mac80211: rewrite fragmentation

Fragmentation currently uses an allocated array to store the
fragment skbs, and then keeps track of which have been sent
and which are still pending etc. This is rather complicated;
make it simpler by just chaining the fragments into skb->next
and removing from that list when sent. Also simplifies all
code that needs to touch fragments, since it now only needs
to walk the skb->next list.

This is a prerequisite for fixing the stored packet code,
which I need to do for proper aggregation packet storing.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Reviewed-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 8 insertions, 20 deletions

diff --git a/net/mac80211/wpa.c b/net/mac80211/wpa.c
index 9101b48ec2a..4f8bfea278f 100644
--- a/net/mac80211/wpa.c
+++ b/net/mac80211/wpa.c
@@ -196,19 +196,13 @@ ieee80211_tx_result
 ieee80211_crypto_tkip_encrypt(struct ieee80211_tx_data *tx)
 {
         struct sk_buff *skb = tx->skb;
-        int i;
 
         ieee80211_tx_set_protected(tx);
 
-        if (tkip_encrypt_skb(tx, skb) < 0)
-                return TX_DROP;
-
-        if (tx->extra_frag) {
-                for (i = 0; i < tx->num_extra_frag; i++) {
-                        if (tkip_encrypt_skb(tx, tx->extra_frag[i]))
-                                return TX_DROP;
-                }
-        }
+        do {
+                if (tkip_encrypt_skb(tx, skb) < 0)
+                        return TX_DROP;
+        } while ((skb = skb->next));
 
         return TX_CONTINUE;
 }
@@ -428,19 +422,13 @@ ieee80211_tx_result
 ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx)
 {
         struct sk_buff *skb = tx->skb;
-        int i;
 
         ieee80211_tx_set_protected(tx);
 
-        if (ccmp_encrypt_skb(tx, skb) < 0)
-                return TX_DROP;
-
-        if (tx->extra_frag) {
-                for (i = 0; i < tx->num_extra_frag; i++) {
-                        if (ccmp_encrypt_skb(tx, tx->extra_frag[i]))
-                                return TX_DROP;
-                }
-        }
+        do {
+                if (ccmp_encrypt_skb(tx, skb) < 0)
+                        return TX_DROP;
+        } while ((skb = skb->next));
 
         return TX_CONTINUE;
 }