netdev - Re: [PATCH net-next v2 5/7] usbnet: smsc95xx: Forward PHY interrupts to PHY driver to avoid polling

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Message-ID: <20220505113207.487861b2@kernel.org>
Date:   Thu, 5 May 2022 11:32:07 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>, Marc Zyngier <maz@...nel.org>
Cc:     Lukas Wunner <lukas@...ner.de>,
        "David S. Miller" <davem@...emloft.net>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-usb@...r.kernel.org,
        Steve Glendinning <steve.glendinning@...well.net>,
        UNGLinuxDriver@...rochip.com, Oliver Neukum <oneukum@...e.com>,
        Andre Edich <andre.edich@...rochip.com>,
        Oleksij Rempel <linux@...pel-privat.de>,
        Martyn Welch <martyn.welch@...labora.com>,
        Gabriel Hojda <ghojda@...urs.ro>,
        Christoph Fritz <chf.fritz@...glemail.com>,
        Lino Sanfilippo <LinoSanfilippo@....de>,
        Philipp Rosenberger <p.rosenberger@...bus.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Russell King <linux@...linux.org.uk>,
        Ferry Toth <fntoth@...il.com>
Subject: Re: [PATCH net-next v2 5/7] usbnet: smsc95xx: Forward PHY
 interrupts to PHY driver to avoid polling

On Tue, 3 May 2022 15:15:05 +0200 Lukas Wunner wrote:
> @@ -608,11 +618,20 @@ static void smsc95xx_status(struct usbnet *dev, struct urb *urb)
>  	intdata = get_unaligned_le32(urb->transfer_buffer);
>  	netif_dbg(dev, link, dev->net, "intdata: 0x%08X\n", intdata);
>  
> +	/* USB interrupts are received in softirq (tasklet) context.
> +	 * Switch to hardirq context to make genirq code happy.
> +	 */
> +	local_irq_save(flags);
> +	__irq_enter_raw();
> +
>  	if (intdata & INT_ENP_PHY_INT_)
> -		;
> +		generic_handle_domain_irq(pdata->irqdomain, PHY_HWIRQ);
>  	else
>  		netdev_warn(dev->net, "unexpected interrupt, intdata=0x%08X\n",
>  			    intdata);
> +
> +	__irq_exit_raw();
> +	local_irq_restore(flags);

IRQ maintainers could you cast your eyes over this?

Full patch:

https://lore.kernel.org/all/c6b7f4e4a17913d2f2bc4fe722df0804c2d6fea7.1651574194.git.lukas@wunner.de/