batman-adv/patches/0003-batman-adv-Fix-build-of-multicast-code-against-Linux.patch

   1 From: Sven Eckelmann <sven@narfation.org>
   2 Date: Fri, 14 May 2021 19:34:35 +0200
   3 Subject: batman-adv: Fix build of multicast code against Linux < 5.13
   4
   5 Fixes: 007b4c4b031f ("batman-adv: convert ifmcaddr6 to RCU")
   6 Signed-off-by: Sven Eckelmann <sven@narfation.org>
   7
   8 diff --git a/net/batman-adv/multicast.c b/net/batman-adv/multicast.c
   9 index 1d63c8cbbfe7b16e360e91bcf3bb77ec7b12893b..ece9fb5dd81bfadbdbe15363dfd8fd257dbe942f 100644
  10 --- a/net/batman-adv/multicast.c
  11 +++ b/net/batman-adv/multicast.c
  12 @@ -454,9 +454,14 @@ batadv_mcast_mla_softif_get_ipv6(struct net_device *dev,
  13                 return 0;
  14         }
  15
  16 +#if LINUX_VERSION_IS_LESS(5, 13, 0)
  17 +       read_lock_bh(&in6_dev->lock);
  18 +       for (pmc6 = in6_dev->mc_list; pmc6; pmc6 = pmc6->next) {
  19 +#else
  20         for (pmc6 = rcu_dereference(in6_dev->mc_list);
  21              pmc6;
  22              pmc6 = rcu_dereference(pmc6->next)) {
  23 +#endif
  24                 if (IPV6_ADDR_MC_SCOPE(&pmc6->mca_addr) <
  25                     IPV6_ADDR_SCOPE_LINKLOCAL)
  26                         continue;
  27 @@ -485,6 +490,9 @@ batadv_mcast_mla_softif_get_ipv6(struct net_device *dev,
  28                 hlist_add_head(&new->list, mcast_list);
  29                 ret++;
  30         }
  31 +#if LINUX_VERSION_IS_LESS(5, 13, 0)
  32 +       read_unlock_bh(&in6_dev->lock);
  33 +#endif
  34         rcu_read_unlock();
  35
  36         return ret;