linux-kernel - Re: [PATCH] phy: nxp-c45-tja11xx: add interrupt support

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Message-ID: <YILGp+LdyxsRhkb2@lunn.ch>
Date:   Fri, 23 Apr 2021 15:07:51 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     "Radu Pirea (NXP OSS)" <radu-nicolae.pirea@....nxp.com>
Cc:     hkallweit1@...il.com, linux@...linux.org.uk, davem@...emloft.net,
        kuba@...nel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] phy: nxp-c45-tja11xx: add interrupt support

> +static irqreturn_t nxp_c45_handle_interrupt(struct phy_device *phydev)
> +{
> +	irqreturn_t ret = IRQ_NONE;
> +	int irq;
> +
> +	irq = phy_read_mmd(phydev, MDIO_MMD_VEND1, VEND1_PHY_IRQ_STATUS);
> +	if (irq & PHY_IRQ_LINK_EVENT) {
> +		phy_trigger_machine(phydev);
> +		phy_write_mmd(phydev, MDIO_MMD_VEND1, VEND1_PHY_IRQ_ACK,
> +			      PHY_IRQ_LINK_EVENT);

The ordering here is interesting. Could phy_trigger_machine() cause a
second interrupt? Which you then clear without acting upon before
exiting the interrupt handler? I think you should ACK the interrupt
before calling phy_trigger_machine().

       Andrew