diff options
| author | Martin Townsend <mtownsend1973@gmail.com> | 2014-10-13 12:00:56 +0200 |
|---|---|---|
| committer | Marcel Holtmann <marcel@holtmann.org> | 2014-10-25 07:56:25 +0200 |
| commit | 11e3ff7072789ad4585870cbdde1be10c45f1cc4 (patch) | |
| tree | 0a8e62cbf7eaeb33ac5931f9cea2321abf730ce5 /net/bluetooth/6lowpan.c | |
| parent | Bluetooth: 6lowpan: remove unnecessary codes in give_skb_to_upper (diff) | |
| download | linux-11e3ff7072789ad4585870cbdde1be10c45f1cc4.tar.xz linux-11e3ff7072789ad4585870cbdde1be10c45f1cc4.zip | |
6lowpan: Use skb_cow in IPHC decompression.
Currently there are potentially 2 skb_copy_expand calls in IPHC
decompression. This patch replaces this with one call to
skb_cow which will check to see if there is enough headroom
first to ensure it's only done if necessary and will handle
alignment issues for cache.
As skb_cow uses pskb_expand_head we ensure the skb isn't shared from
bluetooth and ieee802.15.4 code that use the IPHC decompression.
Signed-off-by: Martin Townsend <martin.townsend@xsilon.com>
Acked-by: Alexander Aring <alex.aring@gmail.com>
Acked-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to 'net/bluetooth/6lowpan.c')
| -rw-r--r-- | net/bluetooth/6lowpan.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/net/bluetooth/6lowpan.c b/net/bluetooth/6lowpan.c index 9b5c89b18718..6c5c2eff45bd 100644 --- a/net/bluetooth/6lowpan.c +++ b/net/bluetooth/6lowpan.c @@ -309,6 +309,10 @@ static int recv_pkt(struct sk_buff *skb, struct net_device *dev, if (dev->type != ARPHRD_6LOWPAN) goto drop; + skb = skb_share_check(skb, GFP_ATOMIC); + if (!skb) + goto drop; + /* check that it's our buffer */ if (skb->data[0] == LOWPAN_DISPATCH_IPV6) { /* Copy the packet so that the IPv6 header is |