[PATCH] rt2x00: Remove duplicate code in MAC & BSSID handling

The various drivers contained duplicate code to handle the
MAC and BSSID initialization correctly. This moves the
address copy to little endian variables to rt2x00config.
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rt2x00/rt2400pci.c

@@ -249,32 +249,18 @@ static int rt2400pci_rfkill_poll(struct rt2x00_dev *rt2x00dev)
 /*
  * Configuration handlers.
  */
-static void rt2400pci_config_mac_addr(struct rt2x00_dev *rt2x00dev, u8 *addr)
+static void rt2400pci_config_mac_addr(struct rt2x00_dev *rt2x00dev,
+				      __le32 *mac)
 {
-	__le32 reg[2];
-
-	memset(&reg, 0, sizeof(reg));
-	memcpy(&reg, addr, ETH_ALEN);
-
-	/*
-	 * The MAC address is passed to us as an array of bytes,
-	 * that array is little endian, so no need for byte ordering.
-	 */
-	rt2x00pci_register_multiwrite(rt2x00dev, CSR3, &reg, sizeof(reg));
+	rt2x00pci_register_multiwrite(rt2x00dev, CSR3, mac,
+				      (2 * sizeof(__le32)));
 }
 
-static void rt2400pci_config_bssid(struct rt2x00_dev *rt2x00dev, u8 *bssid)
+static void rt2400pci_config_bssid(struct rt2x00_dev *rt2x00dev,
+				   __le32 *bssid)
 {
-	__le32 reg[2];
-
-	memset(&reg, 0, sizeof(reg));
-	memcpy(&reg, bssid, ETH_ALEN);
-
-	/*
-	 * The BSSID is passed to us as an array of bytes,
-	 * that array is little endian, so no need for byte ordering.
-	 */
-	rt2x00pci_register_multiwrite(rt2x00dev, CSR5, &reg, sizeof(reg));
+	rt2x00pci_register_multiwrite(rt2x00dev, CSR5, bssid,
+				      (2 * sizeof(__le32)));
 }
 
 static void rt2400pci_config_type(struct rt2x00_dev *rt2x00dev, int type)

drivers/net/wireless/rt2x00/rt2500pci.c

@@ -249,32 +249,18 @@ static int rt2500pci_rfkill_poll(struct rt2x00_dev *rt2x00dev)
 /*
  * Configuration handlers.
  */
-static void rt2500pci_config_mac_addr(struct rt2x00_dev *rt2x00dev, u8 *addr)
+static void rt2500pci_config_mac_addr(struct rt2x00_dev *rt2x00dev,
+				      __le32 *mac)
 {
-	__le32 reg[2];
-
-	memset(&reg, 0, sizeof(reg));
-	memcpy(&reg, addr, ETH_ALEN);
-
-	/*
-	 * The MAC address is passed to us as an array of bytes,
-	 * that array is little endian, so no need for byte ordering.
-	 */
-	rt2x00pci_register_multiwrite(rt2x00dev, CSR3, &reg, sizeof(reg));
+	rt2x00pci_register_multiwrite(rt2x00dev, CSR3, mac,
+				      (2 * sizeof(__le32)));
 }
 
-static void rt2500pci_config_bssid(struct rt2x00_dev *rt2x00dev, u8 *bssid)
+static void rt2500pci_config_bssid(struct rt2x00_dev *rt2x00dev,
+				   __le32 *bssid)
 {
-	__le32 reg[2];
-
-	memset(&reg, 0, sizeof(reg));
-	memcpy(&reg, bssid, ETH_ALEN);
-
-	/*
-	 * The BSSID is passed to us as an array of bytes,
-	 * that array is little endian, so no need for byte ordering.
-	 */
-	rt2x00pci_register_multiwrite(rt2x00dev, CSR5, &reg, sizeof(reg));
+	rt2x00pci_register_multiwrite(rt2x00dev, CSR5, bssid,
+				      (2 * sizeof(__le32)));
 }
 
 static void rt2500pci_config_type(struct rt2x00_dev *rt2x00dev, const int type)

drivers/net/wireless/rt2x00/rt2500usb.c

@@ -254,32 +254,18 @@ static const struct rt2x00debug rt2500usb_rt2x00debug = {
 /*
  * Configuration handlers.
  */
-static void rt2500usb_config_mac_addr(struct rt2x00_dev *rt2x00dev, u8 *addr)
+static void rt2500usb_config_mac_addr(struct rt2x00_dev *rt2x00dev,
+				      __le32 *mac)
 {
-	__le16 reg[3];
-
-	memset(&reg, 0, sizeof(reg));
-	memcpy(&reg, addr, ETH_ALEN);
-
-	/*
-	 * The MAC address is passed to us as an array of bytes,
-	 * that array is little endian, so no need for byte ordering.
-	 */
-	rt2500usb_register_multiwrite(rt2x00dev, MAC_CSR2, &reg, sizeof(reg));
+	rt2500usb_register_multiwrite(rt2x00dev, MAC_CSR2, &mac,
+				      (3 * sizeof(__le16)));
 }
 
