linux-kernel - Re: [PATCH net] net: sysfs: Fix deadlock situation in sysfs accesses

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Message-ID: <c0a07217-df63-4b5d-b1a5-13b386b0d7d7@lunn.ch>
Date: Tue, 17 Dec 2024 16:30:54 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Christophe Leroy <christophe.leroy@...roup.eu>
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Simon Horman <horms@...nel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	Maxime Chevallier <maxime.chevallier@...tlin.com>,
	TRINH THAI Florent <florent.trinh-thai@...soprasteria.com>,
	CASAUBON Jean Michel <jean-michel.casaubon@...soprasteria.com>
Subject: Re: [PATCH net] net: sysfs: Fix deadlock situation in sysfs accesses

On Tue, Dec 17, 2024 at 08:18:25AM +0100, Christophe Leroy wrote:
> The following problem is encountered on kernel built with
> CONFIG_PREEMPT. An snmp daemon running with normal priority is
> regularly calling ioctl(SIOCGMIIPHY).

Why is an SNMP daemon using that IOCTL? What MAC driver is this? Is it
using phylib? For phylib, that IOCTL is supposed to be for debug only,
and is a bit of a foot gun. So i would not recommend it.

    Andrew