[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <Y4c/UCHxIWZQVwi6@shell.armlinux.org.uk>
Date: Wed, 30 Nov 2022 11:32:32 +0000
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Clark Wang <xiaoning.wang@....com>
Cc: peppe.cavallaro@...com, alexandre.torgue@...s.st.com,
joabreu@...opsys.com, davem@...emloft.net, edumazet@...gle.com,
kuba@...nel.org, pabeni@...hat.com, mcoquelin.stm32@...il.com,
andrew@...n.ch, hkallweit1@...il.com, netdev@...r.kernel.org,
linux-stm32@...md-mailman.stormreply.com,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] net: phylink: add sync flag mac_ready to fix resume
issue with WoL enabled
On Wed, Nov 30, 2022 at 11:23:42AM +0000, Russell King (Oracle) wrote:
> On Wed, Nov 30, 2022 at 07:11:47PM +0800, Clark Wang wrote:
> > Issue we met:
> > On some platforms, mac cannot work after resumed from the suspend with WoL
> > enabled.
> >
> > The cause of the issue:
> > 1. phylink_resolve() is in a workqueue which will not be executed immediately.
> > This is the call sequence:
> > phylink_resolve()->phylink_link_up()->pl->mac_ops->mac_link_up()
> > For stmmac driver, mac_link_up() will set the correct speed/duplex...
> > values which are from link_state.
> > 2. In stmmac_resume(), it will call stmmac_hw_setup() after called the
> > phylink_resume(). stmmac_core_init() is called in function stmmac_hw_setup(),
>
> ... and that is where the problem is. Don't call phylink_resume() before
> your hardware is ready to see a link-up event.
... and while that is being fixed, maybe the stupid code in
stmmac_resume() can also be fixed:
rtnl_lock();
if (device_may_wakeup(priv->device) && priv->plat->pmt) {
phylink_resume(priv->phylink);
} else {
phylink_resume(priv->phylink);
if (device_may_wakeup(priv->device))
phylink_speed_up(priv->phylink);
}
rtnl_unlock();
rtnl_lock();
1. phylink_resume() is always called after that first rtnl_lock(), so
there's no point it being stupidly in each side of the if().
2. the rtnl_unlock() followed by rtnl_lock() is completely unnecessary.
Thanks.
--
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!
Powered by blists - more mailing lists