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dp83640: Reject requests to enable time stamping on both edges.

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This driver enables rising edge or falling edge, but not both, and so
this patch validates that the request contains only one of the two
edges.

Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Richard Cochran 2019-11-14 10:45:04 -08:00 committed by David S. Miller
parent c019b4be5d
commit 9289252bd1
1 changed files with 7 additions and 0 deletions
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7
drivers/net/phy/dp83640.c
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@ -475,6 +475,13 @@ static int ptp_dp83640_enable(struct ptp_clock_info *ptp,
PTP_FALLING_EDGE |
PTP_STRICT_FLAGS))
return -EOPNOTSUPP;
/* Reject requests to enable time stamping on both edges. */
if ((rq->extts.flags & PTP_STRICT_FLAGS) &&
(rq->extts.flags & PTP_ENABLE_FEATURE) &&
(rq->extts.flags & PTP_EXTTS_EDGES) == PTP_EXTTS_EDGES)
return -EOPNOTSUPP;
index = rq->extts.index;
if (index >= N_EXT_TS)
return -EINVAL;