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| author | Taehee Yoo <ap420073@gmail.com> | 2021-03-25 16:16:55 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-03-26 15:14:56 -0700 |
| commit | 88e2ca3080947fe22eb520c1f8231e79a105d011 (patch) | |
| tree | 546cc57e9db1e1f5c09b951694a4213d1d725515 /net/batman-adv/multicast.c | |
| parent | 4b200e398953c237c86d32bf26d4cb2a96556a6f (diff) | |
| download | linux-88e2ca3080947fe22eb520c1f8231e79a105d011.tar.gz | |
mld: convert ifmcaddr6 to RCU
The ifmcaddr6 has been protected by inet6_dev->lock(rwlock) so that the critical section is atomic context. In order to switch this context, changing locking is needed. The ifmcaddr6 actually already protected by RTNL So if it's converted to use RCU, its control path context can be switched to sleepable. Suggested-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: Taehee Yoo <ap420073@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/batman-adv/multicast.c')
| -rw-r--r-- | net/batman-adv/multicast.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/net/batman-adv/multicast.c b/net/batman-adv/multicast.c index 28166402d30c..1d63c8cbbfe7 100644 --- a/net/batman-adv/multicast.c +++ b/net/batman-adv/multicast.c @@ -454,8 +454,9 @@ batadv_mcast_mla_softif_get_ipv6(struct net_device *dev, return 0; } - read_lock_bh(&in6_dev->lock); - for (pmc6 = in6_dev->mc_list; pmc6; pmc6 = pmc6->next) { + for (pmc6 = rcu_dereference(in6_dev->mc_list); + pmc6; + pmc6 = rcu_dereference(pmc6->next)) { if (IPV6_ADDR_MC_SCOPE(&pmc6->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) continue; @@ -484,7 +485,6 @@ batadv_mcast_mla_softif_get_ipv6(struct net_device *dev, hlist_add_head(&new->list, mcast_list); ret++; } - read_unlock_bh(&in6_dev->lock); rcu_read_unlock(); return ret; |