netdev - Re: [PATCH net-next 5/5] net: lan966x: Add support for PTP_PF

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Date:   Mon, 25 Apr 2022 22:31:54 +0200
From:   Horatiu Vultur <horatiu.vultur@...rochip.com>
To:     Richard Cochran <richardcochran@...il.com>
CC:     <netdev@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <davem@...emloft.net>,
        <kuba@...nel.org>, <pabeni@...hat.com>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <UNGLinuxDriver@...rochip.com>
Subject: Re: [PATCH net-next 5/5] net: lan966x: Add support for PTP_PF_EXTTS

The 04/24/2022 08:09, Richard Cochran wrote:

Hi Richard,

> 
> On Sun, Apr 24, 2022 at 04:58:24PM +0200, Horatiu Vultur wrote:
> 
> > @@ -321,6 +321,63 @@ irqreturn_t lan966x_ptp_irq_handler(int irq, void *args)
> >       return IRQ_HANDLED;
> >  }
> >
> > +irqreturn_t lan966x_ptp_ext_irq_handler(int irq, void *args)
> > +{
> > +     struct lan966x *lan966x = args;
> > +     struct lan966x_phc *phc;
> > +     unsigned long flags;
> > +     u64 time = 0;
> > +     time64_t s;
> > +     int pin, i;
> > +     s64 ns;
> > +
> > +     if (!(lan_rd(lan966x, PTP_PIN_INTR)))
> > +             return IRQ_NONE;
> > +
> > +     /* Go through all domains and see which pin generated the interrupt */
> > +     for (i = 0; i < LAN966X_PHC_COUNT; ++i) {
> > +             struct ptp_clock_event ptp_event = {0};
> > +
> > +             phc = &lan966x->phc[i];
> > +             pin = ptp_find_pin(phc->clock, PTP_PF_EXTTS, 0);
> 
> Not safe to call ptp_find_pin() from ISR.  See comment in include/linux/ptp_clock_kernel.h

Good catch.
>From what I can see, I should be able to use ptp_find_pin_unlocked.

> 
> Thanks,
> Richard

-- 
/Horatiu