netdev - Re: [PATCH] r8169: fix broken register writes

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Message-ID: <20100328221924.GG30031@ZenIV.linux.org.uk>
Date:	Sun, 28 Mar 2010 23:19:24 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Fran?ois Romieu <romieu@...zoreil.com>
Cc:	Ben Hutchings <ben@...adent.org.uk>,
	David Miller <davem@...emloft.net>, timo.teras@....fi,
	ivecera@...hat.com, netdev@...r.kernel.org
Subject: Re: [PATCH] r8169: fix broken register writes

On Sun, Mar 28, 2010 at 11:28:58PM +0200, Fran?ois Romieu wrote:
> Ben Hutchings <ben@...adent.org.uk> :
> [...]
> > Thanks Fran?ois.  Which hardware have you tested this on so far ?
> 
> 10ec:8169 (rev 10) / RTL8169sb/8110sb / XID 10000000
> 
> Timo's is a 10ec:8167 / RTL8169sc/8110sc / XID 18000000. He only tested
> the MAC[04] part.

FWIW, XID18000000 here (J7F4) loses MAC4 on shutdown; hadn't tested the patch
yet.  2.6.26 (on that box) and 2.6.31 (on identical mb) work, 2.6.33 doesn't.
I suspect that bisect would lead to commit cc098dc70 (i.e. the place where we
started to set address on shutdown).  One more data point: ifconfig hw ether
done under 2.6.26 did restore the address.  And that's the same function,
isn't it?

Another interesting bit: unlike the older kernel, grep for eth0 in .33 dmesg

eth0: RTL8169sc/8110sc at 0xf87fc000, 00:30:18:a4:65:89, XID 18000000 IRQ 18
r8169: eth0: link down
ADDRCONF(NETDEV_UP): eth0: link is not ready
r8169: eth0: link up
ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready

where with .26 (with the same userland) had

eth0: RTL8169sc/8110sc at 0xf87fc000, 00:30:18:a4:65:89, XID 18000000 IRQ 18
r8169: eth0: link up
ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready

Same for .31 on another box, modulo different address there...
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