netdev - Re: [net-next v3 2/7] net: reject PTP periodic output requests with unsupported flags

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Date:   Sat, 12 Oct 2019 11:08:56 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     Jacob Keller <jacob.e.keller@...el.com>
Cc:     netdev@...r.kernel.org,
        Intel Wired LAN <intel-wired-lan@...ts.osuosl.org>,
        Jeffrey Kirsher <jeffrey.t.kirsher@...el.com>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        "David S . Miller" <davem@...emloft.net>,
        Christopher Hall <christopher.s.hall@...el.com>
Subject: Re: [net-next v3 2/7] net: reject PTP periodic output requests with
 unsupported flags

On Thu, Sep 26, 2019 at 11:11:04AM -0700, Jacob Keller wrote:
> Commit 823eb2a3c4c7 ("PTP: add support for one-shot output") introduced
> a new flag for the PTP periodic output request ioctl. This flag is not
> currently supported by any driver.
> 
> Fix all drivers which implement the periodic output request ioctl to
> explicitly reject any request with flags they do not understand. This
> ensures that the driver does not accidentally misinterpret the
> PTP_PEROUT_ONE_SHOT flag, or any new flag introduced in the future.
> 
> This is important for forward compatibility: if a new flag is
> introduced, the driver should reject requests to enable the flag until
> the driver has actually been modified to support the flag in question.
> 
> Cc: Richard Cochran <richardcochran@...il.com>
> Cc: Felipe Balbi <felipe.balbi@...ux.intel.com>
> Cc: David S. Miller <davem@...emloft.net>
> Cc: Christopher Hall <christopher.s.hall@...el.com>
> Signed-off-by: Jacob Keller <jacob.e.keller@...el.com>

Reviewed-by: Richard Cochran <richardcochran@...il.com>