mt76usb: allow mt76u_bulk_msg be used for reads

Extend mt76u_bulk_msg() such it can be used for synchronous bulk reads.
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt76.h

@@ -729,16 +729,20 @@ static inline u8 q2ep(u8 qid)
 }
 
 static inline int
-mt76u_bulk_msg(struct mt76_dev *dev, void *data, int len, int timeout)
+mt76u_bulk_msg(struct mt76_dev *dev, void *data, int len, int *actual_len,
+	       int timeout)
 {
 	struct usb_interface *intf = to_usb_interface(dev->dev);
 	struct usb_device *udev = interface_to_usbdev(intf);
 	struct mt76_usb *usb = &dev->usb;
 	unsigned int pipe;
-	int sent;
 
-	pipe = usb_sndbulkpipe(udev, usb->out_ep[MT_EP_OUT_INBAND_CMD]);
-	return usb_bulk_msg(udev, pipe, data, len, &sent, timeout);
+	if (actual_len)
+		pipe = usb_rcvbulkpipe(udev, usb->in_ep[MT_EP_IN_CMD_RESP]);
+	else
+		pipe = usb_sndbulkpipe(udev, usb->out_ep[MT_EP_OUT_INBAND_CMD]);
+
+	return usb_bulk_msg(udev, pipe, data, len, actual_len, timeout);
 }
 
 int mt76u_vendor_request(struct mt76_dev *dev, u8 req,

drivers/net/wireless/mediatek/mt76/mt76x02_usb_mcu.c

@@ -126,7 +126,7 @@ __mt76x02u_mcu_send_msg(struct mt76_dev *dev, struct sk_buff *skb,
 	if (ret)
 		return ret;
 
-	ret = mt76u_bulk_msg(dev, skb->data, skb->len, 500);
+	ret = mt76u_bulk_msg(dev, skb->data, skb->len, NULL, 500);
 	if (ret)
 		return ret;
 
@@ -271,7 +271,7 @@ __mt76x02u_mcu_fw_send_data(struct mt76x02_dev *dev, u8 *data,
 
 	data_len = MT_CMD_HDR_LEN + len + sizeof(info);
 
-	err = mt76u_bulk_msg(&dev->mt76, data, data_len, 1000);
+	err = mt76u_bulk_msg(&dev->mt76, data, data_len, NULL, 1000);
 	if (err) {
 		dev_err(dev->mt76.dev, "firmware upload failed: %d\n", err);
 		return err;