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OpenCloudOS-Kernel
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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>
This commit is contained in:
stephen hemminger 2009-11-10 07:54:55 +00:00 committed by David S. Miller
parent fa918602b6
commit 61fbab77a8
1 changed files with 10 additions and 8 deletions
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18
net/ipv4/igmp.c
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@ -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)