src/patches/suse-2.6.27.39/patches.fixes/bridge-module-get-put.patch

   1 From: jbeulich@novell.com
   2 Subject: Module use count must be updated as bridges are created/destroyed
   3 Patch-mainline: unknown
   4 References: 267651
   5
   6 Otherwise 'modprobe -r' on a module having a dependency on bridge will
   7 implicitly unload bridge, bringing down all connectivity that was using
   8 bridges.
   9
  10 ---
  11  net/bridge/br_if.c |    9 +++++++++
  12  1 file changed, 9 insertions(+)
  13
  14 --- a/net/bridge/br_if.c
  15 +++ b/net/bridge/br_if.c
  16 @@ -271,6 +271,11 @@ int br_add_bridge(const char *name)
  17         if (!dev)
  18                 return -ENOMEM;
  19
  20 +       if (!try_module_get(THIS_MODULE)) {
  21 +               free_netdev(dev);
  22 +               return -ENOENT;
  23 +       }
  24 +
  25         rtnl_lock();
  26         if (strchr(dev->name, '%')) {
  27                 ret = dev_alloc_name(dev, dev->name);
  28 @@ -287,6 +292,8 @@ int br_add_bridge(const char *name)
  29                 unregister_netdevice(dev);
  30   out:
  31         rtnl_unlock();
  32 +       if (ret)
  33 +               module_put(THIS_MODULE);
  34         return ret;
  35
  36  out_free:
  37 @@ -318,6 +325,8 @@ int br_del_bridge(const char *name)
  38                 del_br(netdev_priv(dev));
  39
  40         rtnl_unlock();
  41 +       if (ret == 0)
  42 +               module_put(THIS_MODULE);
  43         return ret;
  44  }
  45