[MAC80211]: Revert unaligned warning removal.
For release Linux removed this warning, but we want it
back for development.
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 00f908d..a7263fc 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -1443,6 +1443,7 @@
struct ieee80211_sub_if_data *prev = NULL;
struct sk_buff *skb_new;
u8 *bssid;
+ int hdrlen;
/*
* key references and virtual interfaces are protected using RCU
@@ -1472,6 +1473,18 @@
rx.fc = le16_to_cpu(hdr->frame_control);
type = rx.fc & IEEE80211_FCTL_FTYPE;
+ /*
+ * Drivers are required to align the payload data to a four-byte
+ * boundary, so the last two bits of the address where it starts
+ * may not be set. The header is required to be directly before
+ * the payload data, padding like atheros hardware adds which is
+ * inbetween the 802.11 header and the payload is not supported,
+ * the driver is required to move the 802.11 header further back
+ * in that case.
+ */
+ hdrlen = ieee80211_get_hdrlen(rx.fc);
+ WARN_ON_ONCE(((unsigned long)(skb->data + hdrlen)) & 3);
+
if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT)
local->dot11ReceivedFragmentCount++;