b43(legacy): include full timestamp in beacon frames

Having the full RX timestamp in beacons is necessary for IBSS
merge to work properly so extend the 16-bit timestamp to the
full 64 bits for beacon frames (as well as when monitor mode
is active.)

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Michael Buesch <mb@bu3sch.de>
Signed-off-by: Stefano Brivio <stefano.brivio@polimi.it>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 9 insertions, 5 deletions

diff --git a/drivers/net/wireless/b43legacy/xmit.c b/drivers/net/wireless/b43legacy/xmit.c
index 47e130e9fdf2..dcad2491a606 100644
--- a/drivers/net/wireless/b43legacy/xmit.c
+++ b/drivers/net/wireless/b43legacy/xmit.c
@@ -546,12 +546,16 @@ void b43legacy_rx(struct b43legacy_wldev *dev,
         status.antenna = !!(phystat0 & B43legacy_RX_PHYST0_ANT);
 
         /*
-         * If monitors are present get full 64-bit timestamp. This
-         * code assumes we get to process the packet within 16 bits
-         * of timestamp, i.e. about 65 milliseconds after the PHY
-         * received the first symbol.
+         * All frames on monitor interfaces and beacons always need a full
+         * 64-bit timestamp. Monitor interfaces need it for diagnostic
+         * purposes and beacons for IBSS merging.
+         * This code assumes we get to process the packet within 16 bits
+         * of timestamp, i.e. about 65 milliseconds after the PHY received
+         * the first symbol.
          */
-        if (dev->wl->radiotap_enabled) {
+        if (((fctl & (IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE))
+            == (IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON)) ||
+            dev->wl->radiotap_enabled) {
                 u16 low_mactime_now;
 
                 b43legacy_tsf_read(dev, &status.mactime);