netdev - Re: [PATCH net-next v5 6/6] net: mscc: PTP Hardware Clock (PHC) support

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Message-ID: <20190812084943.GG3698@kwain>
Date:   Mon, 12 Aug 2019 10:49:43 +0200
From:   Antoine Tenart <antoine.tenart@...tlin.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Antoine Tenart <antoine.tenart@...tlin.com>, davem@...emloft.net,
        richardcochran@...il.com, alexandre.belloni@...tlin.com,
        UNGLinuxDriver@...rochip.com, netdev@...r.kernel.org,
        thomas.petazzoni@...tlin.com, allan.nielsen@...rochip.com
Subject: Re: [PATCH net-next v5 6/6] net: mscc: PTP Hardware Clock (PHC)
 support

Hi Andrew,

On Sat, Aug 10, 2019 at 07:32:24PM +0200, Andrew Lunn wrote:
> > @@ -596,11 +606,53 @@ static int ocelot_port_xmit(struct sk_buff *skb, struct net_device *dev)
> >  
> >  	dev->stats.tx_packets++;
> >  	dev->stats.tx_bytes += skb->len;
> > -	dev_kfree_skb_any(skb);
> > +
> > +	if (ocelot->ptp && shinfo->tx_flags & SKBTX_HW_TSTAMP &&
> > +	    port->ptp_cmd == IFH_REW_OP_TWO_STEP_PTP) {
> > +		struct ocelot_skb *oskb =
> > +			kzalloc(sizeof(struct ocelot_skb), GFP_ATOMIC);
> > +
> > +		skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
> > +
> > +		oskb->skb = skb;
> 
> You have not checked if oskb == NULL. The allocation could of failed.

Will fix.

> > +	irq_ptp_rdy = platform_get_irq_byname(pdev, "ptp_rdy");
> > +	if (irq_ptp_rdy > 0) {
> 
> I wonder if this should be
> 
> > +	if (irq_ptp_rdy > 0 && ocelot->targets[PTP]) {
> 
> There is not much you can do in the PTP interrupt handler if you don't
> have the PTP registers. In fact, bad things might happen if it tried
> to handle such an interrupt.

That's right, the IRQ could be described and the register bank not. I'll
fix that.

> > +		err = devm_request_threaded_irq(&pdev->dev, irq_ptp_rdy, NULL,
> > +						ocelot_ptp_rdy_irq_handler,
> > +						IRQF_ONESHOT, "ptp ready",
> > +						ocelot);
> > +		if (err)
> > +			return err;
> > +
> > +		/* Check if we can support PTP */
> > +		if (ocelot->targets[PTP])
> > +			ocelot->ptp = 1;
> > +	}

Thanks!
Antoine

-- 
Antoine Ténart, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com