xhci: Add xhci_reset_halted_ep() helper function

Create a separate helper function to issue reset endpont commands
to clear halted endpoints.

This is useful for cases where a halted endpoint is discovered while
completing another command, and the endpoint halt needs to be cleared
with a endpoint reset first.

No functional changes
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20210129130044.206855-16-mathias.nyman@linux.intel.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/xhci-ring.c

@@ -749,6 +749,26 @@ static void xhci_unmap_td_bounce_buffer(struct xhci_hcd *xhci,
 	seg->bounce_offs = 0;
 }
 
+static int xhci_reset_halted_ep(struct xhci_hcd *xhci, unsigned int slot_id,
+				unsigned int ep_index, enum xhci_ep_reset_type reset_type)
+{
+	struct xhci_command *command;
+	int ret = 0;
+
+	command = xhci_alloc_command(xhci, false, GFP_ATOMIC);
+	if (!command) {
+		ret = -ENOMEM;
+		goto done;
+	}
+
+	ret = xhci_queue_reset_ep(xhci, command, slot_id, ep_index, reset_type);
+done:
+	if (ret)
+		xhci_err(xhci, "ERROR queuing reset endpoint for slot %d ep_index %d, %d\n",
+			 slot_id, ep_index, ret);
+	return ret;
+}
+
 /*
  * When we get a command completion for a Stop Endpoint Command, we need to
  * unlink any cancelled TDs from the ring.  There are two ways to do that:
@@ -1907,8 +1927,9 @@ static void xhci_cleanup_halted_endpoint(struct xhci_hcd *xhci,
 				struct xhci_td *td,
 				enum xhci_ep_reset_type reset_type)
 {
-	struct xhci_command *command;
 	unsigned int slot_id = ep->vdev->slot_id;
+	int err;
+
 	/*
 	 * Avoid resetting endpoint if link is inactive. Can cause host hang.
 	 * Device will be reset soon to recover the link so don't do anything
@@ -1916,13 +1937,11 @@ static void xhci_cleanup_halted_endpoint(struct xhci_hcd *xhci,
 	if (ep->vdev->flags & VDEV_PORT_ERROR)
 		return;
 
-	command = xhci_alloc_command(xhci, false, GFP_ATOMIC);
-	if (!command)
-		return;
-
 	ep->ep_state |= EP_HALTED;
 
-	xhci_queue_reset_ep(xhci, command, slot_id, ep->ep_index, reset_type);
+	err = xhci_reset_halted_ep(xhci, slot_id, ep->ep_index, reset_type);
+	if (err)
+		return;
 
 	if (reset_type == EP_HARD_RESET) {
 		ep->ep_state |= EP_HARD_CLEAR_TOGGLE;