From d10f2150eab62f633aeae36cf4612d1f648a817e Mon Sep 17 00:00:00 2001
From: "David S. Miller" <davem@goma.davemloft.net>
Date: Thu, 24 Jan 2008 16:57:39 -0800
Subject: [PATCH] [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>
---
 net/mac80211/rx.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 00f908d9275e..a7263fc476bd 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -1443,6 +1443,7 @@ void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
 	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 @@ void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
 	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++;
 
-- 
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