linux-kernel - Re: [PATCH 3/5] net: gianfar: fix device leak when querying time stamp info

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Message-ID: <20250726204931.GS1367887@horms.kernel.org>
Date: Sat, 26 Jul 2025 21:49:31 +0100
From: Simon Horman <horms@...nel.org>
To: Johan Hovold <johan@...nel.org>
Cc: Andrew Lunn <andrew+netdev@...n.ch>,
	"David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Madalin Bucur <madalin.bucur@....com>,
	Claudiu Manoil <claudiu.manoil@....com>,
	Vladimir Oltean <vladimir.oltean@....com>,
	Wei Fang <wei.fang@....com>, Clark Wang <xiaoning.wang@....com>,
	Felix Fietkau <nbd@....name>, Sean Wang <sean.wang@...iatek.com>,
	Lorenzo Bianconi <lorenzo@...nel.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	MD Danish Anwar <danishanwar@...com>,
	Roger Quadros <rogerq@...nel.org>,
	Richard Cochran <richardcochran@...il.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	Yangbo Lu <yangbo.lu@....com>
Subject: Re: [PATCH 3/5] net: gianfar: fix device leak when querying time
 stamp info

On Fri, Jul 25, 2025 at 07:12:11PM +0200, Johan Hovold wrote:
> Make sure to drop the reference to the ptp device taken by
> of_find_device_by_node() when querying the time stamping capabilities.
> 
> Note that holding a reference to the ptp device does not prevent its
> driver data from going away.
> 
> Fixes: 7349a74ea75c ("net: ethernet: gianfar_ethtool: get phc index through drvdata")
> Cc: stable@...r.kernel.org	# 4.18
> Cc: Yangbo Lu <yangbo.lu@....com>
> Signed-off-by: Johan Hovold <johan@...nel.org>

Reviewed-by: Simon Horman <horms@...nel.org>