netdev - Re: [PATCH] b44: Truncate PHY address

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Date:	Tue, 25 Mar 2008 23:20:49 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Michael Buesch <mb@...sch.de>
CC:	agb@...nwrt.org, Gary Zambrano <zambrano@...adcom.com>,
	netdev@...r.kernel.org
Subject: Re: [PATCH] b44: Truncate PHY address

Michael Buesch wrote:
> 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@...sch.de>
> 
> ---
> 
> Jeff, this is a bugfix for 2.6.25.
> 
> 
> Index: wireless-testing/drivers/net/b44.c
> ===================================================================
> --- wireless-testing.orig/drivers/net/b44.c	2008-02-16 19:08:12.000000000 +0100
> +++ wireless-testing/drivers/net/b44.c	2008-03-22 01:13:21.000000000 +0100
> @@ -2082,6 +2082,11 @@ static int __devinit b44_get_invariants(
>  		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);

applied


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