1 files changed, 26 insertions, 1 deletions

diff --git a/kernel/power/console.c b/kernel/power/console.c
index 89bcf4973ee5..b8628be2a465 100644
--- a/kernel/power/console.c
+++ b/kernel/power/console.c
@@ -7,17 +7,39 @@
 #include <linux/vt_kern.h>
 #include <linux/kbd_kern.h>
 #include <linux/console.h>
+#include <linux/module.h>
 #include "power.h"
 
 #if defined(CONFIG_VT) && defined(CONFIG_VT_CONSOLE)
 #define SUSPEND_CONSOLE (MAX_NR_CONSOLES-1)
 
 static int orig_fgconsole, orig_kmsg;
+static int disable_vt_switch;
+
+/*
+ * Normally during a suspend, we allocate a new console and switch to it.
+ * When we resume, we switch back to the original console.  This switch
+ * can be slow, so on systems where the framebuffer can handle restoration
+ * of video registers anyways, there's little point in doing the console
+ * switch.  This function allows you to disable it by passing it '0'.
+ */
+void pm_set_vt_switch(int do_switch)
+{
+        acquire_console_sem();
+        disable_vt_switch = !do_switch;
+        release_console_sem();
+}
+EXPORT_SYMBOL(pm_set_vt_switch);
 
 int pm_prepare_console(void)
 {
         acquire_console_sem();
 
+        if (disable_vt_switch) {
+                release_console_sem();
+                return 0;
+        }
+
         orig_fgconsole = fg_console;
 
         if (vc_allocate(SUSPEND_CONSOLE)) {
@@ -50,9 +72,12 @@ int pm_prepare_console(void)
 void pm_restore_console(void)
 {
         acquire_console_sem();
+        if (disable_vt_switch) {
+                release_console_sem();
+                return;
+        }
         set_console(orig_fgconsole);
         release_console_sem();
         kmsg_redirect = orig_kmsg;
-        return;
 }
 #endif