From bc0da3fcec1cec11dc451b8fcb9c9ad7e4ca6e12 Mon Sep 17 00:00:00 2001
From: Martin Langer <martin-langer@gmx.de>
Date: Mon, 13 Oct 2008 18:49:38 -0700
Subject: de2104x: wrong MAC address fix
The de2104x returns sometimes a wrong MAC address. The wrong one is
like the original one, but it comes with an one byte shift. I found
this bug on an older alpha ev5 cpu. More details are available in Gentoo
bugreport #240718.
It seems the hardware is sometimes a little bit too slow for an
immediate access. This patch solves the problem by introducing a small
udelay.
Signed-off-by: Martin Langer <martin-langer@gmx.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
drivers/net/tulip/de2104x.c | 1 +
1 file changed, 1 insertion(+)
(limited to 'drivers')
diff --git a/drivers/net/tulip/de2104x.c b/drivers/net/tulip/de2104x.c
index f54c45049d50..124d5d690dde 100644
--- a/drivers/net/tulip/de2104x.c
+++ b/drivers/net/tulip/de2104x.c
@@ -1688,6 +1688,7 @@ static void __devinit de21040_get_mac_address (struct de_private *de)
unsigned i;
dw32 (ROMCmd, 0); /* Reset the pointer with a dummy write. */
+ udelay(5);
for (i = 0; i < 6; i++) {
int value, boguscnt = 100000;
--
cgit v1.2.3-70-g09d2