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vt: Fix secure clear screen

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commit 0930b0950a upstream.

\E[3J console code (secure clear screen) needs to update_screen(vc)
in order to write-through blanks into off-screen video memory.

This has been removed accidentally in 3.6 by:

commit 81732c3b2f
Author: Jean-François Moine <moinejf@free.fr>
Date:   Thu Sep 6 19:24:13 2012 +0200

    tty vt: Fix line garbage in virtual console on command line edition

Signed-off-by: Petr Písař <petr.pisar@atlas.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Petr Písař 2014-02-06 21:01:23 +01:00 committed by Greg Kroah-Hartman
parent 41ce42d424
commit 27f0831c1a
1 changed files with 2 additions and 0 deletions
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2
drivers/tty/vt/vt.c
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@ -1164,6 +1164,8 @@ static void csi_J(struct vc_data *vc, int vpar)
scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
vc->vc_screenbuf_size >> 1);
set_origin(vc);
if (CON_IS_VISIBLE(vc))
update_screen(vc);
/* fall through */
case 2: /* erase whole display */
count = vc->vc_cols * vc->vc_rows;