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de2104x: wrong MAC address fix

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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>
This commit is contained in:
Martin Langer 2008-10-13 18:49:38 -07:00 committed by David S. Miller
parent ebe05d06a5
commit bc0da3fcec
1 changed files with 1 additions and 0 deletions
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drivers/net/tulip/de2104x.c
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@ -1688,6 +1688,7 @@ static void __devinit de21040_get_mac_address (struct de_private *de)
unsigned i; unsigned i;
dw32 (ROMCmd, 0); /* Reset the pointer with a dummy write. */ dw32 (ROMCmd, 0); /* Reset the pointer with a dummy write. */
udelay(5);
for (i = 0; i < 6; i++) { for (i = 0; i < 6; i++) {
int value, boguscnt = 100000; int value, boguscnt = 100000;