b43legacy: Clean up beacon IRQ

This patch ports commit c97a4ccc1fad35d3 "b43: Fix beacon BH update" to
b43legacy. It fixes beacon updating in the bottomhalf. In case the device
is busy, we will defer to later in the IRQ handler.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Acked-by: Michael Buesch <mb@bu3sch.de>
Tested-by: David Ellingsworth <david@identd.dyndns.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/b43legacy/xmit.h b/drivers/net/wireless/b43legacy/xmit.h
index 62e09d0..9163308 100644
--- a/drivers/net/wireless/b43legacy/xmit.h
+++ b/drivers/net/wireless/b43legacy/xmit.h
@@ -67,7 +67,9 @@
 #define B43legacy_TX4_EFT_RTSFBOFDM	0x0010 /* RTS/CTS fallback rate type */
 
 /* PHY TX control word */
-#define B43legacy_TX4_PHY_OFDM		0x0001 /* Data frame rate type */
+#define B43legacy_TX4_PHY_ENC		0x0003 /* Data frame encoding */
+#define B43legacy_TX4_PHY_ENC_CCK	0x0000 /* CCK */
+#define B43legacy_TX4_PHY_ENC_OFDM	0x0001 /* Data frame rate type */
 #define B43legacy_TX4_PHY_SHORTPRMBL	0x0010 /* Use short preamble */
 #define B43legacy_TX4_PHY_ANT		0x03C0 /* Antenna selection */
 #define  B43legacy_TX4_PHY_ANT0		0x0000 /* Use antenna 0 */