ieee802154: 6lowpan: fix byteorder for frag tag

This patch fix byteorder issues with fragment tag of generation 802.15.4
6LoWPAN fragment header.

net/ieee802154/6lowpan_rtnl.c:278:54: warning restricted __be16 degrades to integer
net/ieee802154/6lowpan_rtnl.c:278:18: warning: incorrect type in assignment (different base types)
net/ieee802154/6lowpan_rtnl.c:278:18:    expected restricted __be16 [usertype] frag_tag
net/ieee802154/6lowpan_rtnl.c:278:18:    got unsigned short

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

1 files changed, 5 insertions, 4 deletions

diff --git a/net/ieee802154/6lowpan_rtnl.c b/net/ieee802154/6lowpan_rtnl.c
index 56252ee157c9..2d547ea190e8 100644
--- a/net/ieee802154/6lowpan_rtnl.c
+++ b/net/ieee802154/6lowpan_rtnl.c
@@ -63,7 +63,7 @@ static LIST_HEAD(lowpan_devices);
 struct lowpan_dev_info {
         struct net_device       *real_dev; /* real WPAN device ptr */
         struct mutex            dev_list_mtx; /* mutex for list ops */
-        __be16                  fragment_tag;
+        u16                     fragment_tag;
 };
 
 struct lowpan_dev_record {
@@ -275,7 +275,8 @@ lowpan_xmit_fragmented(struct sk_buff *skb, struct net_device *dev,
 
         dgram_size = lowpan_uncompress_size(skb, &dgram_offset) -
                      skb->mac_len;
-        frag_tag = lowpan_dev_info(dev)->fragment_tag++;
+        frag_tag = htons(lowpan_dev_info(dev)->fragment_tag);
+        lowpan_dev_info(dev)->fragment_tag++;
 
         frag_hdr[0] = LOWPAN_DISPATCH_FRAG1 | ((dgram_size >> 8) & 0x07);
         frag_hdr[1] = dgram_size & 0xff;
@@ -294,7 +295,7 @@ lowpan_xmit_fragmented(struct sk_buff *skb, struct net_device *dev,
                                   frag_len + skb_network_header_len(skb));
         if (rc) {
                 pr_debug("%s unable to send FRAG1 packet (tag: %d)",
-                         __func__, frag_tag);
+                         __func__, ntohs(frag_tag));
                 goto err;
         }
 
@@ -315,7 +316,7 @@ lowpan_xmit_fragmented(struct sk_buff *skb, struct net_device *dev,
                                           frag_len);
                 if (rc) {
                         pr_debug("%s unable to send a FRAGN packet. (tag: %d, offset: %d)\n",
-                                 __func__, frag_tag, skb_offset);
+                                 __func__, ntohs(frag_tag), skb_offset);
                         goto err;
                 }
         } while (skb_unprocessed > frag_cap);