diff options
| author | Alexander Aring <alex.aring@gmail.com> | 2014-06-02 13:21:57 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-06-02 10:39:42 -0700 |
| commit | 51263fffadee28c99152fb78a2d41e3d10c9b0b5 (patch) | |
| tree | 08ea7ae9257bef3c14ff29163a07de3c5c00b2d0 | |
| parent | 86c92ee3a2a22bf87537072f0f2021089ab87395 (diff) | |
6lowpan_rtnl: fix fragmentation with two fragments
This patch fix the 6LoWPAN fragmentation for the case if we have exactly
two fragments. The problem is that the (skb_unprocessed >= frag_cap)
condition is always false on the second fragment after sending the first
fragment. A fragmentation with only one fragment doesn't make any sense.
The solution is that we use a do while loop here, that ensures we sending
always a minimum of two fragments if we need a fragmentation.
This issue was introduced by commit d4b2816d67d6e07b2f27037f282d8db03a5829d7
("6lowpan: fix fragmentation").
Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/ieee802154/6lowpan_rtnl.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/ieee802154/6lowpan_rtnl.c b/net/ieee802154/6lowpan_rtnl.c index 1ae8a5628fb5..9d57026fd9d5 100644 --- a/net/ieee802154/6lowpan_rtnl.c +++ b/net/ieee802154/6lowpan_rtnl.c @@ -312,7 +312,7 @@ lowpan_xmit_fragmented(struct sk_buff *skb, struct net_device *dev, frag_hdr[0] |= LOWPAN_DISPATCH_FRAGN; frag_cap = round_down(payload_cap - LOWPAN_FRAGN_HEAD_SIZE, 8); - while (skb_unprocessed >= frag_cap) { + do { dgram_offset += frag_len; skb_offset += frag_len; skb_unprocessed -= frag_len; @@ -328,7 +328,7 @@ lowpan_xmit_fragmented(struct sk_buff *skb, struct net_device *dev, __func__, frag_tag, skb_offset); goto err; } - } + } while (skb_unprocessed >= frag_cap); consume_skb(skb); return NET_XMIT_SUCCESS; |