-static void rt2500usb_config_bssid(struct rt2x00_dev *rt2x00dev, u8 *bssid)
+static void rt2500usb_config_bssid(struct rt2x00_dev *rt2x00dev,
+				   __le32 *bssid)
 {
-	__le16 reg[3];
-
-	memset(&reg, 0, sizeof(reg));
-	memcpy(&reg, bssid, ETH_ALEN);
-
-	/*
-	 * The BSSID is passed to us as an array of bytes,
-	 * that array is little endian, so no need for byte ordering.
-	 */
-	rt2500usb_register_multiwrite(rt2x00dev, MAC_CSR5, &reg, sizeof(reg));
+	rt2500usb_register_multiwrite(rt2x00dev, MAC_CSR5, bssid,
+				      (3 * sizeof(__le16)));
 }
 
 static void rt2500usb_config_type(struct rt2x00_dev *rt2x00dev, const int type)

drivers/net/wireless/rt2x00/rt2x00.h

@@ -408,8 +408,8 @@ struct rt2x00lib_ops {
 	/*
 	 * Configuration handlers.
 	 */
-	void (*config_mac_addr) (struct rt2x00_dev *rt2x00dev, u8 *mac);
-	void (*config_bssid) (struct rt2x00_dev *rt2x00dev, u8 *bssid);
+	void (*config_mac_addr) (struct rt2x00_dev *rt2x00dev, __le32 *mac);
+	void (*config_bssid) (struct rt2x00_dev *rt2x00dev, __le32 *bssid);
 	void (*config_packet_filter) (struct rt2x00_dev *rt2x00dev,
 				      const unsigned int filter);
 	void (*config_type) (struct rt2x00_dev *rt2x00dev, const int type);

drivers/net/wireless/rt2x00/rt2x00config.c

@@ -34,16 +34,44 @@
 #include "rt2x00.h"
 #include "rt2x00lib.h"
 
+
+/*
+ * The MAC and BSSID addressess are simple array of bytes,
+ * these arrays are little endian, so when sending the addressess
+ * to the drivers, copy the it into a endian-signed variable.
+ *
+ * Note that all devices (except rt2500usb) have 32 bits
+ * register word sizes. This means that whatever variable we
+ * pass _must_ be a multiple of 32 bits. Otherwise the device
+ * might not accept what we are sending to it.
+ * This will also make it easier for the driver to write
+ * the data to the device.
+ *
+ * Also note that when NULL is passed as address the
+ * we will send 00:00:00:00:00 to the device to clear the address.
+ * This will prevent the device being confused when it wants
+ * to ACK frames or consideres itself associated.
+ */
 void rt2x00lib_config_mac_addr(struct rt2x00_dev *rt2x00dev, u8 *mac)
 {
+	__le32 reg[2];
+
+	memset(&reg, 0, sizeof(reg));
 	if (mac)
-		rt2x00dev->ops->lib->config_mac_addr(rt2x00dev, mac);
+		memcpy(&reg, mac, ETH_ALEN);
+
+	rt2x00dev->ops->lib->config_mac_addr(rt2x00dev, &reg[0]);
 }
 
 void rt2x00lib_config_bssid(struct rt2x00_dev *rt2x00dev, u8 *bssid)
 {
+	__le32 reg[2];
+
+	memset(&reg, 0, sizeof(reg));
 	if (bssid)
-		rt2x00dev->ops->lib->config_bssid(rt2x00dev, bssid);
+		memcpy(&reg, bssid, ETH_ALEN);
+
+	rt2x00dev->ops->lib->config_bssid(rt2x00dev, &reg[0]);
 }
 
 void rt2x00lib_config_type(struct rt2x00_dev *rt2x00dev, int type)

drivers/net/wireless/rt2x00/rt61pci.c

@@ -274,42 +274,28 @@ static int rt61pci_rfkill_poll(struct rt2x00_dev *rt2x00dev)
 /*
  * Configuration handlers.
  */
-static void rt61pci_config_mac_addr(struct rt2x00_dev *rt2x00dev, u8 *addr)
+static void rt61pci_config_mac_addr(struct rt2x00_dev *rt2x00dev, __le32 *mac)
 {
-	__le32 reg[2];
 	u32 tmp;
 
