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authorEric Dumazet <edumazet@google.com>2016-07-08 05:46:04 +0200
committerDavid S. Miller <davem@davemloft.net>2016-07-09 18:13:20 -0400
commit927265bc6cd6374c9bafc43408ece4e92311b149 (patch)
tree0d10190f17eea768f23c480f56c46e0166d335a1 /net/ipv6/ip6mr.c
parentfa17806cde76fb1087532f07e72aa757a30e0500 (diff)
downloadlinux-927265bc6cd6374c9bafc43408ece4e92311b149.tar.bz2
ipv6: do not abuse GFP_ATOMIC in inet6_netconf_notify_devconf()
All inet6_netconf_notify_devconf() callers are in process context, so we can use GFP_KERNEL allocations if we take care of not holding a rwlock while not needed in ip6mr (we hold RTNL there) Fixes: d67b8c616b48 ("netconf: advertise mc_forwarding status") Fixes: f3a1bfb11ccb ("rtnl/ipv6: use netconf msg to advertise forwarding status") Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Nicolas Dichtel <nicolas.dichtel@6wind.com> Acked-by: Nicolas Dichtel <nicolas.dichtel@6wind.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/ip6mr.c')
-rw-r--r--net/ipv6/ip6mr.c13
1 files changed, 7 insertions, 6 deletions
diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
index 487ef3bc7bbc..c7ca0f5d1a3b 100644
--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -1592,14 +1592,15 @@ static int ip6mr_sk_init(struct mr6_table *mrt, struct sock *sk)
if (likely(mrt->mroute6_sk == NULL)) {
mrt->mroute6_sk = sk;
net->ipv6.devconf_all->mc_forwarding++;
- inet6_netconf_notify_devconf(net, NETCONFA_MC_FORWARDING,
- NETCONFA_IFINDEX_ALL,
- net->ipv6.devconf_all);
- }
- else
+ } else {
err = -EADDRINUSE;
+ }
write_unlock_bh(&mrt_lock);
+ if (!err)
+ inet6_netconf_notify_devconf(net, NETCONFA_MC_FORWARDING,
+ NETCONFA_IFINDEX_ALL,
+ net->ipv6.devconf_all);
rtnl_unlock();
return err;
@@ -1617,11 +1618,11 @@ int ip6mr_sk_done(struct sock *sk)
write_lock_bh(&mrt_lock);
mrt->mroute6_sk = NULL;
net->ipv6.devconf_all->mc_forwarding--;
+ write_unlock_bh(&mrt_lock);
inet6_netconf_notify_devconf(net,
NETCONFA_MC_FORWARDING,
NETCONFA_IFINDEX_ALL,
net->ipv6.devconf_all);
- write_unlock_bh(&mrt_lock);
mroute_clean_tables(mrt, false);
err = 0;