rt2x00: Fix WPA TKIP Michael MIC failures.

As reported and found by Johannes Stezenbach:
rt2800{pci,usb} do not report the Michael MIC in RXed frames, but do check
the Michael MIC in hardware. Therefore we have to report to mac80211 that the
received frame does not include the Michael MIC.
Signed-off-by: Gertjan van Wingerde <gwingerde@gmail.com>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rt2x00/rt2800pci.c

@@ -675,6 +675,12 @@ static void rt2800pci_fill_rxdone(struct queue_entry *entry,
 		 */
 		rxdesc->flags |= RX_FLAG_IV_STRIPPED;
 
+		/*
+		 * The hardware has already checked the Michael Mic and has
+		 * stripped it from the frame. Signal this to mac80211.
+		 */
+		rxdesc->flags |= RX_FLAG_MMIC_STRIPPED;
+
 		if (rxdesc->cipher_status == RX_CRYPTO_SUCCESS)
 			rxdesc->flags |= RX_FLAG_DECRYPTED;
 		else if (rxdesc->cipher_status == RX_CRYPTO_FAIL_MIC)

drivers/net/wireless/rt2x00/rt2800usb.c

@@ -484,6 +484,12 @@ static void rt2800usb_fill_rxdone(struct queue_entry *entry,
 		 */
 		rxdesc->flags |= RX_FLAG_IV_STRIPPED;
 
+		/*
+		 * The hardware has already checked the Michael Mic and has
+		 * stripped it from the frame. Signal this to mac80211.
+		 */
+		rxdesc->flags |= RX_FLAG_MMIC_STRIPPED;
+
 		if (rxdesc->cipher_status == RX_CRYPTO_SUCCESS)
 			rxdesc->flags |= RX_FLAG_DECRYPTED;
 		else if (rxdesc->cipher_status == RX_CRYPTO_FAIL_MIC)