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Diffstat (limited to 'net/rds/tcp.c')
-rw-r--r--net/rds/tcp.c42
1 files changed, 30 insertions, 12 deletions
diff --git a/net/rds/tcp.c b/net/rds/tcp.c
index 9920d2f84eff..44c4652721af 100644
--- a/net/rds/tcp.c
+++ b/net/rds/tcp.c
@@ -49,6 +49,7 @@ static unsigned int rds_tcp_tc_count;
/* Track rds_tcp_connection structs so they can be cleaned up */
static DEFINE_SPINLOCK(rds_tcp_conn_lock);
static LIST_HEAD(rds_tcp_conn_list);
+static atomic_t rds_tcp_unloading = ATOMIC_INIT(0);
static struct kmem_cache *rds_tcp_conn_slab;
@@ -274,14 +275,13 @@ static int rds_tcp_laddr_check(struct net *net, __be32 addr)
static void rds_tcp_conn_free(void *arg)
{
struct rds_tcp_connection *tc = arg;
- unsigned long flags;
rdsdebug("freeing tc %p\n", tc);
- spin_lock_irqsave(&rds_tcp_conn_lock, flags);
+ spin_lock_bh(&rds_tcp_conn_lock);
if (!tc->t_tcp_node_detached)
list_del(&tc->t_tcp_node);
- spin_unlock_irqrestore(&rds_tcp_conn_lock, flags);
+ spin_unlock_bh(&rds_tcp_conn_lock);
kmem_cache_free(rds_tcp_conn_slab, tc);
}
@@ -296,7 +296,7 @@ static int rds_tcp_conn_alloc(struct rds_connection *conn, gfp_t gfp)
tc = kmem_cache_alloc(rds_tcp_conn_slab, gfp);
if (!tc) {
ret = -ENOMEM;
- break;
+ goto fail;
}
mutex_init(&tc->t_conn_path_lock);
tc->t_sock = NULL;
@@ -306,14 +306,19 @@ static int rds_tcp_conn_alloc(struct rds_connection *conn, gfp_t gfp)
conn->c_path[i].cp_transport_data = tc;
tc->t_cpath = &conn->c_path[i];
+ tc->t_tcp_node_detached = true;
- spin_lock_irq(&rds_tcp_conn_lock);
- tc->t_tcp_node_detached = false;
- list_add_tail(&tc->t_tcp_node, &rds_tcp_conn_list);
- spin_unlock_irq(&rds_tcp_conn_lock);
rdsdebug("rds_conn_path [%d] tc %p\n", i,
conn->c_path[i].cp_transport_data);
}
+ spin_lock_bh(&rds_tcp_conn_lock);
+ for (i = 0; i < RDS_MPATH_WORKERS; i++) {
+ tc = conn->c_path[i].cp_transport_data;
+ tc->t_tcp_node_detached = false;
+ list_add_tail(&tc->t_tcp_node, &rds_tcp_conn_list);
+ }
+ spin_unlock_bh(&rds_tcp_conn_lock);
+fail:
if (ret) {
for (j = 0; j < i; j++)
rds_tcp_conn_free(conn->c_path[j].cp_transport_data);
@@ -332,6 +337,16 @@ static bool list_has_conn(struct list_head *list, struct rds_connection *conn)
return false;
}
+static void rds_tcp_set_unloading(void)
+{
+ atomic_set(&rds_tcp_unloading, 1);
+}
+
+static bool rds_tcp_is_unloading(struct rds_connection *conn)
+{
+ return atomic_read(&rds_tcp_unloading) != 0;
+}
+
static void rds_tcp_destroy_conns(void)
{
struct rds_tcp_connection *tc, *_tc;
@@ -370,6 +385,7 @@ struct rds_transport rds_tcp_transport = {
.t_type = RDS_TRANS_TCP,
.t_prefer_loopback = 1,
.t_mp_capable = 1,
+ .t_unloading = rds_tcp_is_unloading,
};
static unsigned int rds_tcp_netid;
@@ -513,7 +529,7 @@ static void rds_tcp_kill_sock(struct net *net)
rtn->rds_tcp_listen_sock = NULL;
rds_tcp_listen_stop(lsock, &rtn->rds_tcp_accept_w);
- spin_lock_irq(&rds_tcp_conn_lock);
+ spin_lock_bh(&rds_tcp_conn_lock);
list_for_each_entry_safe(tc, _tc, &rds_tcp_conn_list, t_tcp_node) {
struct net *c_net = read_pnet(&tc->t_cpath->cp_conn->c_net);
@@ -526,7 +542,7 @@ static void rds_tcp_kill_sock(struct net *net)
tc->t_tcp_node_detached = true;
}
}
- spin_unlock_irq(&rds_tcp_conn_lock);
+ spin_unlock_bh(&rds_tcp_conn_lock);
list_for_each_entry_safe(tc, _tc, &tmp_list, t_tcp_node)
rds_conn_destroy(tc->t_cpath->cp_conn);
}
@@ -574,7 +590,7 @@ static void rds_tcp_sysctl_reset(struct net *net)
{
struct rds_tcp_connection *tc, *_tc;
- spin_lock_irq(&rds_tcp_conn_lock);
+ spin_lock_bh(&rds_tcp_conn_lock);
list_for_each_entry_safe(tc, _tc, &rds_tcp_conn_list, t_tcp_node) {
struct net *c_net = read_pnet(&tc->t_cpath->cp_conn->c_net);
@@ -584,7 +600,7 @@ static void rds_tcp_sysctl_reset(struct net *net)
/* reconnect with new parameters */
rds_conn_path_drop(tc->t_cpath, false);
}
- spin_unlock_irq(&rds_tcp_conn_lock);
+ spin_unlock_bh(&rds_tcp_conn_lock);
}
static int rds_tcp_skbuf_handler(struct ctl_table *ctl, int write,
@@ -607,6 +623,8 @@ static int rds_tcp_skbuf_handler(struct ctl_table *ctl, int write,
static void rds_tcp_exit(void)
{
+ rds_tcp_set_unloading();
+ synchronize_rcu();
rds_info_deregister_func(RDS_INFO_TCP_SOCKETS, rds_tcp_tc_info);
unregister_pernet_subsys(&rds_tcp_net_ops);
if (unregister_netdevice_notifier(&rds_tcp_dev_notifier))