vcs: invoke the vt update callback when /dev/vcs* is written to

[mirror_ubuntu-bionic-kernel.git] / drivers / char / vt.c

diff --git a/drivers/char/vt.c b/drivers/char/vt.c
index 50590c7f2c01ac4c2a71595e94fbebe930081079..a8ec48ed14d939ce8baf505bd670518b062e3912 100644 (file)
--- a/drivers/char/vt.c
+++ b/drivers/char/vt.c
@@ -906,22 +906,16 @@ static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
                         * bottom of buffer
                         */
                        old_origin += (old_rows - new_rows) * old_row_size;
-                       end = vc->vc_scr_end;
                } else {
                        /*
                         * Cursor is in no man's land, copy 1/2 screenful
                         * from the top and bottom of cursor position
                         */
                        old_origin += (vc->vc_y - new_rows/2) * old_row_size;
-                       end = old_origin + (old_row_size * new_rows);
                }
-       } else
-               /*
-                * Cursor near the top, copy contents from the top of buffer
-                */
-               end = (old_rows > new_rows) ? old_origin +
-                       (old_row_size * new_rows) :
-                       vc->vc_scr_end;
+       }
+
+       end = old_origin + old_row_size * min(old_rows, new_rows);
 
        update_attr(vc);
 
@@ -3075,8 +3069,7 @@ static int bind_con_driver(const struct consw *csw, int first, int last,
 
                old_was_color = vc->vc_can_do_color;
                vc->vc_sw->con_deinit(vc);
-               if (!vc->vc_origin)
-                       vc->vc_origin = (unsigned long)vc->vc_screenbuf;
+               vc->vc_origin = (unsigned long)vc->vc_screenbuf;
                visual_init(vc, i, 0);
                set_origin(vc);
                update_attr(vc);
@@ -4189,6 +4182,11 @@ void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
        }
 }
 
+void vcs_scr_updated(struct vc_data *vc)
+{
+       notify_update(vc);
+}
+
 /*
  *     Visible symbols for modules
  */