linux-kernel - Re: [PATCH net-next] net: micrel: Fix set/get PHC time for lan8814

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Date: Fri, 26 Jan 2024 14:15:39 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Vadim Fedorenko <vadim.fedorenko@...ux.dev>
Cc: Horatiu Vultur <horatiu.vultur@...rochip.com>, hkallweit1@...il.com,
	linux@...linux.org.uk, davem@...emloft.net, edumazet@...gle.com,
	kuba@...nel.org, pabeni@...hat.com, richardcochran@...il.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	UNGLinuxDriver@...rochip.com,
	Maxime Chevallier <maxime.chevallier@...tlin.com>,
	Divya Koppera <divya.koppera@...rochip.com>
Subject: Re: [PATCH net-next] net: micrel: Fix set/get PHC time for lan8814

> > +	*sec |= lanphy_read_page_reg(phydev, 4, PTP_CLOCK_READ_SEC_MID);
> 
> lanphy_read_page_reg returns int, but only 16 bits have meanings here.
> Is it safe to assume that other 16 bits will be zeros always?

Yes. __phy_read() should only return a negative error code, or a value
which fits in a u16. If any of the top bits are set, its a bug in the
MDIO driver which needs finding and fixing.

     Andrew