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renesas: reject unsupported external timestamp flags 

Fix the renesas PTP support to explicitly reject any future flags that
get added to the external timestamp request ioctl.

In order to maintain currently functioning code, this patch accepts all
three current flags. This is because the PTP_RISING_EDGE and
PTP_FALLING_EDGE flags have unclear semantics and each driver seems to
have interpreted them slightly differently.

Cc: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Reviewed-by: Richard Cochran <richardcochran@gmail.com>
Reviewed-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jacob Keller 2019-11-14 10:45:01 -08:00 committed by David S. Miller
parent 2e0645a00e
commit 592025a03b
1 changed files with 6 additions and 0 deletions
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6
drivers/net/ethernet/renesas/ravb_ptp.c
View File

@ -182,6 +182,12 @@ static int ravb_ptp_extts(struct ptp_clock_info *ptp,
struct net_device *ndev = priv->ndev;
unsigned long flags;
/* Reject requests with unsupported flags */
if (req->flags & ~(PTP_ENABLE_FEATURE |
PTP_RISING_EDGE |
PTP_FALLING_EDGE))
return -EOPNOTSUPP;
if (req->index)
return -EINVAL;