diff --git a/drivers/net/wireless/prism54/isl_ioctl.c b/drivers/net/wireless/prism54/isl_ioctl.c
index 3fb6a7b5403..2d91a56d6a3 100644
--- a/drivers/net/wireless/prism54/isl_ioctl.c
+++ b/drivers/net/wireless/prism54/isl_ioctl.c
@@ -2114,7 +2114,7 @@ prism54_wpa_bss_ie_add(islpci_private *priv, u8 *bssid,
 	if (wpa_ie_len > MAX_WPA_IE_LEN)
 		wpa_ie_len = MAX_WPA_IE_LEN;
 
-	down(&priv->wpa_sem);
+	mutex_lock(&priv->wpa_lock);
 
 	/* try to use existing entry */
 	list_for_each(ptr, &priv->bss_wpa_list) {
@@ -2165,7 +2165,7 @@ prism54_wpa_bss_ie_add(islpci_private *priv, u8 *bssid,
 		kfree(bss);
 	}
 
-	up(&priv->wpa_sem);
+	mutex_unlock(&priv->wpa_lock);
 }
 
 static size_t
@@ -2175,7 +2175,7 @@ prism54_wpa_bss_ie_get(islpci_private *priv, u8 *bssid, u8 *wpa_ie)
 	struct islpci_bss_wpa_ie *bss = NULL;
 	size_t len = 0;
 
-	down(&priv->wpa_sem);
+	mutex_lock(&priv->wpa_lock);
 
 	list_for_each(ptr, &priv->bss_wpa_list) {
 		bss = list_entry(ptr, struct islpci_bss_wpa_ie, list);
@@ -2187,7 +2187,7 @@ prism54_wpa_bss_ie_get(islpci_private *priv, u8 *bssid, u8 *wpa_ie)
 		len = bss->wpa_ie_len;
 		memcpy(wpa_ie, bss->wpa_ie, len);
 	}
-	up(&priv->wpa_sem);
+	mutex_unlock(&priv->wpa_lock);
 
 	return len;
 }
@@ -2196,7 +2196,7 @@ void
 prism54_wpa_bss_ie_init(islpci_private *priv)
 {
 	INIT_LIST_HEAD(&priv->bss_wpa_list);
-	sema_init(&priv->wpa_sem, 1);
+	mutex_init(&priv->wpa_lock);
 }
 
 void
diff --git a/drivers/net/wireless/prism54/islpci_dev.h b/drivers/net/wireless/prism54/islpci_dev.h
index 85ddf89967a..8e55a5fcffa 100644
--- a/drivers/net/wireless/prism54/islpci_dev.h
+++ b/drivers/net/wireless/prism54/islpci_dev.h
@@ -178,7 +178,7 @@ typedef struct {
 	int wpa; /* WPA mode enabled */
 	struct list_head bss_wpa_list;
 	int num_bss_wpa;
-	struct semaphore wpa_sem;
+	struct mutex wpa_lock;
 	u8 wpa_ie[MAX_WPA_IE_LEN];
 	size_t wpa_ie_len;