[PATCH] bcm43xx: Fix bug in frequency to channel conversion

The frequency to channel routine in bcm43xx requires that the frequency
be in MHz, but that condition is not always met. This patch does the
necessary conversion.
Signed-off-by: Joerg Sommer <joerg@alea.gnuu.de>
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/bcm43xx/bcm43xx_wx.c

@@ -105,18 +105,24 @@ static int bcm43xx_wx_set_channelfreq(struct net_device *net_dev,
 	struct bcm43xx_private *bcm = bcm43xx_priv(net_dev);
 	unsigned long flags;
 	u8 channel;
+	s8 expon;
 	int freq;
 	int err = -EINVAL;
 
 	mutex_lock(&bcm->mutex);
 	spin_lock_irqsave(&bcm->irq_lock, flags);
 
-	if ((data->freq.m >= 0) && (data->freq.m <= 1000)) {
+	if ((data->freq.e == 0) &&
+	    (data->freq.m >= 0) && (data->freq.m <= 1000)) {
 		channel = data->freq.m;
 		freq = bcm43xx_channel_to_freq(bcm, channel);
 	} else {
-		channel = bcm43xx_freq_to_channel(bcm, data->freq.m);
 		freq = data->freq.m;
+		expon = 6 - data->freq.e;
+		while (--expon >= 0)    /* scale down the frequency to MHz */
+			freq /= 10;
+		assert(freq > 1000);
+		channel = bcm43xx_freq_to_channel(bcm, freq);
 	}
 	if (!ieee80211_is_valid_channel(bcm->ieee, channel))
 		goto out_unlock;