From 61fbab77a843d2e772322ac130715cc9a98bf718 Mon Sep 17 00:00:00 2001
From: stephen hemminger <shemminger@vyatta.com>
Date: Tue, 10 Nov 2009 07:54:55 +0000
Subject: [PATCH] IPV4: use rcu to walk list of devices in IGMP
This also needs to be optimized for large number of devices.
Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
net/ipv4/igmp.c | 18 ++++++++++--------
1 file changed, 10 insertions(+), 8 deletions(-)
diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
index d41e5de79a82..bd24f6560a49 100644
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -2311,7 +2311,7 @@ static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
state->in_dev = NULL;
- for_each_netdev(net, state->dev) {
+ for_each_netdev_rcu(net, state->dev) {
struct in_device *in_dev;
in_dev = in_dev_get(state->dev);
if (!in_dev)
@@ -2361,9 +2361,9 @@ static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
}
static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
- __acquires(dev_base_lock)
+ __acquires(rcu)
{
- read_lock(&dev_base_lock);
+ rcu_read_lock();
return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
}
@@ -2379,7 +2379,7 @@ static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
}
static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
- __releases(dev_base_lock)
+ __releases(rcu)
{
struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
if (likely(state->in_dev != NULL)) {
@@ -2388,7 +2388,7 @@ static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
state->in_dev = NULL;
}
state->dev = NULL;
- read_unlock(&dev_base_lock);
+ rcu_read_unlock();
}
static int igmp_mc_seq_show(struct seq_file *seq, void *v)
@@ -2462,7 +2462,7 @@ static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
state->idev = NULL;
state->im = NULL;
- for_each_netdev(net, state->dev) {
+ for_each_netdev_rcu(net, state->dev) {
struct in_device *idev;
idev = in_dev_get(state->dev);
if (unlikely(idev == NULL))
@@ -2528,8 +2528,9 @@ static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
}
static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
+ __acquires(rcu)
{
- read_lock(&dev_base_lock);
+ rcu_read_lock();
return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
}
@@ -2545,6 +2546,7 @@ static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
}
static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
+ __releases(rcu)
{
struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
if (likely(state->im != NULL)) {
@@ -2557,7 +2559,7 @@ static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
state->idev = NULL;
}
state->dev = NULL;
- read_unlock(&dev_base_lock);
+ rcu_read_unlock();
}
static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
--
GitLab