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b44: Truncate PHY address

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Some ROMs on embedded devices store incorrect values for
the PHY address of the ethernet device.
It looks like the number is sign-extended.
Truncate the value by applying the PHY-address mask to it.
The patch was tested on a bcm47xx embedded system (where the bug
triggers) and a bcm4400 PCI card.

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Michael Buesch 2008-03-25 18:04:46 +01:00 committed by Jeff Garzik
parent 6ef2977d41
commit 5ea79631c0
1 changed files with 5 additions and 0 deletions
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5
drivers/net/b44.c
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@ -2082,6 +2082,11 @@ static int __devinit b44_get_invariants(struct b44 *bp)
addr = sdev->bus->sprom.et0mac;
bp->phy_addr = sdev->bus->sprom.et0phyaddr;
}
/* Some ROMs have buggy PHY addresses with the high
* bits set (sign extension?). Truncate them to a
* valid PHY address. */
bp->phy_addr &= 0x1F;
memcpy(bp->dev->dev_addr, addr, 6);
if (!is_valid_ether_addr(&bp->dev->dev_addr[0])){