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Diffstat (limited to 'net/rds/bind.c')
-rw-r--r--net/rds/bind.c35
1 files changed, 15 insertions, 20 deletions
diff --git a/net/rds/bind.c b/net/rds/bind.c
index dd666fb9b4e1..01989e2104bd 100644
--- a/net/rds/bind.c
+++ b/net/rds/bind.c
@@ -40,7 +40,7 @@
#define BIND_HASH_SIZE 1024
static struct hlist_head bind_hash_table[BIND_HASH_SIZE];
-static DEFINE_SPINLOCK(rds_bind_lock);
+static DEFINE_RWLOCK(rds_bind_lock);
static struct hlist_head *hash_to_bucket(__be32 addr, __be16 port)
{
@@ -48,6 +48,7 @@ static struct hlist_head *hash_to_bucket(__be32 addr, __be16 port)
(BIND_HASH_SIZE - 1));
}
+/* must hold either read or write lock (write lock for insert != NULL) */
static struct rds_sock *rds_bind_lookup(__be32 addr, __be16 port,
struct rds_sock *insert)
{
@@ -56,30 +57,24 @@ static struct rds_sock *rds_bind_lookup(__be32 addr, __be16 port,
u64 cmp;
u64 needle = ((u64)be32_to_cpu(addr) << 32) | be16_to_cpu(port);
- rcu_read_lock();
- hlist_for_each_entry_rcu(rs, head, rs_bound_node) {
+ hlist_for_each_entry(rs, head, rs_bound_node) {
cmp = ((u64)be32_to_cpu(rs->rs_bound_addr) << 32) |
be16_to_cpu(rs->rs_bound_port);
- if (cmp == needle) {
- rcu_read_unlock();
+ if (cmp == needle)
return rs;
- }
}
- rcu_read_unlock();
if (insert) {
/*
* make sure our addr and port are set before
- * we are added to the list, other people
- * in rcu will find us as soon as the
- * hlist_add_head_rcu is done
+ * we are added to the list.
*/
insert->rs_bound_addr = addr;
insert->rs_bound_port = port;
rds_sock_addref(insert);
- hlist_add_head_rcu(&insert->rs_bound_node, head);
+ hlist_add_head(&insert->rs_bound_node, head);
}
return NULL;
}
@@ -93,8 +88,11 @@ static struct rds_sock *rds_bind_lookup(__be32 addr, __be16 port,
struct rds_sock *rds_find_bound(__be32 addr, __be16 port)
{
struct rds_sock *rs;
+ unsigned long flags;
+ read_lock_irqsave(&rds_bind_lock, flags);
rs = rds_bind_lookup(addr, port, NULL);
+ read_unlock_irqrestore(&rds_bind_lock, flags);
if (rs && !sock_flag(rds_rs_to_sk(rs), SOCK_DEAD))
rds_sock_addref(rs);
@@ -103,6 +101,7 @@ struct rds_sock *rds_find_bound(__be32 addr, __be16 port)
rdsdebug("returning rs %p for %pI4:%u\n", rs, &addr,
ntohs(port));
+
return rs;
}
@@ -121,7 +120,7 @@ static int rds_add_bound(struct rds_sock *rs, __be32 addr, __be16 *port)
last = rover - 1;
}
- spin_lock_irqsave(&rds_bind_lock, flags);
+ write_lock_irqsave(&rds_bind_lock, flags);
do {
if (rover == 0)
@@ -135,7 +134,7 @@ static int rds_add_bound(struct rds_sock *rs, __be32 addr, __be16 *port)
}
} while (rover++ != last);
- spin_unlock_irqrestore(&rds_bind_lock, flags);
+ write_unlock_irqrestore(&rds_bind_lock, flags);
return ret;
}
@@ -144,19 +143,19 @@ void rds_remove_bound(struct rds_sock *rs)
{
unsigned long flags;
- spin_lock_irqsave(&rds_bind_lock, flags);
+ write_lock_irqsave(&rds_bind_lock, flags);
if (rs->rs_bound_addr) {
rdsdebug("rs %p unbinding from %pI4:%d\n",
rs, &rs->rs_bound_addr,
ntohs(rs->rs_bound_port));
- hlist_del_init_rcu(&rs->rs_bound_node);
+ hlist_del_init(&rs->rs_bound_node);
rds_sock_put(rs);
rs->rs_bound_addr = 0;
}
- spin_unlock_irqrestore(&rds_bind_lock, flags);
+ write_unlock_irqrestore(&rds_bind_lock, flags);
}
int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
@@ -200,9 +199,5 @@ int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
out:
release_sock(sk);
-
- /* we might have called rds_remove_bound on error */
- if (ret)
- synchronize_rcu();
return ret;
}