commit 8af244ccb14a4367568db11c5e78b45a4c2cf77e
author Ivo van Doorn <ivdoorn@gmail.com> Sun Mar 09 22:42:59 2008 +0100
committer John W. Linville <linville@tuxdriver.com> Thu Mar 13 16:02:35 2008 -0400
tree 350727822602b851dcc2d31ad7a64fe7c4528a88
parent 3976ae6c2b09608cd6a13663737a6b219245b651

rt2x00: Only disable beaconing just before beacon update

We should not write 0 to the beacon sync register during
config_intf() since that will clear out the beacon interval
and forces the beacon to be send out at the lowest interval.
(reported by Mattias Nissler).

The side effect of the same bug was that while working with
multiple virtual AP interfaces a change for any of those
interfaces would disable beaconing untill an beacon update
was provided.

This is resolved by only updating the TSF_SYNC value during
config_intf(). In update_beacon() we disable beaconing
temporarily to prevent fake beacons to be transmitted.
Finally kick_tx_queue() will enable beaconing again.

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rt2x00/rt2500usb.c

diff --git a/drivers/net/wireless/rt2x00/rt2500usb.c b/drivers/net/wireless/rt2x00/rt2500usb.c
index 559131f..b6c6f7d 100644
--- a/drivers/net/wireless/rt2x00/rt2500usb.c
+++ b/drivers/net/wireless/rt2x00/rt2500usb.c
@@ -324,8 +324,6 @@
 	u16 reg;
 
 	if (flags & CONFIG_UPDATE_TYPE) {
-		rt2500usb_register_write(rt2x00dev, TXRX_CSR19, 0);
-
 		/*
 		 * Enable beacon config
 		 */
@@ -344,10 +342,6 @@
 		rt2500usb_register_write(rt2x00dev, TXRX_CSR18, reg);
 
 		rt2500usb_register_read(rt2x00dev, TXRX_CSR19, &reg);
-		rt2x00_set_field16(&reg, TXRX_CSR19_TSF_COUNT, 1);
-		rt2x00_set_field16(&reg, TXRX_CSR19_TBCN,
-				   (conf->sync == TSF_SYNC_BEACON));
-		rt2x00_set_field16(&reg, TXRX_CSR19_BEACON_GEN, 0);
 		rt2x00_set_field16(&reg, TXRX_CSR19_TSF_SYNC, conf->sync);
 		rt2500usb_register_write(rt2x00dev, TXRX_CSR19, reg);
 	}
@@ -1092,6 +1086,8 @@
 
 	rt2500usb_register_read(rt2x00dev, TXRX_CSR19, &reg);
 	if (!rt2x00_get_field16(reg, TXRX_CSR19_BEACON_GEN)) {
+		rt2x00_set_field16(&reg, TXRX_CSR19_TSF_COUNT, 1);
+		rt2x00_set_field16(&reg, TXRX_CSR19_TBCN, 1);
 		rt2x00_set_field16(&reg, TXRX_CSR19_BEACON_GEN, 1);
 		/*
 		 * Beacon generation will fail initially.
@@ -1740,6 +1736,7 @@
 	struct skb_frame_desc *skbdesc;
 	int pipe = usb_sndbulkpipe(usb_dev, 1);
 	int length;
+	u16 reg;
 
 	if (unlikely(!intf->beacon))
 		return -ENOBUFS;
@@ -1765,6 +1762,16 @@
 	skbdesc->entry = intf->beacon;
 
 	/*
+	 * Disable beaconing while we are reloading the beacon data,
+	 * otherwise we might be sending out invalid data.
+	 */
+	rt2500usb_register_read(rt2x00dev, TXRX_CSR19, &reg);
+	rt2x00_set_field16(&reg, TXRX_CSR19_TSF_COUNT, 0);
+	rt2x00_set_field16(&reg, TXRX_CSR19_TBCN, 0);
+	rt2x00_set_field16(&reg, TXRX_CSR19_BEACON_GEN, 0);
+	rt2500usb_register_write(rt2x00dev, TXRX_CSR19, reg);
+
+	/*
 	 * mac80211 doesn't provide the control->queue variable
 	 * for beacons. Set our own queue identification so
 	 * it can be used during descriptor initialization.