[NET]: Add __dev_getfirstbyhwtype

Add __dev_getfirstbyhwtype for callers that don't want a reference but
some data from the device and thus need to take the rtnl anyway.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 17 insertions, 5 deletions

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index ac0c92b1e002..4428f1c3c13c 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -582,6 +582,7 @@ extern int 			netdev_boot_setup_check(struct net_device *dev);
 extern unsigned long            netdev_boot_base(const char *prefix, int unit);
 extern struct net_device    *dev_getbyhwaddr(unsigned short type, char *hwaddr);
 extern struct net_device *dev_getfirstbyhwtype(unsigned short type);
+extern struct net_device *__dev_getfirstbyhwtype(unsigned short type);
 extern void             dev_add_pack(struct packet_type *pt);
 extern void             dev_remove_pack(struct packet_type *pt);
 extern void             __dev_remove_pack(struct packet_type *pt);
diff --git a/net/core/dev.c b/net/core/dev.c
index eb999003bbb7..c305819b7266 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -576,17 +576,28 @@ struct net_device *dev_getbyhwaddr(unsigned short type, char *ha)
 
 EXPORT_SYMBOL(dev_getbyhwaddr);
 
-struct net_device *dev_getfirstbyhwtype(unsigned short type)
+struct net_device *__dev_getfirstbyhwtype(unsigned short type)
 {
         struct net_device *dev;
 
-        rtnl_lock();
+        ASSERT_RTNL();
         for (dev = dev_base; dev; dev = dev->next) {
-                if (dev->type == type) {
-                        dev_hold(dev);
+                if (dev->type == type)
                         break;
-                }
         }
+        return dev;
+}
+
+EXPORT_SYMBOL(__dev_getfirstbyhwtype);
+
+struct net_device *dev_getfirstbyhwtype(unsigned short type)
+{
+        struct net_device *dev;
+
+        rtnl_lock();
+        dev = __dev_getfirstbyhwtype(type);
+        if (dev)
+                dev_hold(dev);
         rtnl_unlock();
         return dev;
 }