s390/raw3270: add raw3270_start_request() helper

There are a few places (and there would be more with the following commits)
like this:

raw3270_request_reset(cp->kreset);
raw3270_request_set_cmd(cp->kreset, TC_WRITE);
raw3270_request_add_data(cp->kreset, &kreset_data, 1);
raw3270_start(&cp->view, cp->kreset);

i.e reset a request, setting the command, adding payload, and starting the
request. Add a helper raw3270_start_request() which takes a command and
the payload as argument and calls the approppriate functions.
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Tested-by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

drivers/s390/char/con3270.c

@@ -591,10 +591,7 @@ static void tty3270_read_tasklet(unsigned long data)
 	spin_unlock_irq(&tp->view.lock);
 
 	/* Start keyboard reset command. */
-	raw3270_request_reset(tp->kreset);
-	raw3270_request_set_cmd(tp->kreset, TC_WRITE);
-	raw3270_request_add_data(tp->kreset, &kreset_data, 1);
-	raw3270_start(&tp->view, tp->kreset);
+	raw3270_start_request(&tp->view, tp->kreset, TC_WRITE, &kreset_data, 1);
 
 	while (len-- > 0)
 		kbd_keycode(tp->kbd, *input++);

drivers/s390/char/raw3270.c

@@ -264,6 +264,19 @@ int raw3270_start(struct raw3270_view *view, struct raw3270_request *rq)
 	return rc;
 }
 
+int raw3270_start_request(struct raw3270_view *view, struct raw3270_request *rq,
+			  int cmd, void *data, size_t len)
+{
+	int rc;
+
+	raw3270_request_reset(rq);
+	raw3270_request_set_cmd(rq, cmd);
+	rc = raw3270_request_add_data(rq, data, len);
+	if (rc)
+		return rc;
+	return raw3270_start(view, rq);
+}
+
 int raw3270_start_locked(struct raw3270_view *view, struct raw3270_request *rq)
 {
 	struct raw3270 *rp;
@@ -1272,6 +1285,7 @@ EXPORT_SYMBOL(raw3270_find_view);
 EXPORT_SYMBOL(raw3270_activate_view);
 EXPORT_SYMBOL(raw3270_deactivate_view);
 EXPORT_SYMBOL(raw3270_start);
+EXPORT_SYMBOL(raw3270_start_request);
 EXPORT_SYMBOL(raw3270_start_locked);
 EXPORT_SYMBOL(raw3270_start_irq);
 EXPORT_SYMBOL(raw3270_reset);

drivers/s390/char/raw3270.h

@@ -180,6 +180,8 @@ int raw3270_start_irq(struct raw3270_view *, struct raw3270_request *);
 int raw3270_reset(struct raw3270_view *);
 struct raw3270_view *raw3270_view(struct raw3270_view *);
 int raw3270_view_active(struct raw3270_view *);
+int raw3270_start_request(struct raw3270_view *view, struct raw3270_request *rq,
+			  int cmd, void *data, size_t len);
 
 /* Reference count inliner for view structures. */
 static inline void