s390/con3270: generate status line during output

Updating the status line is almost the same as generating
it when redrawing the screen. However, the code is much easier
to read when doing so.
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

@@ -87,9 +87,9 @@ struct tty3270 {
 	int nr_lines;			/* # lines in list. */
 	int nr_up;			/* # lines up in history. */
 	unsigned long update_flags;	/* Update indication bits. */
-	struct string *status;		/* Lower right of display. */
 	struct raw3270_request *write;	/* Single write request. */
 	struct timer_list timer;	/* Output delay timer. */
+	char *converted_line;		/* RAW 3270 data stream */
 
 	/* Current tty screen. */
 	unsigned int cx, cy;		/* Current output position. */
@@ -177,6 +177,13 @@ static char *tty3270_add_ge(struct tty3270 *tp, char *cp, char c)
 	return cp;
 }
 
+static char *tty3270_add_sf(struct tty3270 *tp, char *cp, char type)
+{
+	*cp++ = TO_SF;
+	*cp++ = type;
+	return cp;
+}
+
 /*
  * The input line are the two last lines of the screen.
  */
@@ -232,35 +239,28 @@ static void tty3270_create_prompt(struct tty3270 *tp)
  */
 static void tty3270_update_status(struct tty3270 *tp)
 {
-	char *str;
-
-	str = (tp->nr_up != 0) ? "History" : "Running";
-	memcpy(tp->status->string + 8, str, 7);
-	codepage_convert(tp->view.ascebc, tp->status->string + 8, 7);
 	tp->update_flags |= TTY_UPDATE_STATUS;
+	tty3270_set_timer(tp, 1);
 }
 
 /*
  * The status line is the last line of the screen. It shows the string
  * "Running"/"Holding" in the lower right corner of the screen.
  */
-static void tty3270_create_status(struct tty3270 * tp)
+static int tty3270_add_status(struct tty3270 *tp)
 {
-	static const unsigned char blueprint[] = {
-		TO_SBA, 0, 0, TO_SF, TF_LOG, TO_SA, TAT_FGCOLOR, TAC_GREEN,
-		0, 0, 0, 0, 0, 0, 0, TO_SF, TF_LOG, TO_SA, TAT_FGCOLOR,
-		TAC_RESET
-	};
-	struct string *line;
-	unsigned int offset;
+	char *cp = tp->converted_line;
+	int len;
 
-	line = alloc_string(&tp->freemem,sizeof(blueprint));
-	tp->status = line;
-	/* Copy blueprint to status line */
-	memcpy(line->string, blueprint, sizeof(blueprint));
-	/* Set address to start of status string (= last 9 characters). */
-	offset = tp->view.cols * tp->view.rows - 9;
-	raw3270_buffer_address(tp->view.dev, line->string + 1, -9, -1);
+	cp = tty3270_add_ba(tp, cp, TO_SBA, -9, -1);
+	cp = tty3270_add_sf(tp, cp, TF_LOG);
+	cp = tty3270_add_sa(tp, cp, TAT_FGCOLOR, TAC_GREEN);
+	len = sprintf(cp, tp->nr_up ? "History" : "Running");
+	codepage_convert(tp->view.ascebc, cp, len);
+	cp += len;
+	cp = tty3270_add_sf(tp, cp, TF_LOG);
+	cp = tty3270_add_sa(tp, cp, TAT_FGCOLOR, TAC_RESET);
+	return cp - (char *)tp->converted_line;
 }
 
 /*
@@ -589,7 +589,6 @@ static void tty3270_update(struct timer_list *t)
 	updated = 0;
 	if (tp->update_flags & TTY_UPDATE_ALL) {
 		tty3270_rebuild_update(tp);
-		tty3270_update_status(tp);
 		tp->update_flags = TTY_UPDATE_ERASE | TTY_UPDATE_LIST |
 			TTY_UPDATE_INPUT | TTY_UPDATE_STATUS;
 	}
@@ -606,10 +605,11 @@ static void tty3270_update(struct timer_list *t)
 	/*
 	 * Update status line.
 	 */
-	if (tp->update_flags & TTY_UPDATE_STATUS)
-		if (raw3270_request_add_data(wrq, tp->status->string,
-					     tp->status->len) == 0)
+	if (tp->update_flags & TTY_UPDATE_STATUS) {
+		len = tty3270_add_status(tp);
+		if (raw3270_request_add_data(wrq, tp->converted_line, len) == 0)
 			updated |= TTY_UPDATE_STATUS;
+	}
 
