linux-kernel - Re: [RFC Patch net-next v2] net: dsa: microchip: lan937x: enable interrupt for internal phy link detection

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Message-ID: <YwN9CMMhHDxB8mdj@lunn.ch>
Date:   Mon, 22 Aug 2022 14:56:40 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Arun Ramadoss <arun.ramadoss@...rochip.com>
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Woojung Huh <woojung.huh@...rochip.com>,
        UNGLinuxDriver@...rochip.com,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.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>,
        Russell King <linux@...linux.org.uk>,
        Tristram Ha <Tristram.Ha@...rochip.com>
Subject: Re: [RFC Patch net-next v2] net: dsa: microchip: lan937x: enable
 interrupt for internal phy link detection

> +static irqreturn_t lan937x_switch_irq_thread(int irq, void *dev_id)
> +{
> +	struct ksz_device *dev = dev_id;
> +	irqreturn_t result = IRQ_NONE;
> +	u32 data;
> +	int ret;
> +
> +	/* Read global interrupt status register */
> +	ret = ksz_read32(dev, REG_SW_INT_STATUS__4, &data);
> +	if (ret)
> +		return result;

I don't think you can return negative error numbers here.

> +
> +	if (data & POR_READY_INT) {
> +		ret = ksz_write32(dev, REG_SW_INT_STATUS__4, POR_READY_INT);
> +		if (ret)
> +			return result;

Returning IRQ_NONE here seems wrong. You handle the interrupt, so
should probably return IRQ_HANDLED.

      Andrew