linux-kernel - [PATCH 4.4 80/85] tty: vt, consw->con

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Date:   Tue, 29 Sep 2020 13:00:47 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jiri Slaby <jslaby@...e.cz>,
        Thomas Winischhofer <thomas@...ischhofer.net>,
        linux-usb@...r.kernel.org,
        Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        "James E.J. Bottomley" <jejb@...isc-linux.org>,
        Helge Deller <deller@....de>, linux-fbdev@...r.kernel.org,
        linux-parisc@...r.kernel.org, Ajay Kaher <akaher@...are.com>
Subject: [PATCH 4.4 80/85] tty: vt, consw->con_scrolldelta cleanup

From: Jiri Slaby <jslaby@...e.cz>

commit 97293de977365fe672daec2523e66ef457104921 upstream.

* allow NULL consw->con_scrolldelta (some consoles define an empty
  hook)
* => remove empty hooks now
* return value of consw->con_scrolldelta is never checked => make the
  function void
* document consw->con_scrolldelta a bit

Signed-off-by: Jiri Slaby <jslaby@...e.cz>
Cc: Thomas Winischhofer <thomas@...ischhofer.net>
Cc: linux-usb@...r.kernel.org
Cc: Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>
Cc: Tomi Valkeinen <tomi.valkeinen@...com>
Cc: "James E.J. Bottomley" <jejb@...isc-linux.org>
Cc: Helge Deller <deller@....de>
Cc: linux-fbdev@...r.kernel.org
Cc: linux-parisc@...r.kernel.org
Cc: Ajay Kaher <akaher@...are.com>
[ for 4.4.y backport, only do the first change above, to prevent
.con_scrolldelta from being called if not present - gregkh]
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/tty/vt/vt.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -2484,7 +2484,7 @@ static void console_callback(struct work
 	if (scrollback_delta) {
 		struct vc_data *vc = vc_cons[fg_console].d;
 		clear_selection();
-		if (vc->vc_mode == KD_TEXT)
+		if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
 			vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
 		scrollback_delta = 0;
 	}