 	/*
 	 * Write input line.
@@ -729,7 +729,7 @@ static void tty3270_scroll_forward(struct kbd_data *kbd)
 	if (nr_up != tp->nr_up) {
 		tp->nr_up = nr_up;
 		tty3270_rebuild_update(tp);
-		tty3270_update_status(tp);
+		tp->update_flags |= TTY_UPDATE_STATUS;
 		tty3270_set_timer(tp, 1);
 	}
 	spin_unlock_irq(&tp->view.lock);
@@ -751,7 +751,6 @@ static void tty3270_scroll_backward(struct kbd_data *kbd)
 		tp->nr_up = nr_up;
 		tty3270_rebuild_update(tp);
 		tty3270_update_status(tp);
-		tty3270_set_timer(tp, 1);
 	}
 	spin_unlock_irq(&tp->view.lock);
 }
@@ -1081,9 +1080,7 @@ static void tty3270_resize(struct raw3270_view *view,
 	tp->view.model = new_model;
 
 	free_string(&tp->freemem, tp->prompt);
-	free_string(&tp->freemem, tp->status);
 	tty3270_create_prompt(tp);
-	tty3270_create_status(tp);
 	while (tp->nr_lines < tty3270_tty_rows(tp))
 		tty3270_blank_line(tp);
 	tp->update_flags = TTY_UPDATE_ALL;
@@ -1126,6 +1123,7 @@ static void tty3270_free(struct raw3270_view *view)
 
 	del_timer_sync(&tp->timer);
 	tty3270_free_screen(tp->screen, tp->allocated_lines);
+	free_page((unsigned long)tp->converted_line);
 	tty3270_free_view(tp);
 }
 
@@ -1169,24 +1167,23 @@ tty3270_create_view(int index, struct tty3270 **newtp)
 	rc = raw3270_add_view(&tp->view, &tty3270_fn,
 			      index + RAW3270_FIRSTMINOR,
 			      RAW3270_VIEW_LOCK_IRQ);
-	if (rc) {
-		tty3270_free_view(tp);
-		return rc;
-	}
+	if (rc)
+		goto out_free_view;
 
 	tp->screen = tty3270_alloc_screen(tp, tp->view.rows, tp->view.cols,
 					  &tp->allocated_lines);
 	if (IS_ERR(tp->screen)) {
 		rc = PTR_ERR(tp->screen);
-		raw3270_put_view(&tp->view);
-		raw3270_del_view(&tp->view);
-		tty3270_free_view(tp);
-		return rc;
+		goto out_put_view;
+	}
+
+	tp->converted_line = (void *)__get_free_page(GFP_KERNEL);
+	if (!tp->converted_line) {
+		rc = -ENOMEM;
+		goto out_free_screen;
 	}
 
 	tty3270_create_prompt(tp);
-	tty3270_create_status(tp);
-	tty3270_update_status(tp);
 
 	/* Create blank line for every line in the tty output area. */
 	for (i = 0; i < tty3270_tty_rows(tp); i++)
@@ -1203,6 +1200,15 @@ tty3270_create_view(int index, struct tty3270 **newtp)
 	raw3270_put_view(&tp->view);
 	*newtp = tp;
 	return 0;
+
+out_free_screen:
+	tty3270_free_screen(tp->screen, tp->view.rows);
+out_put_view:
+	raw3270_put_view(&tp->view);
+	raw3270_del_view(&tp->view);
+out_free_view:
+	tty3270_free_view(tp);
+	return rc;
 }
 
 /*