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authorYing Xue <ying.xue@windriver.com>2014-04-21 10:55:42 +0800
committerDavid S. Miller <davem@davemloft.net>2014-04-22 21:17:52 -0400
commitef13a262c339544a81e3ba8d15ee345641593da4 (patch)
tree52b94dff9309959456d0b52136b8cab94cd6e519
parent5a9d19ab76f98b7cdc97ba9724be01deba791bc0 (diff)
downloadop-kernel-dev-ef13a262c339544a81e3ba8d15ee345641593da4.zip
op-kernel-dev-ef13a262c339544a81e3ba8d15ee345641593da4.tar.gz
tipc: replace config_mutex lock with RTNL lock
There have two paths where we can configure or change bearer status: one is that bearer is configured from user space with tipc-config tool; another one is that bearer is changed by notification events from its attached interface. On the first path, one dedicated config_mutex lock is guarded; on the latter path, RTNL lock has been placed to serialize the process of dealing with interface events. So, if RTNL lock is also used to protect the first path, this will not only extremely help us simplify current locking policy, but also config_mutex lock can be deleted as well. Signed-off-by: Ying Xue <ying.xue@windriver.com> Reviewed-by: Jon Maloy <jon.maloy@ericsson.com> Reviewed-by: Erik Hugne <erik.hugne@ericsson.com> Tested-by: Erik Hugne <erik.hugne@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/tipc/config.c6
-rw-r--r--net/tipc/core.h2
2 files changed, 3 insertions, 5 deletions
diff --git a/net/tipc/config.c b/net/tipc/config.c
index 4b981c0..251f5a2 100644
--- a/net/tipc/config.c
+++ b/net/tipc/config.c
@@ -42,8 +42,6 @@
#define REPLY_TRUNCATED "<truncated>\n"
-static DEFINE_MUTEX(config_mutex);
-
static const void *req_tlv_area; /* request message TLV area */
static int req_tlv_space; /* request message TLV area size */
static int rep_headroom; /* reply message headroom to use */
@@ -223,7 +221,7 @@ struct sk_buff *tipc_cfg_do_cmd(u32 orig_node, u16 cmd, const void *request_area
{
struct sk_buff *rep_tlv_buf;
- mutex_lock(&config_mutex);
+ rtnl_lock();
/* Save request and reply details in a well-known location */
req_tlv_area = request_area;
@@ -337,6 +335,6 @@ struct sk_buff *tipc_cfg_do_cmd(u32 orig_node, u16 cmd, const void *request_area
/* Return reply buffer */
exit:
- mutex_unlock(&config_mutex);
+ rtnl_unlock();
return rep_tlv_buf;
}
diff --git a/net/tipc/core.h b/net/tipc/core.h
index 8985bbc..36cbf15 100644
--- a/net/tipc/core.h
+++ b/net/tipc/core.h
@@ -56,7 +56,7 @@
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
-
+#include <linux/rtnetlink.h>
#define TIPC_MOD_VER "2.0.0"
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