p54: Fix potential concurrent access to private data

Experience with the rtl8187 driver has shown that mac80211 can make
calls to the config callback routine in rapid succession. This patch
creates a mutex that protects the private data in several of the routines
called by mac80211.

Signed-off-by: Larry Finger <[e-mail]>
Signed-off-by: John W. Linville <[e-mail]>

drivers/net/wireless/p54/p54.h

···
 	int (*open)(struct ieee80211_hw *dev);
 	void (*stop)(struct ieee80211_hw *dev);
 	int mode;
+	struct mutex conf_mutex;
 	u8 mac_addr[ETH_ALEN];
 	u8 bssid[ETH_ALEN];
 	struct pda_iq_autocal_entry *iq_autocal;

drivers/net/wireless/p54/p54common.c

···
 static int p54_config(struct ieee80211_hw *dev, struct ieee80211_conf *conf)
 {
 	int ret;
+	struct p54_common *priv = dev->priv;
 
+	mutex_lock(&priv->conf_mutex);
 	ret = p54_set_freq(dev, cpu_to_le16(conf->channel->center_freq));
 	p54_set_vdcf(dev);
+	mutex_unlock(&priv->conf_mutex);
 	return ret;
 }
 
···
 {
 	struct p54_common *priv = dev->priv;
 
+	mutex_lock(&priv->conf_mutex);
 	p54_set_filter(dev, 0, priv->mac_addr, conf->bssid, 0, 1, 0, 0xF642);
 	p54_set_filter(dev, 0, priv->mac_addr, conf->bssid, 2, 0, 0, 0);
 	p54_set_leds(dev, 1, !is_multicast_ether_addr(conf->bssid), 0);
 	memcpy(priv->bssid, conf->bssid, ETH_ALEN);
+	mutex_unlock(&priv->conf_mutex);
 	return 0;
 }
 
···
 	}
 
 	p54_init_vdcf(dev);
+	mutex_init(&priv->conf_mutex);
 
 	return dev;
 }