mt76x2: init: disable all pending tasklets during device removal

There is a possible race in mt76x2_stop_hardware() since pre_tbtt and
dfs tasklets could run during driver cleanup. Fix it disabling all
pending tasklets during device removal

Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
Acked-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/mediatek/mt76/mt76x2_init.c

@@ -614,6 +614,8 @@ void mt76x2_stop_hardware(struct mt76x2_dev *dev)
 
 void mt76x2_cleanup(struct mt76x2_dev *dev)
 {
+	tasklet_disable(&dev->dfs_pd.dfs_tasklet);
+	tasklet_disable(&dev->pre_tbtt_tasklet);
 	mt76x2_stop_hardware(dev);
 	mt76x2_dma_cleanup(dev);
 	mt76x2_mcu_cleanup(dev);