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authorNicolas Pitre <nicolas.pitre@linaro.org>2019-02-11 19:36:41 -0500
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-02-12 10:46:11 +0100
commita6dbe442755999960ca54a9b8ecfd9606be0ea75 (patch)
treec381877f35ba86d3c609e32402ac703a3d82fe87 /drivers/tty/vt
parentc392ed4642050577847cbd7247d0140022b9b703 (diff)
vt: perform safe console erase in the right order
Commit 4b4ecd9cb853 ("vt: Perform safe console erase only once") removed what appeared to be an extra call to scr_memsetw(). This missed the fact that set_origin() must be called before clearing the screen otherwise old screen content gets restored on the screen when using vgacon. Let's fix that by moving all the scrollback handling to flush_scrollback() where it logically belongs, and invoking it before the actual screen clearing in csi_J(), making the code simpler in the end. Reported-by: Matthew Whitehead <tedheadster@gmail.com> Signed-off-by: Nicolas Pitre <nico@linaro.org> Tested-by: Matthew Whitehead <tedheadster@gmail.com> Fixes: 4b4ecd9cb853 ("vt: Perform safe console erase only once") Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/vt')
-rw-r--r--drivers/tty/vt/vt.c15
1 files changed, 7 insertions, 8 deletions
diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index cbf6cb139dcb..d34984aa646d 100644
--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -935,8 +935,11 @@ static void flush_scrollback(struct vc_data *vc)
{
WARN_CONSOLE_UNLOCKED();
+ set_origin(vc);
if (vc->vc_sw->con_flush_scrollback)
vc->vc_sw->con_flush_scrollback(vc);
+ else
+ vc->vc_sw->con_switch(vc);
}
/*
@@ -1505,8 +1508,10 @@ static void csi_J(struct vc_data *vc, int vpar)
count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
start = (unsigned short *)vc->vc_origin;
break;
+ case 3: /* include scrollback */
+ flush_scrollback(vc);
+ /* fallthrough */
case 2: /* erase whole display */
- case 3: /* (and scrollback buffer later) */
vc_uniscr_clear_lines(vc, 0, vc->vc_rows);
count = vc->vc_cols * vc->vc_rows;
start = (unsigned short *)vc->vc_origin;
@@ -1515,13 +1520,7 @@ static void csi_J(struct vc_data *vc, int vpar)
return;
}
scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
- if (vpar == 3) {
- set_origin(vc);
- flush_scrollback(vc);
- if (con_is_visible(vc))
- update_screen(vc);
- } else if (con_should_update(vc))
- do_update_region(vc, (unsigned long) start, count);
+ update_region(vc, (unsigned long) start, count);
vc->vc_need_wrap = 0;
}