linux-kernel - Re: [PATCH net-next v4 3/4] net: macb: Add ARP support to WOL

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Message-ID: <a95e3b77-bdda-428e-9d25-f9be017fd40a@lunn.ch>
Date: Tue, 11 Jun 2024 14:57:17 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Vineeth Karumanchi <vineeth.karumanchi@....com>
Cc: nicolas.ferre@...rochip.com, claudiu.beznea@...on.dev,
	davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, robh+dt@...nel.org,
	krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
	linux@...linux.org.uk, vadim.fedorenko@...ux.dev,
	netdev@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, git@....com
Subject: Re: [PATCH net-next v4 3/4] net: macb: Add ARP support to WOL

> > > +	/* Don't manage WoL on MAC if there's a failure in talking to the PHY */
> > > +	if (!!ret && ret != -EOPNOTSUPP)
> > >   		return ret;
> > 
> > The comment is wrong. You could be happily talking to the PHY, it just
> > does not support what you asked it to do.
> > 
> 
> 
> These are the 3 possible return scenarios
> 
> 1. -EOPNOTSUPP. : When there is no PHY or no set_wol() in PHY driver.
> 2. 0 : Success
> 3. any error (-EINVAL, ... ) from set_wol()
> 
> we are returning in case 3.
> 
> The comment can be "Don't manage WoL on MAC, if PHY set_wol() fails"

O.K.

You don't need the !! on ret.

	Andrew