Bluetooth: Submit bulk URBs along with interrupt URBs

Submitting the bulk URBs for ACL data transfers only on demand has no
real benefit compared to just submit them when a Bluetooth device gets
opened. So when submitting the interrupt URBs for HCI events, just
submit the bulk URBs, too.

This solves a problem with some Bluetooth USB dongles that has been
reported over the last few month. These devices require that the bulk
URBs are actually present. These devices are really broken, but there
is nothing we can do about it.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

drivers/bluetooth/btusb.c

@@ -35,7 +35,7 @@
 #include <net/bluetooth/bluetooth.h>
 #include <net/bluetooth/hci_core.h>
 
-#define VERSION "0.4"
+#define VERSION "0.5"
 
 static int ignore_dga;
 static int ignore_csr;
@@ -171,6 +171,7 @@ struct btusb_data {
 
 	__u8 cmdreq_type;
 
+	unsigned int sco_num;
 	int isoc_altsetting;
 	int suspend_count;
 };
@@ -496,11 +497,23 @@ static int btusb_open(struct hci_dev *hdev)
 		return 0;
 
 	err = btusb_submit_intr_urb(hdev, GFP_KERNEL);
+	if (err < 0)
+		goto failed;
+
+	err = btusb_submit_bulk_urb(hdev, GFP_KERNEL);
 	if (err < 0) {
-		clear_bit(BTUSB_INTR_RUNNING, &data->flags);
-		clear_bit(HCI_RUNNING, &hdev->flags);
+		usb_kill_anchored_urbs(&data->intr_anchor);
+		goto failed;
 	}
 
+	set_bit(BTUSB_BULK_RUNNING, &data->flags);
+	btusb_submit_bulk_urb(hdev, GFP_KERNEL);
+
+	return 0;
+
+failed:
+	clear_bit(BTUSB_INTR_RUNNING, &data->flags);
+	clear_bit(HCI_RUNNING, &hdev->flags);
 	return err;
 }
 
@@ -655,19 +668,10 @@ static void btusb_notify(struct hci_dev *hdev, unsigned int evt)
 
 	BT_DBG("%s evt %d", hdev->name, evt);
 
-	if (hdev->conn_hash.acl_num > 0) {
-		if (!test_and_set_bit(BTUSB_BULK_RUNNING, &data->flags)) {
-			if (btusb_submit_bulk_urb(hdev, GFP_ATOMIC) < 0)
-				clear_bit(BTUSB_BULK_RUNNING, &data->flags);
-			else
-				btusb_submit_bulk_urb(hdev, GFP_ATOMIC);
-		}
-	} else {
-		clear_bit(BTUSB_BULK_RUNNING, &data->flags);
-		usb_unlink_anchored_urbs(&data->bulk_anchor);
+	if (hdev->conn_hash.sco_num != data->sco_num) {
+		data->sco_num = hdev->conn_hash.sco_num;
+		schedule_work(&data->work);
 	}
-
-	schedule_work(&data->work);
 }
 
 static int inline __set_isoc_interface(struct hci_dev *hdev, int altsetting)
@@ -982,9 +986,11 @@ static int btusb_resume(struct usb_interface *intf)
 	}
 
 	if (test_bit(BTUSB_BULK_RUNNING, &data->flags)) {
-		if (btusb_submit_bulk_urb(hdev, GFP_NOIO) < 0)
+		err = btusb_submit_bulk_urb(hdev, GFP_NOIO);
+		if (err < 0) {
 			clear_bit(BTUSB_BULK_RUNNING, &data->flags);
-		else
+			return err;
+		} else
 			btusb_submit_bulk_urb(hdev, GFP_NOIO);
 	}