[net-next,v3,7/7] renesas: reject unsupported external timestamp flags
diff mbox series

Message ID 20190926181109.4871-8-jacob.e.keller@intel.com
State Accepted
Delegated to: Jeff Kirsher
Headers show
Series
  • new PTP ioctl fixes
Related show

Commit Message

Keller, Jacob E Sept. 26, 2019, 6:11 p.m. UTC
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>
---
 drivers/net/ethernet/renesas/ravb_ptp.c | 6 ++++++
 1 file changed, 6 insertions(+)

Comments

Sergei Shtylyov Sept. 27, 2019, 4:22 p.m. UTC | #1
On 09/26/2019 09:11 PM, Jacob Keller wrote:

> 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: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>

[...]

MBR, Sergei
Richard Cochran Oct. 12, 2019, 6:38 p.m. UTC | #2
On Thu, Sep 26, 2019 at 11:11:09AM -0700, Jacob Keller wrote:
> 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.

This driver doesn't check the flags. Not knowing this HW, I can't say
which edges are time stamped.
 
> Cc: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
> Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>

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

Patch
diff mbox series

diff --git a/drivers/net/ethernet/renesas/ravb_ptp.c b/drivers/net/ethernet/renesas/ravb_ptp.c
index 638f1fc2166f..666dbee48097 100644
--- a/drivers/net/ethernet/renesas/ravb_ptp.c
+++ b/drivers/net/ethernet/renesas/ravb_ptp.c
@@ -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;