[NET]: Make netdev_chain a raw notifier.

From: Alan Stern <stern@rowland.harvard.edu>

This chain does it's own locking via the RTNL semaphore, and
can also run recursively so adding a new mutex here was causing
deadlocks.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 18 insertions, 18 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index 9ab3cfa58466..ced57430f6d8 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -193,7 +193,7 @@ static inline struct hlist_head *dev_index_hash(int ifindex)
  *      Our notifier list
  */
 
-static BLOCKING_NOTIFIER_HEAD(netdev_chain);
+static RAW_NOTIFIER_HEAD(netdev_chain);
 
 /*
  *      Device drivers call our routines to queue packets here. We empty the
@@ -736,7 +736,7 @@ int dev_change_name(struct net_device *dev, char *newname)
         if (!err) {
                 hlist_del(&dev->name_hlist);
                 hlist_add_head(&dev->name_hlist, dev_name_hash(dev->name));
-                blocking_notifier_call_chain(&netdev_chain,
+                raw_notifier_call_chain(&netdev_chain,
                                 NETDEV_CHANGENAME, dev);
         }
 
@@ -751,7 +751,7 @@ int dev_change_name(struct net_device *dev, char *newname)
  */
 void netdev_features_change(struct net_device *dev)
 {
-        blocking_notifier_call_chain(&netdev_chain, NETDEV_FEAT_CHANGE, dev);
+        raw_notifier_call_chain(&netdev_chain, NETDEV_FEAT_CHANGE, dev);
 }
 EXPORT_SYMBOL(netdev_features_change);
 
@@ -766,7 +766,7 @@ EXPORT_SYMBOL(netdev_features_change);
 void netdev_state_change(struct net_device *dev)
 {
         if (dev->flags & IFF_UP) {
-                blocking_notifier_call_chain(&netdev_chain,
+                raw_notifier_call_chain(&netdev_chain,
                                 NETDEV_CHANGE, dev);
                 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
         }
@@ -864,7 +864,7 @@ int dev_open(struct net_device *dev)
                 /*
                  *      ... and announce new interface.
                  */
-                blocking_notifier_call_chain(&netdev_chain, NETDEV_UP, dev);
+                raw_notifier_call_chain(&netdev_chain, NETDEV_UP, dev);
         }
         return ret;
 }
@@ -887,7 +887,7 @@ int dev_close(struct net_device *dev)
          *      Tell people we are going down, so that they can
          *      prepare to death, when device is still operating.
          */
-        blocking_notifier_call_chain(&netdev_chain, NETDEV_GOING_DOWN, dev);
+        raw_notifier_call_chain(&netdev_chain, NETDEV_GOING_DOWN, dev);
 
         dev_deactivate(dev);
 
@@ -924,7 +924,7 @@ int dev_close(struct net_device *dev)
         /*
          * Tell people we are down
          */
-        blocking_notifier_call_chain(&netdev_chain, NETDEV_DOWN, dev);
+        raw_notifier_call_chain(&netdev_chain, NETDEV_DOWN, dev);
 
         return 0;
 }
@@ -955,7 +955,7 @@ int register_netdevice_notifier(struct notifier_block *nb)
         int err;
 
         rtnl_lock();
-        err = blocking_notifier_chain_register(&netdev_chain, nb);
+        err = raw_notifier_chain_register(&netdev_chain, nb);
         if (!err) {
                 for (dev = dev_base; dev; dev = dev->next) {
                         nb->notifier_call(nb, NETDEV_REGISTER, dev);
@@ -983,7 +983,7 @@ int unregister_netdevice_notifier(struct notifier_block *nb)
         int err;
 
         rtnl_lock();
-        err = blocking_notifier_chain_unregister(&netdev_chain, nb);
+        err = raw_notifier_chain_unregister(&netdev_chain, nb);
         rtnl_unlock();
         return err;
 }
@@ -994,12 +994,12 @@ int unregister_netdevice_notifier(struct notifier_block *nb)
  *      @v:   pointer passed unmodified to notifier function
  *
  *      Call all network notifier blocks.  Parameters and return value
- *      are as for blocking_notifier_call_chain().
+ *      are as for raw_notifier_call_chain().
  */
 
 int call_netdevice_notifiers(unsigned long val, void *v)
 {
-        return blocking_notifier_call_chain(&netdev_chain, val, v);
+        return raw_notifier_call_chain(&netdev_chain, val, v);
 }
 
 /* When > 0 there are consumers of rx skb time stamps */
@@ -2308,7 +2308,7 @@ int dev_change_flags(struct net_device *dev, unsigned flags)
         if (dev->flags & IFF_UP &&
             ((old_flags ^ dev->flags) &~ (IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
                                           IFF_VOLATILE)))
-                blocking_notifier_call_chain(&netdev_chain,
+                raw_notifier_call_chain(&netdev_chain,
                                 NETDEV_CHANGE, dev);
 
         if ((flags ^ dev->gflags) & IFF_PROMISC) {
@@ -2353,7 +2353,7 @@ int dev_set_mtu(struct net_device *dev, int new_mtu)
         else
                 dev->mtu = new_mtu;
         if (!err && dev->flags & IFF_UP)
-                blocking_notifier_call_chain(&netdev_chain,
+                raw_notifier_call_chain(&netdev_chain,
                                 NETDEV_CHANGEMTU, dev);
         return err;
 }
@@ -2370,7 +2370,7 @@ int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
                 return -ENODEV;
         err = dev->set_mac_address(dev, sa);
         if (!err)
-                blocking_notifier_call_chain(&netdev_chain,
+                raw_notifier_call_chain(&netdev_chain,
                                 NETDEV_CHANGEADDR, dev);
         return err;
 }
@@ -2427,7 +2427,7 @@ static int dev_ifsioc(struct ifreq *ifr, unsigned int cmd)
                                 return -EINVAL;
                         memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
                                min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
-                        blocking_notifier_call_chain(&netdev_chain,
+                        raw_notifier_call_chain(&netdev_chain,
                                             NETDEV_CHANGEADDR, dev);
                         return 0;
 
@@ -2882,7 +2882,7 @@ int register_netdevice(struct net_device *dev)
         write_unlock_bh(&dev_base_lock);
 
         /* Notify protocols, that a new device appeared. */
-        blocking_notifier_call_chain(&netdev_chain, NETDEV_REGISTER, dev);
+        raw_notifier_call_chain(&netdev_chain, NETDEV_REGISTER, dev);
 
         /* Finish registration after unlock */
         net_set_todo(dev);
@@ -2961,7 +2961,7 @@ static void netdev_wait_allrefs(struct net_device *dev)
                         rtnl_lock();
 
                         /* Rebroadcast unregister notification */
-                        blocking_notifier_call_chain(&netdev_chain,
+                        raw_notifier_call_chain(&netdev_chain,
                                             NETDEV_UNREGISTER, dev);
 
                         if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
@@ -3216,7 +3216,7 @@ int unregister_netdevice(struct net_device *dev)
         /* Notify protocols, that we are about to destroy
            this device. They should clean all the things.
         */
-        blocking_notifier_call_chain(&netdev_chain, NETDEV_UNREGISTER, dev);
+        raw_notifier_call_chain(&netdev_chain, NETDEV_UNREGISTER, dev);
         
         /*
          *      Flush the multicast chain