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Date: Fri, 21 Oct 2022 18:35:09 +0900 From: Kunihiko Hayashi <hayashi.kunihiko@...ionext.com> To: Heiner Kallweit <hkallweit1@...il.com>, Andrew Lunn <andrew@...n.ch>, Russell King <linux@...linux.org.uk>, "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com> Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH net] net: phy: Avoid WARN_ON for PHY_NOLINK during resuming Hi Heiner, Thank you for your comment. On 2022/10/21 17:38, Heiner Kallweit wrote: > On 21.10.2022 09:41, Kunihiko Hayashi wrote: >> When resuming from sleep, if there is a time lag from link-down to link-up >> due to auto-negotiation, the phy status has been still PHY_NOLINK, so >> WARN_ON dump occurs in mdio_bus_phy_resume(). For example, UniPhier AVE >> ethernet takes about a few seconds to link up after resuming. >> > That autoneg takes some time is normal. If this would actually the root > cause then basically every driver should be affected. But it's not. Although the auto-neg should happen normally, I'm not sure about other platforms. >> To avoid this issue, should remove PHY_NOLINK the WARN_ON conditions. >> >> Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@...ionext.com> >> --- >> drivers/net/phy/phy_device.c | 8 ++++---- >> 1 file changed, 4 insertions(+), 4 deletions(-) >> >> diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c >> index 57849ac0384e..c647d027bb5d 100644 >> --- a/drivers/net/phy/phy_device.c >> +++ b/drivers/net/phy/phy_device.c >> @@ -318,12 +318,12 @@ static __maybe_unused int mdio_bus_phy_resume(struct >> device *dev) >> phydev->suspended_by_mdio_bus = 0; >> >> /* If we managed to get here with the PHY state machine in a state >> - * neither PHY_HALTED, PHY_READY nor PHY_UP, this is an indication >> - * that something went wrong and we should most likely be using >> - * MAC managed PM, but we are not. >> + * neither PHY_HALTED, PHY_READY, PHY_UP nor PHY_NOLINK, this is an >> + * indication that something went wrong and we should most likely >> + * be using MAC managed PM, but we are not. >> */ > > Did you read the comment you're changing? ave_resume() calls phy_resume(), > so you should follow the advice in the comment. I understand something is wrong with "PHY_NOLINK" here, and need to investigate the root cause of the phy state issue. Thank you, --- Best Regards Kunihiko Hayashi
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