From fe65e704534de5d0661ebc3466a2b9018945f694 Mon Sep 17 00:00:00 2001
From: Gabriel Paubert <paubert@iram.es>
Date: Mon, 19 Jan 2009 17:18:09 -0800
Subject: mv643xx_eth: prevent interrupt storm on ifconfig down

Contrary to what the docs say, the 'extended interrupt cause' bit in
the interrupt cause register (bit 1) appears to not be maskable on at
least some of the mv643xx_eth platforms, making writing zeroes to the
interrupt mask register but not the extended interrupt mask register
insufficient to stop interrupts from occuring.  Therefore, also write
zeroes to the extended interrupt mask register when shutting down the
port.

This fixes the interrupt storm seen on the Pegasos board when shutting
down the interface.

Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 drivers/net/mv643xx_eth.c | 1 +
 1 file changed, 1 insertion(+)

(limited to 'drivers')

diff --git a/drivers/net/mv643xx_eth.c b/drivers/net/mv643xx_eth.c
index 8c6979a26d6..5f31bbb614a 100644
--- a/drivers/net/mv643xx_eth.c
+++ b/drivers/net/mv643xx_eth.c
@@ -2212,6 +2212,7 @@ static int mv643xx_eth_stop(struct net_device *dev)
 	struct mv643xx_eth_private *mp = netdev_priv(dev);
 	int i;
 
+	wrlp(mp, INT_MASK_EXT, 0x00000000);
 	wrlp(mp, INT_MASK, 0x00000000);
 	rdlp(mp, INT_MASK);
 
-- 
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