iwlwifi: add internal short scan support for 3945

Add internal short scan support for 3945 NIC, This allows 3945 NIC
to support radio reset request like the other series of NICs.
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>

drivers/net/wireless/iwlwifi/iwl3945-base.c

@@ -2799,7 +2799,6 @@ static void iwl3945_bg_request_scan(struct work_struct *data)
 		.len = sizeof(struct iwl3945_scan_cmd),
 		.flags = CMD_SIZE_HUGE,
 	};
-	int rc = 0;
 	struct iwl3945_scan_cmd *scan;
 	struct ieee80211_conf *conf = NULL;
 	u8 n_probes = 0;
@@ -2827,7 +2826,6 @@ static void iwl3945_bg_request_scan(struct work_struct *data)
 	if (test_bit(STATUS_SCAN_HW, &priv->status)) {
 		IWL_DEBUG_INFO(priv, "Multiple concurrent scan requests  "
 				"Ignoring second request.\n");
-		rc = -EIO;
 		goto done;
 	}
 
@@ -2862,7 +2860,7 @@ static void iwl3945_bg_request_scan(struct work_struct *data)
 		priv->scan = kmalloc(sizeof(struct iwl3945_scan_cmd) +
 				     IWL_MAX_SCAN_SIZE, GFP_KERNEL);
 		if (!priv->scan) {
-			rc = -ENOMEM;
+			IWL_DEBUG_SCAN(priv, "Fail to allocate scan memory\n");
 			goto done;
 		}
 	}
@@ -2905,7 +2903,9 @@ static void iwl3945_bg_request_scan(struct work_struct *data)
 			       scan_suspend_time, interval);
 	}
 
-	if (priv->scan_request->n_ssids) {
+	if (priv->is_internal_short_scan) {
+		IWL_DEBUG_SCAN(priv, "Start internal passive scan.\n");
+	} else if (priv->scan_request->n_ssids) {
 		int i, p = 0;
 		IWL_DEBUG_SCAN(priv, "Kicking off active scan\n");
 		for (i = 0; i < priv->scan_request->n_ssids; i++) {
@@ -2952,13 +2952,20 @@ static void iwl3945_bg_request_scan(struct work_struct *data)
 		goto done;
 	}
 
-	scan->tx_cmd.len = cpu_to_le16(
+	if (!priv->is_internal_short_scan) {
+		scan->tx_cmd.len = cpu_to_le16(
 			iwl_fill_probe_req(priv,
 				(struct ieee80211_mgmt *)scan->data,
 				priv->scan_request->ie,
 				priv->scan_request->ie_len,
 				IWL_MAX_SCAN_SIZE - sizeof(*scan)));
-
+	} else {
+		scan->tx_cmd.len = cpu_to_le16(
+			iwl_fill_probe_req(priv,
+				(struct ieee80211_mgmt *)scan->data,
+				NULL, 0,
+				IWL_MAX_SCAN_SIZE - sizeof(*scan)));
+	}
 	/* select Rx antennas */
 	scan->flags |= iwl3945_get_antenna_flags(priv);
 
@@ -2980,8 +2987,7 @@ static void iwl3945_bg_request_scan(struct work_struct *data)
 	scan->len = cpu_to_le16(cmd.len);
 
 	set_bit(STATUS_SCAN_HW, &priv->status);
-	rc = iwl_send_cmd_sync(priv, &cmd);
-	if (rc)
+	if (iwl_send_cmd_sync(priv, &cmd))
 		goto done;
 
 	queue_delayed_work(priv->workqueue, &priv->scan_check,