1 files changed, 19 insertions, 1 deletions

diff --git a/drivers/char/vt.c b/drivers/char/vt.c
index c3f8e383933b..0fefe2a28055 100644
--- a/drivers/char/vt.c
+++ b/drivers/char/vt.c
@@ -2185,10 +2185,28 @@ static void console_callback(struct work_struct *ignored)
         release_console_sem();
 }
 
-void set_console(int nr)
+int set_console(int nr)
 {
+        struct vc_data *vc = vc_cons[fg_console].d;
+
+        if (!vc_cons_allocated(nr) || vt_dont_switch ||
+                (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
+
+                /*
+                 * Console switch will fail in console_callback() or
+                 * change_console() so there is no point scheduling
+                 * the callback
+                 *
+                 * Existing set_console() users don't check the return
+                 * value so this shouldn't break anything
+                 */
+                return -EINVAL;
+        }
+
         want_console = nr;
         schedule_console_callback();
+
+        return 0;
 }
 
 struct tty_driver *console_driver;