rt2x00: Limit beacon updates in bss_info_changed to USB devices

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@googlemail.com>
Acked-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>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2x00mac.c b/drivers/net/wireless/rt2x00/rt2x00mac.c
index 7d3316724bb4..6a66021d8f65 100644
--- a/drivers/net/wireless/rt2x00/rt2x00mac.c
+++ b/drivers/net/wireless/rt2x00/rt2x00mac.c
@@ -617,9 +617,10 @@ 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);
 
         /*