batman-adv/patches/0001-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 --- a/net/batman-adv/multicast.c
   9 +++ b/net/batman-adv/multicast.c
  10 @@ -431,9 +431,14 @@ batadv_mcast_mla_softif_get_ipv6(struct
  11                 return 0;
  12         }
  13
  14 +#if LINUX_VERSION_IS_LESS(5, 13, 0)
  15 +       read_lock_bh(&in6_dev->lock);
  16 +       for (pmc6 = in6_dev->mc_list; pmc6; pmc6 = pmc6->next) {
  17 +#else
  18         for (pmc6 = rcu_dereference(in6_dev->mc_list);
  19              pmc6;
  20              pmc6 = rcu_dereference(pmc6->next)) {
  21 +#endif
  22                 if (IPV6_ADDR_MC_SCOPE(&pmc6->mca_addr) <
  23                     IPV6_ADDR_SCOPE_LINKLOCAL)
  24                         continue;
  25 @@ -462,6 +467,9 @@ batadv_mcast_mla_softif_get_ipv6(struct
  26                 hlist_add_head(&new->list, mcast_list);
  27                 ret++;
  28         }
  29 +#if LINUX_VERSION_IS_LESS(5, 13, 0)
  30 +       read_unlock_bh(&in6_dev->lock);
  31 +#endif
  32         rcu_read_unlock();
  33
  34         return ret;