diff --git a/drivers/net/wireless/libertas/dev.h b/drivers/net/wireless/libertas/dev.h
index fe5045757356af1b2ba4f3287ab4dfe0c5fadab9..1c6ec4d619888b2aa425fadd504b9e1e76772312 100644
--- a/drivers/net/wireless/libertas/dev.h
+++ b/drivers/net/wireless/libertas/dev.h
@@ -260,6 +260,7 @@ struct lbs_private {
 	u16 psmode;		/* Wlan802_11PowermodeCAM=disable
 				   Wlan802_11PowermodeMAX_PSP=enable */
 	u32 psstate;
+	char ps_supported;
 	u8 needtowakeup;
 
 	struct PS_CMD_ConfirmSleep lbs_ps_confirm_sleep;
diff --git a/drivers/net/wireless/libertas/host.h b/drivers/net/wireless/libertas/host.h
index 4c03e12fd6a3415318ad160bea0aad2d0ce55bba..1aa04076b1ac72379d14fb46567a174800bed9bc 100644
--- a/drivers/net/wireless/libertas/host.h
+++ b/drivers/net/wireless/libertas/host.h
@@ -209,6 +209,11 @@
 #define	CMD_TYPE_MAX_PSP		0x0001
 #define CMD_TYPE_FAST_PSP		0x0002
 
+/* Options for CMD_802_11_FW_WAKE_METHOD */
+#define CMD_WAKE_METHOD_UNCHANGED	0x0000
+#define CMD_WAKE_METHOD_COMMAND_INT	0x0001
+#define CMD_WAKE_METHOD_GPIO		0x0002
+
 /* Define action or option for CMD_BT_ACCESS */
 enum cmd_bt_access_opts {
 	/* The bt commands start at 5 instead of 1 because the old dft commands
diff --git a/drivers/net/wireless/libertas/wext.c b/drivers/net/wireless/libertas/wext.c
index b1e24723f2f9f9b83fbed281d04ec82f75d8a099..3e8d555ba3a97bc0d2de00f4ef47a5c6dafda124 100644
--- a/drivers/net/wireless/libertas/wext.c
+++ b/drivers/net/wireless/libertas/wext.c
@@ -734,6 +734,13 @@ static int lbs_set_power(struct net_device *dev, struct iw_request_info *info,
 
 	lbs_deb_enter(LBS_DEB_WEXT);
 
+	if (!priv->ps_supported) {
+		if (vwrq->disabled)
+			return 0;
+		else
+			return -EINVAL;
+	}
+
 	/* PS is currently supported only in Infrastructure mode
 	 * Remove this check if it is to be supported in IBSS mode also
 	 */