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-rw-r--r--net/tipc/node.c55
1 files changed, 50 insertions, 5 deletions
diff --git a/net/tipc/node.c b/net/tipc/node.c
index 598f4d3a009..ee952ad6021 100644
--- a/net/tipc/node.c
+++ b/net/tipc/node.c
@@ -52,16 +52,40 @@ static void node_established_contact(struct node *n_ptr);
struct node *tipc_nodes = NULL; /* sorted list of nodes within cluster */
+static DEFINE_SPINLOCK(node_create_lock);
+
u32 tipc_own_tag = 0;
+/**
+ * tipc_node_create - create neighboring node
+ *
+ * Currently, this routine is called by neighbor discovery code, which holds
+ * net_lock for reading only. We must take node_create_lock to ensure a node
+ * isn't created twice if two different bearers discover the node at the same
+ * time. (It would be preferable to switch to holding net_lock in write mode,
+ * but this is a non-trivial change.)
+ */
+
struct node *tipc_node_create(u32 addr)
{
struct cluster *c_ptr;
struct node *n_ptr;
struct node **curr_node;
+ spin_lock_bh(&node_create_lock);
+
+ for (n_ptr = tipc_nodes; n_ptr; n_ptr = n_ptr->next) {
+ if (addr < n_ptr->addr)
+ break;
+ if (addr == n_ptr->addr) {
+ spin_unlock_bh(&node_create_lock);
+ return n_ptr;
+ }
+ }
+
n_ptr = kzalloc(sizeof(*n_ptr),GFP_ATOMIC);
if (!n_ptr) {
+ spin_unlock_bh(&node_create_lock);
warn("Node creation failed, no memory\n");
return NULL;
}
@@ -71,6 +95,7 @@ struct node *tipc_node_create(u32 addr)
c_ptr = tipc_cltr_create(addr);
}
if (!c_ptr) {
+ spin_unlock_bh(&node_create_lock);
kfree(n_ptr);
return NULL;
}
@@ -91,6 +116,7 @@ struct node *tipc_node_create(u32 addr)
}
}
(*curr_node) = n_ptr;
+ spin_unlock_bh(&node_create_lock);
return n_ptr;
}
@@ -574,12 +600,14 @@ u32 tipc_available_nodes(const u32 domain)
struct node *n_ptr;
u32 cnt = 0;
+ read_lock_bh(&tipc_net_lock);
for (n_ptr = tipc_nodes; n_ptr; n_ptr = n_ptr->next) {
if (!in_scope(domain, n_ptr->addr))
continue;
if (tipc_node_is_up(n_ptr))
cnt++;
}
+ read_unlock_bh(&tipc_net_lock);
return cnt;
}
@@ -599,19 +627,26 @@ struct sk_buff *tipc_node_get_nodes(const void *req_tlv_area, int req_tlv_space)
return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
" (network address)");
- if (!tipc_nodes)
+ read_lock_bh(&tipc_net_lock);
+ if (!tipc_nodes) {
+ read_unlock_bh(&tipc_net_lock);
return tipc_cfg_reply_none();
+ }
/* For now, get space for all other nodes
(will need to modify this when slave nodes are supported */
payload_size = TLV_SPACE(sizeof(node_info)) * (tipc_max_nodes - 1);
- if (payload_size > 32768u)
+ if (payload_size > 32768u) {
+ read_unlock_bh(&tipc_net_lock);
return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
" (too many nodes)");
+ }
buf = tipc_cfg_reply_alloc(payload_size);
- if (!buf)
+ if (!buf) {
+ read_unlock_bh(&tipc_net_lock);
return NULL;
+ }
/* Add TLVs for all nodes in scope */
@@ -624,6 +659,7 @@ struct sk_buff *tipc_node_get_nodes(const void *req_tlv_area, int req_tlv_space)
&node_info, sizeof(node_info));
}
+ read_unlock_bh(&tipc_net_lock);
return buf;
}
@@ -646,16 +682,22 @@ struct sk_buff *tipc_node_get_links(const void *req_tlv_area, int req_tlv_space)
if (tipc_mode != TIPC_NET_MODE)
return tipc_cfg_reply_none();
+ read_lock_bh(&tipc_net_lock);
+
/* Get space for all unicast links + multicast link */
payload_size = TLV_SPACE(sizeof(link_info)) *
(tipc_net.zones[tipc_zone(tipc_own_addr)]->links + 1);
- if (payload_size > 32768u)
+ if (payload_size > 32768u) {
+ read_unlock_bh(&tipc_net_lock);
return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
" (too many links)");
+ }
buf = tipc_cfg_reply_alloc(payload_size);
- if (!buf)
+ if (!buf) {
+ read_unlock_bh(&tipc_net_lock);
return NULL;
+ }
/* Add TLV for broadcast link */
@@ -671,6 +713,7 @@ struct sk_buff *tipc_node_get_links(const void *req_tlv_area, int req_tlv_space)
if (!in_scope(domain, n_ptr->addr))
continue;
+ tipc_node_lock(n_ptr);
for (i = 0; i < MAX_BEARERS; i++) {
if (!n_ptr->links[i])
continue;
@@ -680,7 +723,9 @@ struct sk_buff *tipc_node_get_links(const void *req_tlv_area, int req_tlv_space)
tipc_cfg_append_tlv(buf, TIPC_TLV_LINK_INFO,
&link_info, sizeof(link_info));
}
+ tipc_node_unlock(n_ptr);
}
+ read_unlock_bh(&tipc_net_lock);
return buf;
}