[rt2x00-users] [RFC/RFT 03/15] rt2x00: Limit beacon updates in bss_info_changed to USB devices

[Helmut Schaa]

Currently there are two places that trigger a beacon update on PCI
devices. The bss_info_changed callback and the periodic update
triggered by the TBTT or PRETBTT interrupt.

Since the next TBTT or PRETBTT interrupt will periodically fetch an
updated beacon remove the update_beacon call in the bss_info_changed
callback for PCI devices.

In the worst case it will take one beacon interval longer to fetch
the new beacon then before. For devices that have a PRETBTT interrupt
there should be no change at all.

Signed-off-by: Helmut Schaa <helmut.schaa at googlemail.com>
---
 drivers/net/wireless/rt2x00/rt2x00mac.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/rt2x00/rt2x00mac.c b/drivers/net/wireless/rt2x00/rt2x00mac.c
index 5c7e4e5..62b248e 100644
--- a/drivers/net/wireless/rt2x00/rt2x00mac.c
+++ b/drivers/net/wireless/rt2x00/rt2x00mac.c
@@ -636,9 +636,10 @@ void rt2x00mac_bss_info_changed(struct ieee80211_hw *hw,
 				      bss_conf->bssid);
 
 	/*
-	 * Update the beacon.
+	 * Update the beacon. This is only required on USB devices. PCI
+	 * devices fetch beacons periodically.
 	 */
-	if (changes & BSS_CHANGED_BEACON)
+	if (changes & BSS_CHANGED_BEACON && rt2x00_is_usb(rt2x00dev))
 		rt2x00queue_update_beacon(rt2x00dev, vif);
 
 	/*
-- 
1.7.1