Make the net_hwtstamp_validate function accessible in prevision to use
it from ethtool to validate the hwtstamp configuration before setting it.

Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
---

Change in v8:
- New patch

Change in v10:
- Remove export symbol as ethtool can't be built as a module.
- Move the declaration to net/core/dev.h instead of netdevice.h
---
 net/core/dev.h       | 1 +
 net/core/dev_ioctl.c | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/core/dev.h b/net/core/dev.h
index a1267cff715e..9653e2ff89f2 100644
--- a/net/core/dev.h
+++ b/net/core/dev.h
@@ -287,5 +287,6 @@ int dev_set_hwtstamp_phylib(struct net_device *dev,
 			    struct netlink_ext_ack *extack);
 int dev_get_hwtstamp_phylib(struct net_device *dev,
 			    struct kernel_hwtstamp_config *cfg);
+int net_hwtstamp_validate(const struct kernel_hwtstamp_config *cfg);
 
 #endif
diff --git a/net/core/dev_ioctl.c b/net/core/dev_ioctl.c
index 0267564664b4..2128dc7f5bfb 100644
--- a/net/core/dev_ioctl.c
+++ b/net/core/dev_ioctl.c
@@ -184,7 +184,7 @@ static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cm
 	return err;
 }
 
-static int net_hwtstamp_validate(const struct kernel_hwtstamp_config *cfg)
+int net_hwtstamp_validate(const struct kernel_hwtstamp_config *cfg)
 {
 	enum hwtstamp_tx_types tx_type;
 	enum hwtstamp_rx_filters rx_filter;

-- 
2.34.1