[NET]: Rework dev_base via list_head (v3)

Cleanup of dev_base list use, with the aim to simplify making device
list per-namespace. In almost every occasion, use of dev_base variable
and dev->next pointer could be easily replaced by for_each_netdev
loop. A few most complicated places were converted to using
first_netdev()/next_netdev().

Signed-off-by: Pavel Emelianov <xemul@openvz.org>
Acked-by: Kirill Korotaev <dev@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 8 deletions

diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c
index 6c2758951d60..3e308fb41b49 100644
--- a/net/ipv6/mcast.c
+++ b/net/ipv6/mcast.c
@@ -2331,9 +2331,8 @@ static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
         struct ifmcaddr6 *im = NULL;
         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
 
-        for (state->dev = dev_base, state->idev = NULL;
-             state->dev;
-             state->dev = state->dev->next) {
+        state->idev = NULL;
+        for_each_netdev(state->dev) {
                 struct inet6_dev *idev;
                 idev = in6_dev_get(state->dev);
                 if (!idev)
@@ -2360,7 +2359,7 @@ static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr
                         read_unlock_bh(&state->idev->lock);
                         in6_dev_put(state->idev);
                 }
-                state->dev = state->dev->next;
+                state->dev = next_net_device(state->dev);
                 if (!state->dev) {
                         state->idev = NULL;
                         break;
@@ -2475,9 +2474,9 @@ static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
         struct ifmcaddr6 *im = NULL;
         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
 
-        for (state->dev = dev_base, state->idev = NULL, state->im = NULL;
-             state->dev;
-             state->dev = state->dev->next) {
+        state->idev = NULL;
+        state->im = NULL;
+        for_each_netdev(state->dev) {
                 struct inet6_dev *idev;
                 idev = in6_dev_get(state->dev);
                 if (unlikely(idev == NULL))
@@ -2513,7 +2512,7 @@ static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_s
                                 read_unlock_bh(&state->idev->lock);
                                 in6_dev_put(state->idev);
                         }
-                        state->dev = state->dev->next;
+                        state->dev = next_net_device(state->dev);
                         if (!state->dev) {
                                 state->idev = NULL;
                                 goto out;