mac80211: make align adjustment code support paged SKB

This fixed a BUG_ON in __skb_trim() when paged rx is used in
iwlwifi driver. Yes, the whole mac80211 stack doesn't support
paged SKB yet. But let's start the work slowly from small
code snippets.

Reported-and-tested-by: Abhijeet Kolekar <abhijeet.kolekar@intel.com>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 798fa82b6ae3..c832d408187e 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -1326,10 +1326,10 @@ ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
                                 skb = NULL;
                         } else {
                                 u8 *data = skb->data;
-                                size_t len = skb->len;
-                                u8 *new = __skb_push(skb, align);
-                                memmove(new, data, len);
-                                __skb_trim(skb, len);
+                                size_t len = skb_headlen(skb);
+                                skb->data -= align;
+                                memmove(skb->data, data, len);
+                                skb_set_tail_pointer(skb, len);
                         }
                 }
 #endif