xhci: refactor TRB_EVAL_CONTEXT case into function

The function that handles xHCI command completion is much too long and
there is need to be broken up into individual functions for each command
completion to improve code readablity.
This patch refactors the code in TRB_EVAL_CONTEXT switch case in
handle_cmd_completion() into a fuction named xhci_handle_cmd_eval_ctx().
Signed-off-by: Xenia Ragiadakou <burzalodowa@gmail.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>

drivers/usb/host/xhci-ring.c

@@ -1407,6 +1407,18 @@ static void xhci_handle_cmd_disable_slot(struct xhci_hcd *xhci, int slot_id)
 	xhci_free_virt_device(xhci, slot_id);
 }
 
+static void xhci_handle_cmd_eval_ctx(struct xhci_hcd *xhci, int slot_id,
+		struct xhci_event_cmd *event, u32 cmd_comp_code)
+{
+	struct xhci_virt_device *virt_dev;
+
+	virt_dev = xhci->devs[slot_id];
+	if (handle_cmd_in_cmd_wait_list(xhci, virt_dev, event))
+		return;
+	virt_dev->cmd_status = cmd_comp_code;
+	complete(&virt_dev->cmd_completion);
+}
+
 static void xhci_handle_cmd_addr_dev(struct xhci_hcd *xhci, int slot_id,
 		u32 cmd_comp_code)
 {
@@ -1552,11 +1564,8 @@ static void handle_cmd_completion(struct xhci_hcd *xhci,
 		complete(&xhci->devs[slot_id]->cmd_completion);
 		break;
 	case TRB_TYPE(TRB_EVAL_CONTEXT):
-		virt_dev = xhci->devs[slot_id];
-		if (handle_cmd_in_cmd_wait_list(xhci, virt_dev, event))
-			break;
-		xhci->devs[slot_id]->cmd_status = GET_COMP_CODE(le32_to_cpu(event->status));
-		complete(&xhci->devs[slot_id]->cmd_completion);
+		xhci_handle_cmd_eval_ctx(xhci, slot_id, event,
+				GET_COMP_CODE(le32_to_cpu(event->status)));
 		break;
 	case TRB_TYPE(TRB_ADDR_DEV):
 		xhci_handle_cmd_addr_dev(xhci, slot_id,