isdn: Correct comparison of skb->tail and skb-transport_header

This corrects an regression introduced by "net: Use 16bits for *_headers
fields of struct skbuff" when NET_SKBUFF_DATA_USES_OFFSET is not set. In
that case skb->tail will be a pointer whereas skb->transport_header
will be an offset from head. This is corrected by using wrappers that
ensure that the comparison is always between pointers.

Signed-off-by: Simon Horman <horms@verge.net.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/isdn/i4l/isdn_net.c b/drivers/isdn/i4l/isdn_net.c
index 88d657dff47454a3c374469db0ac51d03c53e502..8b98d53d99764be297362969fc1c88d1865639ec 100644 (file)
--- a/drivers/isdn/i4l/isdn_net.c
+++ b/drivers/isdn/i4l/isdn_net.c
@@ -885,7 +885,7 @@ isdn_net_log_skb(struct sk_buff *skb, isdn_net_local *lp)
 
        addinfo[0] = '\0';
        /* This check stolen from 2.1.72 dev_queue_xmit_nit() */
-       if (p < skb->data || skb->network_header >= skb->tail) {
+       if (p < skb->data || skb_network_header(skb) >= skb_tail_pointer(skb)) {
                /* fall back to old isdn_net_log_packet method() */
                char *buf = skb->data;