summaryrefslogtreecommitdiffstats
path: root/drivers/net/wireless
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/net/wireless')
-rw-r--r--drivers/net/wireless/ath9k/recv.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/net/wireless/ath9k/recv.c b/drivers/net/wireless/ath9k/recv.c
index cb449f0b417..f2327d8e9c2 100644
--- a/drivers/net/wireless/ath9k/recv.c
+++ b/drivers/net/wireless/ath9k/recv.c
@@ -571,8 +571,16 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush)
hdr = (struct ieee80211_hdr *)skb->data;
hdrlen = ieee80211_get_hdrlen_from_skb(skb);
- if (hdrlen & 3) {
- padsize = hdrlen % 4;
+ /* The MAC header is padded to have 32-bit boundary if the
+ * packet payload is non-zero. The general calculation for
+ * padsize would take into account odd header lengths:
+ * padsize = (4 - hdrlen % 4) % 4; However, since only
+ * even-length headers are used, padding can only be 0 or 2
+ * bytes and we can optimize this a bit. In addition, we must
+ * not try to remove padding from short control frames that do
+ * not have payload. */
+ padsize = hdrlen & 3;
+ if (padsize && hdrlen >= 24) {
memmove(skb->data + padsize, skb->data, hdrlen);
skb_pull(skb, padsize);
}