder@gmail.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 <tzungder@gmail.com>

--- 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);
+
/* Must enable Tx/Rx before setting transfer thresholds! */
RTL_W8 (ChipCmd, CmdRxEnb | CmdTxEnb);

@@ -1389,8 +1393,6 @@ static void rtl8139_hw_start (struct net
RTL_W32 (RxConfig, tp->rx_config);
RTL_W32 (TxConfig, rtl8139_tx_config);

- tp->cur_rx = 0;
-
rtl_check_media (dev, 1);

if (tp->chipset >= CH_8139B) {
@@ -1405,9 +1407,6 @@ static void rtl8139_hw_start (struct net
/* Lock Config[01234] and BMCR register writes */
RTL_W8 (Cfg9346, Cfg9346_Lock);

- /* init Rx ring buffer DMA address */
- RTL_W32_F (RxBuf, tp->rx_ring_dma);
-
/* init Tx buffer DMA addresses */
for (i = 0; i < NUM_TX_DESC; i++)
RTL_W32_F (TxAddr0 + (i * 4), tp->tx_bufs_dma + (tp->tx_buf[i] -
tp->tx_bufs));

\
 
 \ /
  Last update: 2009-04-20 03:57    [W:0.427 / U:2.308 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site