net ax25: Simplify and cleanup the ax25 sysctl handling.

Don't register/unregister every ax25 table in a batch.  Instead register
and unregister per device ax25 sysctls as ax25 devices come and go.

This moves ax25 to be a completely modern sysctl user.  Registering the
sysctls in just the initial network namespace, removing the use of
.child entries that are no longer natively supported by the sysctl core
and taking advantage of the fact that there are no longer any ordering
constraints between registering and unregistering different sysctl
tables.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Acked-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 8 deletions

diff --git a/net/ax25/ax25_dev.c b/net/ax25/ax25_dev.c
index d0de30e89591..3d106767b272 100644
--- a/net/ax25/ax25_dev.c
+++ b/net/ax25/ax25_dev.c
@@ -59,8 +59,6 @@ void ax25_dev_device_up(struct net_device *dev)
                 return;
         }
 
-        ax25_unregister_sysctl();
-
         dev->ax25_ptr     = ax25_dev;
         ax25_dev->dev     = dev;
         dev_hold(dev);
@@ -90,7 +88,7 @@ void ax25_dev_device_up(struct net_device *dev)
         ax25_dev_list  = ax25_dev;
         spin_unlock_bh(&ax25_dev_lock);
 
-        ax25_register_sysctl();
+        ax25_register_dev_sysctl(ax25_dev);
 }
 
 void ax25_dev_device_down(struct net_device *dev)
@@ -100,7 +98,7 @@ void ax25_dev_device_down(struct net_device *dev)
         if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
                 return;
 
-        ax25_unregister_sysctl();
+        ax25_unregister_dev_sysctl(ax25_dev);
 
         spin_lock_bh(&ax25_dev_lock);
 
@@ -120,7 +118,6 @@ void ax25_dev_device_down(struct net_device *dev)
                 spin_unlock_bh(&ax25_dev_lock);
                 dev_put(dev);
                 kfree(ax25_dev);
-                ax25_register_sysctl();
                 return;
         }
 
@@ -130,7 +127,6 @@ void ax25_dev_device_down(struct net_device *dev)
                         spin_unlock_bh(&ax25_dev_lock);
                         dev_put(dev);
                         kfree(ax25_dev);
-                        ax25_register_sysctl();
                         return;
                 }
 
@@ -138,8 +134,6 @@ void ax25_dev_device_down(struct net_device *dev)
         }
         spin_unlock_bh(&ax25_dev_lock);
         dev->ax25_ptr = NULL;
-
-        ax25_register_sysctl();
 }
 
 int ax25_fwd_ioctl(unsigned int cmd, struct ax25_fwd_struct *fwd)