linux-kernel - Re: [RFC PATCH 4/5] PTP: Add flag for non-periodic output

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Message-ID: <20190813180628.GA4069@localhost>
Date:   Tue, 13 Aug 2019 11:06:28 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     Felipe Balbi <felipe.balbi@...ux.intel.com>
Cc:     netdev@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org,
        "Christopher S . Hall" <christopher.s.hall@...el.com>
Subject: Re: [RFC PATCH 4/5] PTP: Add flag for non-periodic output

On Tue, Aug 13, 2019 at 10:48:21AM -0700, Richard Cochran wrote:
> > +		if (copy_from_user(&req.extts, (void __user *)arg,
> > +				   sizeof(req.extts))) {
> > +			err = -EFAULT;
> > +			break;
> > +		}
> > +		if (req.extts.flags || req.extts.rsv[0]
> > +				|| req.extts.rsv[1]) {
> > +			err = -EINVAL;
> 
> Since the code is mostly the same as in the PTP_EXTTS_REQUEST case,
> maybe just double up the case statements (like in the other) and add
> an extra test for (cmd == PTP_EXTTS_REQUEST2) for this if-block.

Thinking about the drivers, in the case of the legacy ioctls, let's
also be sure to clear the flags and reserved fields before passing
them to the drivers.

Thanks,
Richard