vt: fix cursor when clearing the screen

The patch a6dbe4427559 ("vt: perform safe console erase in the right
order") introduced a bug. The conditional do_update_region() was
replaced by a call to update_region() that does contain the conditional
already, but with unwanted extra side effects such as restoring the cursor
drawing.

In order to reproduce the bug:
- use framebuffer console with the AMDGPU driver
- type "links" to start the console www browser
- press 'q' and space to exit links

Now the cursor will be permanently visible in the center of the
screen. It will stay there until something overwrites it.

The bug goes away if we change update_region() back to the conditional
do_update_region().

[ nico: reworded changelog ]

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Reviewed-by: Nicolas Pitre <nico@fluxnic.net>
Cc: stable@vger.kernel.org
Fixes: a6dbe4427559 ("vt: perform safe console erase in the right order")
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index d34984aa646dc4d30813fdfb91290fbef958d0fb..650c66886c80f5d1c9770321949251af17e112a6 100644 (file)
--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -1520,7 +1520,8 @@ static void csi_J(struct vc_data *vc, int vpar)
                        return;
        }
        scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
-       update_region(vc, (unsigned long) start, count);
+       if (con_should_update(vc))
+               do_update_region(vc, (unsigned long) start, count);
        vc->vc_need_wrap = 0;
 }