From: Ying Xue <ying.xue@windriver.com>
Date: Mon, 21 Apr 2014 02:55:47 +0000 (+0800)
Subject: tipc: use RCU to protect media_ptr pointer
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=2231c5af451e4b7ae3cc56eaa4653af6ede51109;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

tipc: use RCU to protect media_ptr pointer

Now the media_ptr pointer is protected with tipc_net_lock write lock
on write side; tipc_net_lock read lock is used to read side. As the
part of effort of eliminating tipc_net_lock, we decide to adjust the
locking policy of media_ptr pointer protection: on write side, RTNL
lock is use while on read side RCU read lock is applied.

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>
---

diff --git a/net/tipc/bearer.c b/net/tipc/bearer.c
index e0625e9e2c72..c24a35114fd7 100644
--- a/net/tipc/bearer.c
+++ b/net/tipc/bearer.c
@@ -458,7 +458,7 @@ int tipc_enable_l2_media(struct tipc_bearer *b)
 		return -ENODEV;
 
 	/* Associate TIPC bearer with Ethernet bearer */
-	b->media_ptr = dev;
+	rcu_assign_pointer(b->media_ptr, dev);
 	memset(b->bcast_addr.value, 0, sizeof(b->bcast_addr.value));
 	memcpy(b->bcast_addr.value, dev->broadcast, b->media->hwaddr_len);
 	b->bcast_addr.media_id = b->media->type_id;
@@ -477,7 +477,10 @@ int tipc_enable_l2_media(struct tipc_bearer *b)
  */
 void tipc_disable_l2_media(struct tipc_bearer *b)
 {
-	struct net_device *dev = (struct net_device *)b->media_ptr;
+	struct net_device *dev;
+
+	dev = (struct net_device *)rtnl_dereference(b->media_ptr);
+	RCU_INIT_POINTER(b->media_ptr, NULL);
 	RCU_INIT_POINTER(dev->tipc_ptr, NULL);
 	dev_put(dev);
 }
@@ -492,8 +495,12 @@ int tipc_l2_send_msg(struct sk_buff *buf, struct tipc_bearer *b,
 		     struct tipc_media_addr *dest)
 {
 	struct sk_buff *clone;
+	struct net_device *dev;
 	int delta;
-	struct net_device *dev = (struct net_device *)b->media_ptr;
+
+	dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr);
+	if (!dev)
+		return 0;
 
 	clone = skb_clone(buf, GFP_ATOMIC);
 	if (!clone)
diff --git a/net/tipc/bearer.h b/net/tipc/bearer.h
index 2fa86bd67c0a..a983b3005e71 100644
--- a/net/tipc/bearer.h
+++ b/net/tipc/bearer.h
@@ -128,7 +128,7 @@ struct tipc_media {
  * care of initializing all other fields.
  */
 struct tipc_bearer {
-	void *media_ptr;			/* initalized by media */
+	void __rcu *media_ptr;			/* initalized by media */
 	u32 mtu;				/* initalized by media */
 	struct tipc_media_addr addr;		/* initalized by media */
 	char name[TIPC_MAX_BEARER_NAME];