linux-kernel - Re: [PATCH net-next v2 4/8] net: dsa: microchip: Add support for KSZ8463's PTP interrupts

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Message-ID: <20260125133858.5fdb7532@kernel.org>
Date: Sun, 25 Jan 2026 13:38:58 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: "Bastien Curutchet (Schneider Electric)" <bastien.curutchet@...tlin.com>
Cc: Woojung Huh <woojung.huh@...rochip.com>, UNGLinuxDriver@...rochip.com,
 Andrew Lunn <andrew@...n.ch>, Vladimir Oltean <olteanv@...il.com>, "David
 S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Paolo
 Abeni <pabeni@...hat.com>, Richard Cochran <richardcochran@...il.com>,
 Simon Horman <horms@...nel.org>, 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-next v2 4/8] net: dsa: microchip: Add support for
 KSZ8463's PTP interrupts

On Thu, 22 Jan 2026 14:27:38 +0100 Bastien Curutchet (Schneider
Electric) wrote:
> +int ksz8463_ptp_irq_setup(struct dsa_switch *ds)
> +{
> +	struct ksz_device *dev = ds->priv;
> +	const struct ksz_dev_ops *ops = dev->dev_ops;
> +	struct ksz_port *port1, *port2;
> +	struct ksz_irq *ptpirq;
> +	int ret;
> +	int p;
> +
> +	port1 = &dev->ports[0];
> +	port2 = &dev->ports[1];
> +	ptpirq = &port1->ptpirq;
> +
> +	ptpirq->irq_num = irq_find_mapping(dev->girq.domain, KSZ8463_SRC_PTP_INT);
> +	if (!ptpirq->irq_num)
> +		return -EINVAL;
> +
> +	ptpirq->dev = dev;
> +	ptpirq->nirqs = 4;
> +	ptpirq->reg_mask = ops->get_port_addr(p, KSZ8463_PTP_TS_IER);
> +	ptpirq->reg_status = ops->get_port_addr(p, KSZ8463_PTP_TS_ISR);

clang says:

drivers/net/dsa/microchip/ksz_ptp.c:1187:40: warning: variable 'p' is uninitialized when used here [-Wuninitialized]
 1187 |         ptpirq->reg_mask = ops->get_port_addr(p, KSZ8463_PTP_TS_IER);
      |                                               ^
drivers/net/dsa/microchip/ksz_ptp.c:1175:7: note: initialize the variable 'p' to silence this warning
 1175 |         int p;
      |              ^
      |               = 0
-- 
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