[PATCH v4 7/7] net: register debugfs file for net_device refcnt tracker

[Jeff Layton <jlayton@kernel.org>]

As a nearly-final step in register_netdevice(), finalize the name in the
refcount tracker, and register a debugfs file for it.

Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
 net/core/dev.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index 2f7f5fd9ffec7c0fc219eb6ba57d57a55134186e..377a19240f2b774281088d91e7da3e4b6ec52e33 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -10834,8 +10834,9 @@ static void netdev_free_phy_link_topology(struct net_device *dev)
  */
 int register_netdevice(struct net_device *dev)
 {
-	int ret;
 	struct net *net = dev_net(dev);
+	char name[NAME_MAX + 1];
+	int ret;
 
 	BUILD_BUG_ON(sizeof(netdev_features_t) * BITS_PER_BYTE <
 		     NETDEV_FEATURE_COUNT);
@@ -10994,6 +10995,9 @@ int register_netdevice(struct net_device *dev)
 	    dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
 		rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL, 0, NULL);
 
+	/* Register debugfs file for the refcount tracker */
+	if (snprintf(name, sizeof(name), "netdev-%s@%p", dev->name, dev) < sizeof(name))
+		ref_tracker_dir_debugfs(&dev->refcnt_tracker, name);
 out:
 	return ret;
 

-- 
2.49.0