From: Alexander Aring <alex.aring@gmail.com>
Date: Mon, 27 Oct 2014 16:13:39 +0000 (+0100)
Subject: mac802154: rx: move rcu locking
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=e176b681b00d2b60e9231072d3ca841f9ddc74ea;p=openwrt%2Fstaging%2Fblogic.git

mac802154: rx: move rcu locking

Instead of twice lock and unlock mechanism this patch hold these locks
only once at one position.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
---

diff --git a/net/mac802154/rx.c b/net/mac802154/rx.c
index c2999804126a..689bb7ff5b2a 100644
--- a/net/mac802154/rx.c
+++ b/net/mac802154/rx.c
@@ -205,7 +205,6 @@ mac802154_wpans_rx(struct ieee802154_local *local, struct sk_buff *skb)
 		return;
 	}
 
-	rcu_read_lock();
 	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 		if (sdata->type != IEEE802154_DEV_WPAN ||
 		    !netif_running(sdata->dev))
@@ -215,7 +214,6 @@ mac802154_wpans_rx(struct ieee802154_local *local, struct sk_buff *skb)
 		skb = NULL;
 		break;
 	}
-	rcu_read_unlock();
 
 	if (skb)
 		kfree_skb(skb);
@@ -234,7 +232,6 @@ mac802154_monitors_rx(struct ieee802154_local *local, struct sk_buff *skb)
 	skb->pkt_type = PACKET_OTHERHOST;
 	skb->protocol = htons(ETH_P_IEEE802154);
 
-	rcu_read_lock();
 	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 		if (sdata->type != IEEE802154_DEV_MONITOR ||
 		    !netif_running(sdata->dev))
@@ -249,7 +246,6 @@ mac802154_monitors_rx(struct ieee802154_local *local, struct sk_buff *skb)
 
 		netif_rx_ni(skb2);
 	}
-	rcu_read_unlock();
 }
 
 void ieee802154_rx(struct ieee802154_hw *hw, struct sk_buff *skb)
@@ -273,9 +269,13 @@ void ieee802154_rx(struct ieee802154_hw *hw, struct sk_buff *skb)
 		skb_trim(skb, skb->len - 2); /* CRC */
 	}
 
+	rcu_read_lock();
+
 	mac802154_monitors_rx(local, skb);
 	mac802154_wpans_rx(local, skb);
 
+	rcu_read_unlock();
+
 	return;
 
 fail: