Use the common USB helpers for looking up bulk and interrupt endpoints
(and determining endpoint numbers and max packet sizes) instead of open
coding.

Signed-off-by: Johan Hovold <johan@kernel.org>
---
 drivers/net/can/usb/ucan.c | 40 +++++++++++---------------------------
 1 file changed, 11 insertions(+), 29 deletions(-)

diff --git a/drivers/net/can/usb/ucan.c b/drivers/net/can/usb/ucan.c
index ee3c1abbd063..f72e0644c5fd 100644
--- a/drivers/net/can/usb/ucan.c
+++ b/drivers/net/can/usb/ucan.c
@@ -1302,13 +1302,12 @@ static int ucan_probe(struct usb_interface *intf,
 		      const struct usb_device_id *id)
 {
 	int ret;
-	int i;
 	u32 protocol_version;
 	struct usb_device *udev;
 	struct net_device *netdev;
 	struct usb_host_interface *iface_desc;
 	struct ucan_priv *up;
-	struct usb_endpoint_descriptor *ep;
+	struct usb_endpoint_descriptor *ep_in, *ep_out;
 	u16 in_ep_size;
 	u16 out_ep_size;
 	u8 in_ep_addr;
@@ -1343,37 +1342,20 @@ static int ucan_probe(struct usb_interface *intf,
 	}
 
 	/* check interface endpoints */
-	in_ep_addr = 0;
-	out_ep_addr = 0;
-	in_ep_size = 0;
-	out_ep_size = 0;
-	for (i = 0; i < iface_desc->desc.bNumEndpoints; i++) {
-		ep = &iface_desc->endpoint[i].desc;
-
-		if (((ep->bEndpointAddress & USB_ENDPOINT_DIR_MASK) != 0) &&
-		    ((ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
-		     USB_ENDPOINT_XFER_BULK)) {
-			/* In Endpoint */
-			in_ep_addr = ep->bEndpointAddress;
-			in_ep_addr &= USB_ENDPOINT_NUMBER_MASK;
-			in_ep_size = le16_to_cpu(ep->wMaxPacketSize);
-		} else if (((ep->bEndpointAddress & USB_ENDPOINT_DIR_MASK) ==
-			    0) &&
-			   ((ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
-			    USB_ENDPOINT_XFER_BULK)) {
-			/* Out Endpoint */
-			out_ep_addr = ep->bEndpointAddress;
-			out_ep_addr &= USB_ENDPOINT_NUMBER_MASK;
-			out_ep_size = le16_to_cpu(ep->wMaxPacketSize);
-		}
-	}
-
-	/* check if interface is sane */
-	if (!in_ep_addr || !out_ep_addr) {
+	ret = usb_find_common_endpoints_reverse(iface_desc, &ep_in, &ep_out,
+						NULL, NULL);
+	if (ret) {
 		dev_err(&udev->dev, "%s: invalid endpoint configuration\n",
 			UCAN_DRIVER_NAME);
 		goto err_firmware_needs_update;
 	}
+
+	in_ep_addr = usb_endpoint_num(ep_in);
+	out_ep_addr = usb_endpoint_num(ep_out);
+	in_ep_size = usb_endpoint_maxp(ep_in);
+	out_ep_size = usb_endpoint_maxp(ep_out);
+
+	/* check if interface is sane */
 	if (in_ep_size < sizeof(struct ucan_message_in)) {
 		dev_err(&udev->dev, "%s: invalid in_ep MaxPacketSize\n",
 			UCAN_DRIVER_NAME);
-- 
2.52.0