mac80211: make alignment warning optional

Driver authors should be aware of the alignment requirements, but
not everybody cares about the warning. This patch makes it depend
on a new Kconfig symbol MAC80211_DEBUG_PACKET_ALIGNMENT which can
be enabled regardless of MAC80211_DEBUG and is recommended for
driver authors (only). This also restricts the warning to data
packets so other packets need not be realigned to not trigger the
warning.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index d44c872..535407d 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -340,11 +340,15 @@
 	return load;
 }
 
+#ifdef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
 static ieee80211_txrx_result
 ieee80211_rx_h_verify_ip_alignment(struct ieee80211_txrx_data *rx)
 {
 	int hdrlen;
 
+	if (!WLAN_FC_DATA_PRESENT(rx->fc))
+		return TXRX_CONTINUE;
+
 	/*
 	 * Drivers are required to align the payload data in a way that
 	 * guarantees that the contained IP header is aligned to a four-
@@ -371,11 +375,14 @@
 
 	return TXRX_CONTINUE;
 }
+#endif
 
 ieee80211_rx_handler ieee80211_rx_pre_handlers[] =
 {
 	ieee80211_rx_h_parse_qos,
+#ifdef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT
 	ieee80211_rx_h_verify_ip_alignment,
+#endif
 	NULL
 };