netdev - RE: [PATCH net-next 2/5] ice: add support for auxiliary input/output pins

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Date:   Tue, 29 Jun 2021 19:28:40 +0000
From:   "Keller, Jacob E" <jacob.e.keller@...el.com>
To:     "Keller, Jacob E" <jacob.e.keller@...el.com>,
        Richard Cochran <richardcochran@...il.com>,
        "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "Machnikowski, Maciej" <maciej.machnikowski@...el.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH net-next 2/5] ice: add support for auxiliary input/output
 pins



> -----Original Message-----
> From: Keller, Jacob E <jacob.e.keller@...el.com>
> Sent: Monday, June 28, 2021 3:46 PM
> To: Richard Cochran <richardcochran@...il.com>; Nguyen, Anthony L
> <anthony.l.nguyen@...el.com>
> Cc: davem@...emloft.net; kuba@...nel.org; Machnikowski, Maciej
> <maciej.machnikowski@...el.com>; netdev@...r.kernel.org
> Subject: RE: [PATCH net-next 2/5] ice: add support for auxiliary input/output pins
> 
> 
> 
> > -----Original Message-----
> > From: Richard Cochran <richardcochran@...il.com>
> > Sent: Saturday, June 26, 2021 7:03 AM
> > To: Nguyen, Anthony L <anthony.l.nguyen@...el.com>
> > Cc: davem@...emloft.net; kuba@...nel.org; Machnikowski, Maciej
> > <maciej.machnikowski@...el.com>; netdev@...r.kernel.org; Keller, Jacob E
> > <jacob.e.keller@...el.com>
> > Subject: Re: [PATCH net-next 2/5] ice: add support for auxiliary input/output
> pins
> >
> > On Fri, Jun 25, 2021 at 11:57:30AM -0700, Tony Nguyen wrote:
> >
> > > @@ -783,6 +1064,17 @@ static long ice_ptp_create_clock(struct ice_pf *pf)
> > >  	info = &pf->ptp.info;
> > >  	dev = ice_pf_to_dev(pf);
> > >
> > > +	/* Allocate memory for kernel pins interface */
> > > +	if (info->n_pins) {
> > > +		info->pin_config = devm_kcalloc(dev, info->n_pins,
> > > +						sizeof(*info->pin_config),
> > > +						GFP_KERNEL);
> > > +		if (!info->pin_config) {
> > > +			info->n_pins = 0;
> > > +			return -ENOMEM;
> > > +		}
> > > +	}
> >
> > How is this supposed to worK?
> >
> > - If n_pins is non-zero, there must also be a ptp_caps.verify method,
> >   but you don't provide one.
> >
> 
> Hmm. Yea, that's missing.

Ok, turns out this is only intended for a later patch that adds support for some pins on E810-T devices, but that work wasn't done yet. We need to split this up more, but currently we never set info->n_pins > 0 so this is effectively dead code.

For now, we need to drop this patch from the series.