Phonet: generate Netlink RTM_DELADDR when destroying a device

Netlink address deletion events were not sent when a network device
vanished neither when Phonet was unloaded.

Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 31 insertions, 21 deletions

diff --git a/net/phonet/pn_dev.c b/net/phonet/pn_dev.c
index 80a322d77909..b0d6ddd82a9d 100644
--- a/net/phonet/pn_dev.c
+++ b/net/phonet/pn_dev.c
@@ -69,10 +69,27 @@ static struct phonet_device *__phonet_get(struct net_device *dev)
         return NULL;
 }
 
-static void __phonet_device_free(struct phonet_device *pnd)
+static void phonet_device_destroy(struct net_device *dev)
 {
-        list_del(&pnd->list);
-        kfree(pnd);
+        struct phonet_device_list *pndevs = phonet_device_list(dev_net(dev));
+        struct phonet_device *pnd;
+
+        ASSERT_RTNL();
+
+        spin_lock_bh(&pndevs->lock);
+        pnd = __phonet_get(dev);
+        if (pnd)
+                list_del(&pnd->list);
+        spin_unlock_bh(&pndevs->lock);
+
+        if (pnd) {
+                u8 addr;
+
+                for (addr = find_first_bit(pnd->addrs, 64); addr < 64;
+                        addr = find_next_bit(pnd->addrs, 64, 1+addr))
+                        phonet_address_notify(RTM_DELADDR, dev, addr);
+                kfree(pnd);
+        }
 }
 
 struct net_device *phonet_device_get(struct net *net)
@@ -126,8 +143,10 @@ int phonet_address_del(struct net_device *dev, u8 addr)
         pnd = __phonet_get(dev);
         if (!pnd || !test_and_clear_bit(addr >> 2, pnd->addrs))
                 err = -EADDRNOTAVAIL;
-        else if (bitmap_empty(pnd->addrs, 64))
-                __phonet_device_free(pnd);
+        else if (bitmap_empty(pnd->addrs, 64)) {
+                list_del(&pnd->list);
+                kfree(pnd);
+        }
         spin_unlock_bh(&pndevs->lock);
         return err;
 }
@@ -181,18 +200,8 @@ static int phonet_device_notify(struct notifier_block *me, unsigned long what,
 {
         struct net_device *dev = arg;
 
-        if (what == NETDEV_UNREGISTER) {
-                struct phonet_device_list *pndevs;
-                struct phonet_device *pnd;
-
-                /* Destroy phonet-specific device data */
-                pndevs = phonet_device_list(dev_net(dev));
-                spin_lock_bh(&pndevs->lock);
-                pnd = __phonet_get(dev);
-                if (pnd)
-                        __phonet_device_free(pnd);
-                spin_unlock_bh(&pndevs->lock);
-        }
+        if (what == NETDEV_UNREGISTER)
+                phonet_device_destroy(dev);
         return 0;
 
 }
@@ -218,11 +227,12 @@ static int phonet_init_net(struct net *net)
 static void phonet_exit_net(struct net *net)
 {
         struct phonet_net *pnn = net_generic(net, phonet_net_id);
-        struct phonet_device *pnd, *n;
-
-        list_for_each_entry_safe(pnd, n, &pnn->pndevs.list, list)
-                __phonet_device_free(pnd);
+        struct net_device *dev;
 
+        rtnl_lock();
+        for_each_netdev(net, dev)
+                phonet_device_destroy(dev);
+        rtnl_unlock();
         kfree(pnn);
 }