tree a1ce109f184aab98be6e688c3e36f6a9804e1da8
parent 3df70afe8d33f4977d0e0891bdcfb639320b5257
author Richard Cochran <richardcochran@gmail.com> 1573757095 -0800
committer David S. Miller <davem@davemloft.net> 1573850912 -0800

ptp: Validate requests to enable time stamping of external signals.

Commit 415606588c61 ("PTP: introduce new versions of IOCTLs")
introduced a new external time stamp ioctl that validates the flags.
This patch extends the validation to ensure that at least one rising
or falling edge flag is set when enabling external time stamps.

Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>