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authorRémi Denis-Courmont <remi.denis-courmont@nokia.com>2009-11-13 05:01:19 +0000
committerDavid S. Miller <davem@davemloft.net>2009-11-13 20:47:02 -0800
commit888801357f240daee5d310327867d834bc05183b (patch)
tree80ac945f3dfac07f6f8368f5a024511814b8d1e0 /net/phonet
parent7ed0132f232b11ae58b6d868e8d7ada9dfa066d7 (diff)
Phonet: convert routing table to RCU
Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@nokia.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/phonet')
-rw-r--r--net/phonet/pn_dev.c59
1 files changed, 34 insertions, 25 deletions
diff --git a/net/phonet/pn_dev.c b/net/phonet/pn_dev.c
index 6d64fda1afc9..3287f8f0b5cc 100644
--- a/net/phonet/pn_dev.c
+++ b/net/phonet/pn_dev.c
@@ -34,7 +34,7 @@
#include <net/phonet/pn_dev.h>
struct phonet_routes {
- spinlock_t lock;
+ struct mutex lock;
struct net_device *table[64];
};
@@ -248,17 +248,22 @@ static void phonet_route_autodel(struct net_device *dev)
/* Remove left-over Phonet routes */
bitmap_zero(deleted, 64);
- spin_lock_bh(&pnn->routes.lock);
+ mutex_lock(&pnn->routes.lock);
for (i = 0; i < 64; i++)
if (dev == pnn->routes.table[i]) {
+ rcu_assign_pointer(pnn->routes.table[i], NULL);
set_bit(i, deleted);
- pnn->routes.table[i] = NULL;
- dev_put(dev);
}
- spin_unlock_bh(&pnn->routes.lock);
+ mutex_unlock(&pnn->routes.lock);
+
+ if (bitmap_empty(deleted, 64))
+ return; /* short-circuit RCU */
+ synchronize_rcu();
for (i = find_first_bit(deleted, 64); i < 64;
- i = find_next_bit(deleted, 64, i + 1))
+ i = find_next_bit(deleted, 64, i + 1)) {
rtm_phonet_notify(RTM_DELROUTE, dev, i);
+ dev_put(dev);
+ }
}
/* notify Phonet of device events */
@@ -300,7 +305,7 @@ static int phonet_init_net(struct net *net)
INIT_LIST_HEAD(&pnn->pndevs.list);
spin_lock_init(&pnn->pndevs.lock);
- spin_lock_init(&pnn->routes.lock);
+ mutex_init(&pnn->routes.lock);
net_assign_generic(net, phonet_net_id, pnn);
return 0;
}
@@ -361,13 +366,13 @@ int phonet_route_add(struct net_device *dev, u8 daddr)
int err = -EEXIST;
daddr = daddr >> 2;
- spin_lock_bh(&routes->lock);
+ mutex_lock(&routes->lock);
if (routes->table[daddr] == NULL) {
- routes->table[daddr] = dev;
+ rcu_assign_pointer(routes->table[daddr], dev);
dev_hold(dev);
err = 0;
}
- spin_unlock_bh(&routes->lock);
+ mutex_unlock(&routes->lock);
return err;
}
@@ -375,17 +380,20 @@ int phonet_route_del(struct net_device *dev, u8 daddr)
{
struct phonet_net *pnn = net_generic(dev_net(dev), phonet_net_id);
struct phonet_routes *routes = &pnn->routes;
- int err = -ENOENT;
daddr = daddr >> 2;
- spin_lock_bh(&routes->lock);
- if (dev == routes->table[daddr]) {
- routes->table[daddr] = NULL;
- dev_put(dev);
- err = 0;
- }
- spin_unlock_bh(&routes->lock);
- return err;
+ mutex_lock(&routes->lock);
+ if (dev == routes->table[daddr])
+ rcu_assign_pointer(routes->table[daddr], NULL);
+ else
+ dev = NULL;
+ mutex_unlock(&routes->lock);
+
+ if (!dev)
+ return -ENOENT;
+ synchronize_rcu();
+ dev_put(dev);
+ return 0;
}
struct net_device *phonet_route_get(struct net *net, u8 daddr)
@@ -397,9 +405,9 @@ struct net_device *phonet_route_get(struct net *net, u8 daddr)
ASSERT_RTNL(); /* no need to hold the device */
daddr >>= 2;
- spin_lock_bh(&routes->lock);
- dev = routes->table[daddr];
- spin_unlock_bh(&routes->lock);
+ rcu_read_lock();
+ dev = rcu_dereference(routes->table[daddr]);
+ rcu_read_unlock();
return dev;
}
@@ -409,11 +417,12 @@ struct net_device *phonet_route_output(struct net *net, u8 daddr)
struct phonet_routes *routes = &pnn->routes;
struct net_device *dev;
- spin_lock_bh(&routes->lock);
- dev = routes->table[daddr >> 2];
+ daddr >>= 2;
+ rcu_read_lock();
+ dev = rcu_dereference(routes->table[daddr]);
if (dev)
dev_hold(dev);
- spin_unlock_bh(&routes->lock);
+ rcu_read_unlock();
if (!dev)
dev = phonet_device_get(net); /* Default route */

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