netdev - Re: [PATCH v5 net-next 06/12] net: ethernet: ti: introduce cpsw switchdev based driver part 1

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Date:   Tue, 29 Oct 2019 13:32:30 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Grygorii Strashko <grygorii.strashko@...com>
Cc:     netdev@...r.kernel.org,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        "David S . Miller" <davem@...emloft.net>,
        Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>,
        Jiri Pirko <jiri@...nulli.us>,
        Florian Fainelli <f.fainelli@...il.com>,
        Sekhar Nori <nsekhar@...com>, linux-kernel@...r.kernel.org,
        linux-omap@...r.kernel.org, Murali Karicheri <m-karicheri2@...com>,
        Ivan Vecera <ivecera@...hat.com>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org
Subject: Re: [PATCH v5 net-next 06/12] net: ethernet: ti: introduce cpsw
  switchdev based driver part 1 - dual-emac

> +static int cpsw_probe(struct platform_device *pdev)
> +{
> +	const struct soc_device_attribute *soc;
> +	struct device *dev = &pdev->dev;
> +	struct resource *ss_res;
> +	struct cpsw_common *cpsw;
> +	struct gpio_descs *mode;
> +	void __iomem *ss_regs;
> +	int ret = 0, ch;
> +	struct clk *clk;
> +	int irq;
> +

...

> +
> +	/* setup netdevs */
> +	ret = cpsw_create_ports(cpsw);
> +	if (ret)
> +		goto clean_unregister_netdev;

At this point, the slave ports go live. If the kernel is configured
with NFS root etc, it will start using the interfaces.

+
> +	/* Grab RX and TX IRQs. Note that we also have RX_THRESHOLD and
> +	 * MISC IRQs which are always kept disabled with this driver so
> +	 * we will not request them.
> +	 *
> +	 * If anyone wants to implement support for those, make sure to
> +	 * first request and append them to irqs_table array.
> +	 */
> +
> +	ret = devm_request_irq(dev, cpsw->irqs_table[0], cpsw_rx_interrupt,
> +			       0, dev_name(dev), cpsw);
> +	if (ret < 0) {
> +		dev_err(dev, "error attaching irq (%d)\n", ret);
> +		goto clean_unregister_netdev;
> +	}
> +
> +	ret = devm_request_irq(dev, cpsw->irqs_table[1], cpsw_tx_interrupt,
> +			       0, dev_name(dev), cpsw);
> +	if (ret < 0) {
> +		dev_err(dev, "error attaching irq (%d)\n", ret);
> +		goto clean_unregister_netdev;
> +	}

Are there any race conditions if the network starts using the devices
before interrupts are requested? To be safe, maybe this should be done
before the slaves are created?

       Andrew