prism54: Convert stats_sem in a mutex

The semaphore stats_sem is used as mutex, convert it to the mutex API
Signed-off-by: Matthias Kaehlcke <matthias@kaehlcke.net>
Acked-by: Luis R. Rodriguez <mcgrof@winlab.rutgers.edu>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/prism54/isl_ioctl.c

@@ -165,7 +165,7 @@ prism54_update_stats(struct work_struct *work)
 	struct obj_bss bss, *bss2;
 	union oid_res_t r;
 
-	down(&priv->stats_sem);
+	mutex_lock(&priv->stats_lock);
 
 /* Noise floor.
  * I'm not sure if the unit is dBm.
@@ -207,7 +207,7 @@ prism54_update_stats(struct work_struct *work)
 	mgt_get_request(priv, DOT11_OID_MPDUTXFAILED, 0, NULL, &r);
 	priv->local_iwstatistics.discard.retries = r.u;
 
-	up(&priv->stats_sem);
+	mutex_unlock(&priv->stats_lock);
 
 	return;
 }
@@ -218,12 +218,12 @@ prism54_get_wireless_stats(struct net_device *ndev)
 	islpci_private *priv = netdev_priv(ndev);
 
 	/* If the stats are being updated return old data */
-	if (down_trylock(&priv->stats_sem) == 0) {
+	if (mutex_trylock(&priv->stats_lock) == 0) {
 		memcpy(&priv->iwstatistics, &priv->local_iwstatistics,
 		       sizeof (struct iw_statistics));
 		/* They won't be marked updated for the next time */
 		priv->local_iwstatistics.qual.updated = 0;
-		up(&priv->stats_sem);
+		mutex_unlock(&priv->stats_lock);
 	} else
 		priv->iwstatistics.qual.updated = 0;
 

drivers/net/wireless/prism54/islpci_dev.c

@@ -864,7 +864,7 @@ islpci_setup(struct pci_dev *pdev)
 	mutex_init(&priv->mgmt_lock);
 	priv->mgmt_received = NULL;
 	init_waitqueue_head(&priv->mgmt_wqueue);
-	sema_init(&priv->stats_sem, 1);
+	mutex_init(&priv->stats_lock);
 	spin_lock_init(&priv->slock);
 
 	/* init state machine with off#1 state */

drivers/net/wireless/prism54/islpci_dev.h

@@ -88,7 +88,7 @@ typedef struct {
 
 	/* Take care of the wireless stats */
 	struct work_struct stats_work;
-	struct semaphore stats_sem;
+	struct mutex stats_lock;
 	/* remember when we last updated the stats */
 	unsigned long stats_timestamp;
 	/* The first is accessed under semaphore locking.