linux-kernel - Re: [PATCH net v3 2/4] net: dsa: microchip: ptp: Fix checks on irq_find

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Message-ID: <7909a98c-7ef6-4902-a1b4-c2caba47a086@lunn.ch>
Date: Fri, 14 Nov 2025 15:51:31 +0100
From: Andrew Lunn <andrew@...n.ch>
To: "Bastien Curutchet (Schneider Electric)" <bastien.curutchet@...tlin.com>
Cc: Woojung Huh <woojung.huh@...rochip.com>, UNGLinuxDriver@...rochip.com,
	Vladimir Oltean <olteanv@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Richard Cochran <richardcochran@...il.com>,
	Arun Ramadoss <arun.ramadoss@...rochip.com>,
	Pascal Eberhard <pascal.eberhard@...com>,
	Miquèl Raynal <miquel.raynal@...tlin.com>,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net v3 2/4] net: dsa: microchip: ptp: Fix checks on
 irq_find_mapping()

On Fri, Nov 14, 2025 at 08:20:21AM +0100, Bastien Curutchet (Schneider Electric) wrote:
> irq_find_mapping() returns a positive IRQ number or 0 if no IRQ is found
> but it never returns a negative value. However, during the PTP IRQ setup,
> we verify that its returned value isn't negative.
> 
> Fix the irq_find_mapping() check to enter the error path when 0 is
> returned. Return -EINVAL in such case.
> 
> Fixes: cc13ab18b201 ("net: dsa: microchip: ptp: enable interrupt for timestamping")
> Signed-off-by: Bastien Curutchet (Schneider Electric) <bastien.curutchet@...tlin.com>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew