netdev - Re: [PATCH v2 0/7] alx: small fixes/cleanups

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Message-ID: <20130629185620.GA10505@sig21.net>
Date:	Sat, 29 Jun 2013 20:56:20 +0200
From:	Johannes Stezenbach <js@...21.net>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH v2 0/7] alx: small fixes/cleanups

On Sat, Jun 29, 2013 at 07:20:36PM +0200, Johannes Berg wrote:
> On Tue, 2013-06-25 at 23:01 +0200, Johannes Stezenbach wrote:
> > On Tue, Jun 25, 2013 at 08:38:16PM +0200, Johannes Berg wrote:
> > > Thanks to Ben's review mostly, here are some fixes/cleanups in
> > > alx. I'm seriously considering removing WoWLAN as I have no use
> > > for it and am not too motivated to debug it, anyone else want
> > > to try debugging? :)
> > 
> > One thing I noticed is alx_select_powersaving_speed() will return 0
> > when there is no link but leaves *speed uninitialized.
> 
> Yeah, that's a bit odd.
> 
> > Then __alx_shutdown() prints e.g.
> >    alx 0000:03:00.0 eth0: wol: ctrl=3, speed=FFFF8801
> > In this case the
> >   alx_write_phy_reg(hw, ALX_MII_IER, 0);
> > is skipped in alx_select_powersaving_speed().
> > However, it should still be done in alx_pre_suspend()
> > when WOL is disabled.  But it might be we need to move
> > the alx_clear_phy_intr() in __alx_shutdown() down.
> > 
> > I'm also not sure why alx_get_phy_link() reads MII_BMSR
> > twice, but the old driver from compat-wireless-3.6.8-1-snpc
> > also does it, it seems deliberate.
> 
> Yeah, all this looks like magic to me...
> 
> > Unless someone beats me to it I will try to debug
> > on the weekend.
> 
> The whole PCI(e) stuff there looks pretty odd to me and I can't seem to
> fix it right now, so I'm removing it. It really looks like all the
> wakeup_enable() etc. is in the wrong places? Hmmm. Well the code is
> still in the history ;-)

Personally I don't care about WOL, no problem if you remove it.

So far I didn't have time to test (planning to do it tomorrow),
but looking at the code in __alx_shutdown(), I think
__alx_stop() tears down the link (via alx_reset_mac()).
Thus alx_select_powersaving_speed() would need to be
split in two functions, one looking at the current link,
called before __alx_stop(), and one called after it
to re-enable the link.  And alx_clear_phy_intr() needs to be moved
after alx_pre_suspend().  And alx_config_wol() should be
before alx_pre_suspend() according to the alx_pre_suspend() comment.
And alx_select_powersaving_speed() should not be called
when WOL is disabled.


Thanks,
Johannes
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