mt76: do not enable/disable pre_tbtt_tasklet in scan_start/scan_complete

Do not enable/disable pre_tbtt_tasklet tasklet in
mt76x02_sw_scan/mt76x02_sw_scan_complete since it is already done
setting the operating channel. Do run tbtt_tasklet while the device is
offchannel
Signed-off-by: NLorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: NFelix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt76x02_mmio.c

@@ -30,6 +30,9 @@ static void mt76x02_pre_tbtt_tasklet(unsigned long arg)
 	struct sk_buff *skb;
 	int i;
 
+	if (mt76_hw(dev)->conf.flags & IEEE80211_CONF_OFFCHANNEL)
+		return;
+
 	mt76x02_resync_beacon_timer(dev);
 
 	ieee80211_iterate_active_interfaces_atomic(mt76_hw(dev),

drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c

@@ -178,6 +178,9 @@ static void mt76x02u_pre_tbtt_work(struct work_struct *work)
 	if (!dev->mt76.beacon_mask)
 		return;
 
+	if (mt76_hw(dev)->conf.flags & IEEE80211_CONF_OFFCHANNEL)
+		return;
+
 	mt76x02_resync_beacon_timer(dev);
 
 	ieee80211_iterate_active_interfaces(mt76_hw(dev),

drivers/net/wireless/mediatek/mt76/mt76x02_util.c

@@ -593,8 +593,6 @@ void mt76x02_sw_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 {
 	struct mt76x02_dev *dev = hw->priv;
 
-	if (mt76_is_mmio(dev))
-		tasklet_disable(&dev->mt76.pre_tbtt_tasklet);
 	set_bit(MT76_SCANNING, &dev->mt76.state);
 }
 EXPORT_SYMBOL_GPL(mt76x02_sw_scan);
@@ -605,9 +603,6 @@ void mt76x02_sw_scan_complete(struct ieee80211_hw *hw,
 	struct mt76x02_dev *dev = hw->priv;
 
 	clear_bit(MT76_SCANNING, &dev->mt76.state);
-	if (mt76_is_mmio(dev))
-		tasklet_enable(&dev->mt76.pre_tbtt_tasklet);
-
 	if (dev->cal.gain_init_done) {
 		/* Restore AGC gain and resume calibration after scanning. */
 		dev->cal.low_gain = -1;