linux-kernel - [PATCH 4/11] use ether_addr_equal

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Date:	Mon, 30 Dec 2013 19:15:00 +0100
From:	Julia Lawall <Julia.Lawall@...6.fr>
To:	Johannes Berg <johannes.berg@...el.com>
Cc:	kernel-janitors@...r.kernel.org,
	Emmanuel Grumbach <emmanuel.grumbach@...el.com>,
	Intel Linux Wireless <ilw@...ux.intel.com>,
	"John W. Linville" <linville@...driver.com>,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 4/11]  use ether_addr_equal_64bits

From: Julia Lawall <Julia.Lawall@...6.fr>

Ether_addr_equal_64bits is more efficient than ether_addr_equal, and can be
used when each argument is an array within a structure that contains at
least two bytes of data beyond the array.

The structures involved are:
iwl_rxon_cmd defined in drivers/net/wireless/iwlwifi/dvm/commands.h and
ieee80211_hdr defined in include/linux/ieee80211.h

This was done using Coccinelle (http://coccinelle.lip6.fr/).

Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

---
The semantic patch used is rather long and can be found in message 0 of
this patch series.

 drivers/net/wireless/iwlwifi/dvm/rx.c   |    4 ++--
 drivers/net/wireless/iwlwifi/dvm/rxon.c |    8 ++++----
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/net/wireless/iwlwifi/dvm/rxon.c b/drivers/net/wireless/iwlwifi/dvm/rxon.c
index d7ce2f1..0439dd5 100644
--- a/drivers/net/wireless/iwlwifi/dvm/rxon.c
+++ b/drivers/net/wireless/iwlwifi/dvm/rxon.c
@@ -875,10 +875,10 @@ static int iwl_full_rxon_required(struct iwl_priv *priv,
 
 	/* These items are only settable from the full RXON command */
 	CHK(!iwl_is_associated_ctx(ctx));
-	CHK(!ether_addr_equal(staging->bssid_addr, active->bssid_addr));
-	CHK(!ether_addr_equal(staging->node_addr, active->node_addr));
-	CHK(!ether_addr_equal(staging->wlap_bssid_addr,
-			      active->wlap_bssid_addr));
+	CHK(!ether_addr_equal_64bits(staging->bssid_addr, active->bssid_addr));
+	CHK(!ether_addr_equal_64bits(staging->node_addr, active->node_addr));
+	CHK(!ether_addr_equal_64bits(staging->wlap_bssid_addr,
+				     active->wlap_bssid_addr));
 	CHK_NEQ(staging->dev_type, active->dev_type);
 	CHK_NEQ(staging->channel, active->channel);
 	CHK_NEQ(staging->air_propagation, active->air_propagation);
diff --git a/drivers/net/wireless/iwlwifi/dvm/rx.c b/drivers/net/wireless/iwlwifi/dvm/rx.c
index d71776d..d18570b 100644
--- a/drivers/net/wireless/iwlwifi/dvm/rx.c
+++ b/drivers/net/wireless/iwlwifi/dvm/rx.c
@@ -780,8 +780,8 @@ static void iwlagn_pass_packet_to_mac80211(struct iwl_priv *priv,
 	*/
 	if (unlikely(ieee80211_is_beacon(fc) && priv->passive_no_rx)) {
 		for_each_context(priv, ctx) {
-			if (!ether_addr_equal(hdr->addr3,
-					      ctx->active.bssid_addr))
+			if (!ether_addr_equal_64bits(hdr->addr3,
+						     ctx->active.bssid_addr))
 				continue;
 			iwlagn_lift_passive_no_rx(priv);
 		}
--
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