rt2x00: Put 802.11 data on 4 byte boundary
Check the size of the ieee80211 header during rxdone
and make sure the data behind the ieee80211 header
is placed on a 4 byte boundary.
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/rt2x00/rt2x00usb.c b/drivers/net/wireless/rt2x00/rt2x00usb.c
index 1f5675d..ab4797e 100644
--- a/drivers/net/wireless/rt2x00/rt2x00usb.c
+++ b/drivers/net/wireless/rt2x00/rt2x00usb.c
@@ -221,7 +221,9 @@
struct data_ring *ring = entry->ring;
struct rt2x00_dev *rt2x00dev = ring->rt2x00dev;
struct sk_buff *skb;
+ struct ieee80211_hdr *hdr;
struct rxdata_entry_desc desc;
+ int header_size;
int frame_size;
if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
@@ -253,9 +255,20 @@
skb_put(skb, frame_size);
/*
- * Trim the skb_buffer to only contain the valid
- * frame data (so ignore the device's descriptor).
+ * The data behind the ieee80211 header must be
+ * aligned on a 4 byte boundary.
+ * After that trim the entire buffer down to only
+ * contain the valid frame data excluding the device
+ * descriptor.
*/
+ hdr = (struct ieee80211_hdr *)entry->skb->data;
+ header_size =
+ ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control));
+
+ if (header_size % 4 == 0) {
+ skb_push(entry->skb, 2);
+ memmove(entry->skb->data, entry->skb->data + 2, skb->len - 2);
+ }
skb_trim(entry->skb, desc.size);
/*