netdev - Re: [net-next PATCH 1/3] net: phy: extend PHY package API to support multiple global address

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Message-ID: <4759bf58-0e9f-4d06-8b8a-d33df378c003@lunn.ch>
Date: Sun, 26 Nov 2023 20:39:39 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Christian Marangi <ansuelsmth@...il.com>
Cc: Florian Fainelli <florian.fainelli@...adcom.com>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	Heiner Kallweit <hkallweit1@...il.com>,
	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>,
	Vladimir Oltean <olteanv@...il.com>,
	David Epping <david.epping@...singlinkelectronics.com>,
	Harini Katakam <harini.katakam@....com>,
	"Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [net-next PATCH 1/3] net: phy: extend PHY package API to support
 multiple global address

> Well yes I think we should assume those API to be called only in
> config_once context or in package context. But is it Panic ok? I would
> at least use something like BUG() to give descriptive warning instead of
> NULL pointer exception. What do you think?

BUG() is way too strong. It causes an immediate stop of everything,
and probably file system data loss and a reboot. WARN_ON() is
generally no better.

An Opps gives a stack trace, which is what you need to find the bug,
and kills the process. Generally, you can do a controlled shutdown,
without any losses.

	Andrew