-	memset(&reg, 0, sizeof(reg));
-	memcpy(&reg, addr, ETH_ALEN);
-
-	tmp = le32_to_cpu(reg[1]);
+	tmp = le32_to_cpu(mac[1]);
 	rt2x00_set_field32(&tmp, MAC_CSR3_UNICAST_TO_ME_MASK, 0xff);
-	reg[1] = cpu_to_le32(tmp);
+	mac[1] = cpu_to_le32(tmp);
 
-	/*
-	 * The MAC address is passed to us as an array of bytes,
-	 * that array is little endian, so no need for byte ordering.
-	 */
-	rt2x00pci_register_multiwrite(rt2x00dev, MAC_CSR2, &reg, sizeof(reg));
+	rt2x00pci_register_multiwrite(rt2x00dev, MAC_CSR2, mac,
+				      (2 * sizeof(__le32)));
 }
 
-static void rt61pci_config_bssid(struct rt2x00_dev *rt2x00dev, u8 *bssid)
+static void rt61pci_config_bssid(struct rt2x00_dev *rt2x00dev, __le32 *bssid)
 {
-	__le32 reg[2];
 	u32 tmp;
 
-	memset(&reg, 0, sizeof(reg));
-	memcpy(&reg, bssid, ETH_ALEN);
-
-	tmp = le32_to_cpu(reg[1]);
+	tmp = le32_to_cpu(bssid[1]);
 	rt2x00_set_field32(&tmp, MAC_CSR5_BSS_ID_MASK, 3);
-	reg[1] = cpu_to_le32(tmp);
+	bssid[1] = cpu_to_le32(tmp);
 
-	/*
-	 * The BSSID is passed to us as an array of bytes,
-	 * that array is little endian, so no need for byte ordering.
-	 */
-	rt2x00pci_register_multiwrite(rt2x00dev, MAC_CSR4, &reg, sizeof(reg));
+	rt2x00pci_register_multiwrite(rt2x00dev, MAC_CSR4, bssid,
+				      (2 * sizeof(__le32)));
 }
 
 static void rt61pci_config_type(struct rt2x00_dev *rt2x00dev, const int type)

drivers/net/wireless/rt2x00/rt73usb.c

@@ -255,42 +255,28 @@ static const struct rt2x00debug rt73usb_rt2x00debug = {
 /*
  * Configuration handlers.
  */
-static void rt73usb_config_mac_addr(struct rt2x00_dev *rt2x00dev, u8 *addr)
+static void rt73usb_config_mac_addr(struct rt2x00_dev *rt2x00dev, __le32 *mac)
 {
-	__le32 reg[2];
 	u32 tmp;
 
-	memset(&reg, 0, sizeof(reg));
-	memcpy(&reg, addr, ETH_ALEN);
-
-	tmp = le32_to_cpu(reg[1]);
+	tmp = le32_to_cpu(mac[1]);
 	rt2x00_set_field32(&tmp, MAC_CSR3_UNICAST_TO_ME_MASK, 0xff);
-	reg[1] = cpu_to_le32(tmp);
+	mac[1] = cpu_to_le32(tmp);
 
-	/*
-	 * The MAC address is passed to us as an array of bytes,
-	 * that array is little endian, so no need for byte ordering.
-	 */
-	rt73usb_register_multiwrite(rt2x00dev, MAC_CSR2, &reg, sizeof(reg));
+	rt73usb_register_multiwrite(rt2x00dev, MAC_CSR2, mac,
+				    (2 * sizeof(__le32)));
 }
 
-static void rt73usb_config_bssid(struct rt2x00_dev *rt2x00dev, u8 *bssid)
+static void rt73usb_config_bssid(struct rt2x00_dev *rt2x00dev, __le32 *bssid)
 {
-	__le32 reg[2];
 	u32 tmp;
 
-	memset(&reg, 0, sizeof(reg));
-	memcpy(&reg, bssid, ETH_ALEN);
-
-	tmp = le32_to_cpu(reg[1]);
+	tmp = le32_to_cpu(bssid[1]);
 	rt2x00_set_field32(&tmp, MAC_CSR5_BSS_ID_MASK, 3);
-	reg[1] = cpu_to_le32(tmp);
+	bssid[1] = cpu_to_le32(tmp);
 
-	/*
-	 * The BSSID is passed to us as an array of bytes,
-	 * that array is little endian, so no need for byte ordering.
-	 */
-	rt73usb_register_multiwrite(rt2x00dev, MAC_CSR4, &reg, sizeof(reg));
+	rt73usb_register_multiwrite(rt2x00dev, MAC_CSR4, bssid,
+				    (2 * sizeof(__le32)));
 }
 
 static void rt73usb_config_type(struct rt2x00_dev *rt2x00dev, const int type)