linux-kernel - RE: [PATCH 6/6] ptp_ocelot: support 4 programmable pins

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Date:   Tue, 31 Mar 2020 04:18:10 +0000
From:   "Y.b. Lu" <yangbo.lu@....com>
To:     Richard Cochran <richardcochran@...il.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>
Subject: RE: [PATCH 6/6] ptp_ocelot: support 4 programmable pins

> -----Original Message-----
> From: Y.b. Lu
> Sent: Friday, March 27, 2020 1:48 PM
> To: Richard Cochran <richardcochran@...il.com>
> Cc: linux-kernel@...r.kernel.org; netdev@...r.kernel.org; David S . Miller
> <davem@...emloft.net>; Vladimir Oltean <vladimir.oltean@....com>;
> Claudiu Manoil <claudiu.manoil@....com>; Andrew Lunn <andrew@...n.ch>;
> Vivien Didelot <vivien.didelot@...il.com>; Florian Fainelli
> <f.fainelli@...il.com>; Alexandre Belloni <alexandre.belloni@...tlin.com>;
> Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>
> Subject: RE: [PATCH 6/6] ptp_ocelot: support 4 programmable pins
> 
> > -----Original Message-----
> > From: Richard Cochran <richardcochran@...il.com>
> > Sent: Thursday, March 26, 2020 10:00 PM
> > To: Y.b. Lu <yangbo.lu@....com>
> > Cc: linux-kernel@...r.kernel.org; netdev@...r.kernel.org; David S . Miller
> > <davem@...emloft.net>; Vladimir Oltean <vladimir.oltean@....com>;
> > Claudiu Manoil <claudiu.manoil@....com>; Andrew Lunn
> <andrew@...n.ch>;
> > Vivien Didelot <vivien.didelot@...il.com>; Florian Fainelli
> > <f.fainelli@...il.com>; Alexandre Belloni <alexandre.belloni@...tlin.com>;
> > Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>
> > Subject: Re: [PATCH 6/6] ptp_ocelot: support 4 programmable pins
> >
> > On Thu, Mar 26, 2020 at 09:34:52AM +0000, Y.b. Lu wrote:
> > > > Of course, that is horrible, and I am going to find a way to fix it.
> > >
> > > Thanks a lot.
> > > Do you think it is ok to move protection into ptp_set_pinfunc() to protect
> > just pin_config accessing?
> > > ptp_disable_pinfunc() not touching pin_config could be out of protection.
> > > But it seems indeed total ptp_set_pinfunc() should be under protection...
> >
> > Yes, and I have way to fix that.  I will post a patch soon...
> >
> > > I could modify commit messages to indicate the pin supports both
> > PTP_PF_PEROUT and PTP_PF_EXTTS, and PTP_PF_EXTTS support will be
> added
> > in the future.
> >
> > Thanks for explaining.  Since you do have programmable pin, please
> > wait for my patch to fix the deadlock.
> 
> Thanks a lot. Will wait your fix-up.

I see the fix-up was merged. Thanks Richard.
62582a7 ptp: Avoid deadlocks in the programmable pin code.

I just sent out v2 patch-set based on that:)

> 
> Best regards,
> Yangbo Lu
> 
> >
> > Thanks,
> > Richard