diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index 0cfbb7182b5a..b3dd44802208 100644
--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -4590,7 +4590,7 @@ static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
 {
 	int con = op->height;
 	int rc;
-
+	static void *LAST;
 
 	console_lock();
 	if (vc->vc_mode != KD_TEXT)
@@ -4601,8 +4601,14 @@ static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
 		rc = -ENOTTY;
 	else if (con == vc->vc_num)	/* nothing to do */
 		rc = 0;
-	else
+	else {
+		if (LAST != vc->vc_sw) {
+			pr_warn("con_font_copy(): vc_sw=%pS, vc_sw->con_font_copy=%pS\n",
+				vc->vc_sw, vc->vc_sw->con_font_copy);
+			LAST = vc->vc_sw;
+		}
 		rc = vc->vc_sw->con_font_copy(vc, con);
+	}
 	console_unlock();
 	return rc;
 }