netdev - Re: ethtool occationally fails to communicate with with ucc

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Message-ID: <20130206222438.GK30788@csclub.uwaterloo.ca>
Date:	Wed, 6 Feb 2013 17:24:38 -0500
From:	"Lennart Sorensen" <lsorense@...lub.uwaterloo.ca>
To:	Ben Hutchings <bhutchings@...arflare.com>
Cc:	Li Yang <leoli@...escale.com>, netdev@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: ethtool occationally fails to communicate with with ucc_geth

On Wed, Feb 06, 2013 at 09:08:32PM +0000, Ben Hutchings wrote:
> This seems to be a workaround for a bug in phylib: phy_state_machine()
> calls netif_carrier_on() before adjust_link(), so the TX scheduler can
> start immediately even though the MAC has not been configured.
> 
> A better workaround would be to use netif_carrier_{off,on}() in
> ugeth_{quiesce,activate}() respectively instead of
> netif_device_{detach,attach}().  But I think phylib really ought to be
> fixed.

I am willing to try things, but this is certainly in parts of the network
stack I don't normally poke around in and hence don't know how works.

I just managed to track it down this far. :)

I can try the carrier_off/on in place of the detach/attach and see if
it works.

-- 
Len Sorensen
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