netdev - Re: [PATCH net-next] net: pcs: lynx: fix lynx_pcs_link_up_sgmii() not doing anything in fixed-link mode

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Date: Fri, 11 Aug 2023 12:55:53 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Vladimir Oltean <vladimir.oltean@....com>
Cc: netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Camelia Groza <camelia.groza@....com>,
	Ioana Ciornei <ioana.ciornei@....com>, Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>
Subject: Re: [PATCH net-next] net: pcs: lynx: fix lynx_pcs_link_up_sgmii()
 not doing anything in fixed-link mode

On Fri, Aug 11, 2023 at 02:53:52PM +0300, Vladimir Oltean wrote:
> lynx_pcs_link_up_sgmii() is supposed to update the PCS speed and duplex
> for the non-inband operating modes, and prior to the blamed commit, it
> did just that, but a mistake sneaked into the conversion and reversed
> the condition.

Yes, it certainly looks that way, thanks for catching this.

> It is easy for this to go undetected on platforms that also initialize
> the PCS in the bootloader, because Linux doesn't reset it (although
> maybe it should). The nature of the bug is that phylink will not touch
> the IF_MODE_HALF_DUPLEX | IF_MODE_SPEED_MSK fields when it should, and
> it will apparently keep working if the previous values set by the
> bootloader were correct.
> 
> Fixes: c689a6528c22 ("net: pcs: lynx: update PCS driver to use neg_mode")
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>

Reviewed-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>

Thanks!

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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