From 0da6d7b331f391d3c0ce52fb5289f7edeb94e280 Mon Sep 17 00:00:00 2001
From: Stephen Hemminger <shemminger@vyatta.com>
Date: Fri, 14 Aug 2009 05:15:15 +0000
Subject: [PATCH] sky2: hold spinlock around phy_power_down

Avoid any possible problems with accessing PHY registers on shutdown.
This is a purely theoretical issue and is not related to any of the
outstanding bug reports. Since receiver and transmitter are already
shutdown and phy interrupts for this device are already disabled,
there should already be enough protection. Suggested by Mike McCormack.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 drivers/net/sky2.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index b75b48e83970..1d3ee03fa648 100644
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -1893,7 +1893,9 @@ static int sky2_down(struct net_device *dev)
 	synchronize_irq(hw->pdev->irq);
 	napi_synchronize(&hw->napi);
 
+	spin_lock_bh(&sky2->phy_lock);
 	sky2_phy_power_down(hw, port);
+	spin_unlock_bh(&sky2->phy_lock);
 
 	/* turn off LED's */
 	sky2_write16(hw, B0_Y2LED, LED_STAT_OFF);
-- 
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