ath5k: fix missing output in monitor mode after ifconfig up

Let ath5k_chan_set() always call ath5k_reset().
This fixes the bug that we don't
get any packets in monitor mode after:

ifconfig wlan0 down
iwconfig wlan0 mode monitor channel 1
ifconfig wlan0 up

but they arrive after

iwconfig wlan0 channel 2
Signed-off-by: Joerg Albert <jal2@gmx.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath5k/base.c

@@ -1071,10 +1071,9 @@ ath5k_setup_bands(struct ieee80211_hw *hw)
 }
 
 /*
- * Set/change channels.  If the channel is really being changed,
- * it's done by reseting the chip.  To accomplish this we must
- * first cleanup any pending DMA, then restart stuff after a la
- * ath5k_init.
+ * Set/change channels. We always reset the chip.
+ * To accomplish this we must first cleanup any pending DMA,
+ * then restart stuff after a la  ath5k_init.
  *
  * Called with sc->lock.
  */
@@ -1084,9 +1083,6 @@ ath5k_chan_set(struct ath5k_softc *sc, struct ieee80211_channel *chan)
 	ATH5K_DBG(sc, ATH5K_DEBUG_RESET, "(%u MHz) -> (%u MHz)\n",
 		sc->curchan->center_freq, chan->center_freq);
 
-	if (chan->center_freq != sc->curchan->center_freq ||
-		chan->hw_value != sc->curchan->hw_value) {
-
 	/*
 	 * To switch channels clear any pending DMA operations;
 	 * wait long enough for the RX fifo to drain, reset the
@@ -1094,9 +1090,6 @@ ath5k_chan_set(struct ath5k_softc *sc, struct ieee80211_channel *chan)
 	 * the relevant bits of the h/w.
 	 */
 	return ath5k_reset(sc, chan);
-	}
-
-	return 0;
 }
 
 static void
@@ -2811,9 +2804,11 @@ ath5k_config(struct ieee80211_hw *hw, u32 changed)
 
 	mutex_lock(&sc->lock);
 
+	if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
 		ret = ath5k_chan_set(sc, conf->channel);
 		if (ret < 0)
 			goto unlock;
+	}
 
 	if ((changed & IEEE80211_CONF_CHANGE_POWER) &&
 	(sc->power_level != conf->power_level)) {