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authorAllan Stephens <allan.stephens@windriver.com>2008-07-14 22:44:58 -0700
committerDavid S. Miller <davem@davemloft.net>2008-07-14 22:44:58 -0700
commit1aad72d6cd518872c5f545320823bf7f4dafb026 (patch)
treeae5e1f5e0fbd5bed8ed75ddf6184d4f7ec71354f /net/tipc
parent08d2cf0f74b3ee5e773bb906043a0efe96ded229 (diff)
downloadlinux-2.6.34-ux500-1aad72d6cd518872c5f545320823bf7f4dafb026.tar.gz
tipc: Add missing locks when inspecting node list & link list
This patch ensures that TIPC configuration commands that display info about neighboring nodes and their links take the spinlocks that protect the node list and link lists from changing while the lists are being traversed. Signed-off-by: Allan Stephens <allan.stephens@windriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/tipc')
-rw-r--r--net/tipc/node.c29
1 files changed, 24 insertions, 5 deletions
diff --git a/net/tipc/node.c b/net/tipc/node.c
index 34e9a2bb7c1..ee952ad6021 100644
--- a/net/tipc/node.c
+++ b/net/tipc/node.c
@@ -600,12 +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;
}
@@ -625,19 +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 */
@@ -650,6 +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;
}
@@ -672,16 +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 */
@@ -697,6 +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;
@@ -706,7 +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;
}