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authorYing Xue <ying.xue@windriver.com>2014-05-05 08:56:17 +0800
committerDavid S. Miller <davem@davemloft.net>2014-05-05 17:26:45 -0400
commit3f5a12bd9f9a61d8a12f9adf778b14e4bb8ca050 (patch)
tree4fe673edf946c5dbcbd472c04d5d20360d897c2e /net
parenteb8b00f5f248c50603bca383792ac3a618297be0 (diff)
tipc: avoid to asynchronously reset all links
Postpone the actions of resetting all links until after bclink lock is released, avoiding to asynchronously reset all links. Signed-off-by: Ying Xue <ying.xue@windriver.com> Reviewed-by: Erik Hugne <erik.hugne@ericsson.com> Reviewed-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/tipc/bcast.c21
-rw-r--r--net/tipc/bcast.h2
-rw-r--r--net/tipc/link.c22
-rw-r--r--net/tipc/link.h1
4 files changed, 32 insertions, 14 deletions
diff --git a/net/tipc/bcast.c b/net/tipc/bcast.c
index ef8cff4ad743..a0978d0890cb 100644
--- a/net/tipc/bcast.c
+++ b/net/tipc/bcast.c
@@ -87,6 +87,7 @@ struct tipc_bcbearer {
* @lock: spinlock governing access to structure
* @link: (non-standard) broadcast link structure
* @node: (non-standard) node structure representing b'cast link's peer node
+ * @flags: represent bclink states
* @bcast_nodes: map of broadcast-capable nodes
* @retransmit_to: node that most recently requested a retransmit
*
@@ -96,6 +97,7 @@ struct tipc_bclink {
spinlock_t lock;
struct tipc_link link;
struct tipc_node node;
+ unsigned int flags;
struct tipc_node_map bcast_nodes;
struct tipc_node *retransmit_to;
};
@@ -119,7 +121,26 @@ static void tipc_bclink_lock(void)
static void tipc_bclink_unlock(void)
{
+ struct tipc_node *node = NULL;
+
+ if (likely(!bclink->flags)) {
+ spin_unlock_bh(&bclink->lock);
+ return;
+ }
+
+ if (bclink->flags & TIPC_BCLINK_RESET) {
+ bclink->flags &= ~TIPC_BCLINK_RESET;
+ node = tipc_bclink_retransmit_to();
+ }
spin_unlock_bh(&bclink->lock);
+
+ if (node)
+ tipc_link_reset_all(node);
+}
+
+void tipc_bclink_set_flags(unsigned int flags)
+{
+ bclink->flags |= flags;
}
static u32 bcbuf_acks(struct sk_buff *buf)
diff --git a/net/tipc/bcast.h b/net/tipc/bcast.h
index ea162c7b30ee..00330c45df3e 100644
--- a/net/tipc/bcast.h
+++ b/net/tipc/bcast.h
@@ -39,6 +39,7 @@
#define MAX_NODES 4096
#define WSIZE 32
+#define TIPC_BCLINK_RESET 1
/**
* struct tipc_node_map - set of node identifiers
@@ -83,6 +84,7 @@ void tipc_port_list_free(struct tipc_port_list *pl_ptr);
int tipc_bclink_init(void);
void tipc_bclink_stop(void);
+void tipc_bclink_set_flags(unsigned int flags);
void tipc_bclink_add_node(u32 addr);
void tipc_bclink_remove_node(u32 addr);
struct tipc_node *tipc_bclink_retransmit_to(void);
diff --git a/net/tipc/link.c b/net/tipc/link.c
index ac074aaf104d..dce2bef81720 100644
--- a/net/tipc/link.c
+++ b/net/tipc/link.c
@@ -1259,29 +1259,24 @@ void tipc_link_push_queue(struct tipc_link *l_ptr)
} while (!res);
}
-static void link_reset_all(unsigned long addr)
+void tipc_link_reset_all(struct tipc_node *node)
{
- struct tipc_node *n_ptr;
char addr_string[16];
u32 i;
- n_ptr = tipc_node_find((u32)addr);
- if (!n_ptr)
- return; /* node no longer exists */
-
- tipc_node_lock(n_ptr);
+ tipc_node_lock(node);
pr_warn("Resetting all links to %s\n",
- tipc_addr_string_fill(addr_string, n_ptr->addr));
+ tipc_addr_string_fill(addr_string, node->addr));
for (i = 0; i < MAX_BEARERS; i++) {
- if (n_ptr->links[i]) {
- link_print(n_ptr->links[i], "Resetting link\n");
- tipc_link_reset(n_ptr->links[i]);
+ if (node->links[i]) {
+ link_print(node->links[i], "Resetting link\n");
+ tipc_link_reset(node->links[i]);
}
}
- tipc_node_unlock(n_ptr);
+ tipc_node_unlock(node);
}
static void link_retransmit_failure(struct tipc_link *l_ptr,
@@ -1318,10 +1313,9 @@ static void link_retransmit_failure(struct tipc_link *l_ptr,
n_ptr->bclink.oos_state,
n_ptr->bclink.last_sent);
- tipc_k_signal((Handler)link_reset_all, (unsigned long)n_ptr->addr);
-
tipc_node_unlock(n_ptr);
+ tipc_bclink_set_flags(TIPC_BCLINK_RESET);
l_ptr->stale_count = 0;
}
}
diff --git a/net/tipc/link.h b/net/tipc/link.h
index 4b556c181bae..7ba73fa6b81e 100644
--- a/net/tipc/link.h
+++ b/net/tipc/link.h
@@ -230,6 +230,7 @@ struct sk_buff *tipc_link_cmd_show_stats(const void *req_tlv_area,
int req_tlv_space);
struct sk_buff *tipc_link_cmd_reset_stats(const void *req_tlv_area,
int req_tlv_space);
+void tipc_link_reset_all(struct tipc_node *node);
void tipc_link_reset(struct tipc_link *l_ptr);
void tipc_link_reset_list(unsigned int bearer_id);
int tipc_link_xmit(struct sk_buff *buf, u32 dest, u32 selector);