From 989d433dca558fda85e592fc675af2a59af88858 Mon Sep 17 00:00:00 2001
From: Alexander Aring <alex.aring@gmail.com>
Date: Wed, 2 Sep 2015 14:21:21 +0200
Subject: ieee802154: 6lowpan: change if lowpan dev is running

We don't need to check if the wpan interface is running because the
lowpan_rcv is the packet layer receive handler for the wpan interface.

Instead doing a check if wpan interface is running we should check if
the lowpan interface is running before starting 6lowpan adaptation layer.

Reviewed-by: Stefan Schmidt <stefan@osg.samsung.com>
Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

diff --git a/net/ieee802154/6lowpan/rx.c b/net/ieee802154/6lowpan/rx.c
index b1442f3..c529d9f 100644
--- a/net/ieee802154/6lowpan/rx.c
+++ b/net/ieee802154/6lowpan/rx.c
@@ -65,19 +65,20 @@ static int lowpan_rcv(struct sk_buff *skb, struct net_device *wdev,
 		      struct packet_type *pt, struct net_device *orig_wdev)
 {
 	struct ieee802154_hdr hdr;
+	struct net_device *ldev;
 	int ret;
 
-	if (wdev->type != ARPHRD_IEEE802154 ||
-	    !wdev->ieee802154_ptr->lowpan_dev)
+	if (wdev->type != ARPHRD_IEEE802154)
+		goto drop;
+
+	ldev = wdev->ieee802154_ptr->lowpan_dev;
+	if (!ldev || !netif_running(ldev))
 		goto drop;
 
 	skb = skb_share_check(skb, GFP_ATOMIC);
 	if (!skb)
 		goto drop;
 
-	if (!netif_running(wdev))
-		goto drop_skb;
-
 	if (skb->pkt_type == PACKET_OTHERHOST)
 		goto drop_skb;
 
-- 
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