VServer 1.9.2 (patch-2.6.8.1-vs1.9.2.diff)

[linux-2.6.git] / kernel / printk.c

diff --git a/kernel/printk.c b/kernel/printk.c
index 3bf268b..9b1f825 100644 (file)
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -687,6 +687,47 @@ void console_unblank(void)
 }
 EXPORT_SYMBOL(console_unblank);
 
+/*
+ * Return the console tty driver structure and its associated index
+ */
+struct tty_driver *console_device(int *index)
+{
+       struct console *c;
+       struct tty_driver *driver = NULL;
+
+       acquire_console_sem();
+       for (c = console_drivers; c != NULL; c = c->next) {
+               if (!c->device)
+                       continue;
+               driver = c->device(c, index);
+               if (driver)
+                       break;
+       }
+       release_console_sem();
+       return driver;
+}
+
+/*
+ * Prevent further output on the passed console device so that (for example)
+ * serial drivers can disable console output before suspending a port, and can
+ * re-enable output afterwards.
+ */
+void console_stop(struct console *console)
+{
+       acquire_console_sem();
+       console->flags &= ~CON_ENABLED;
+       release_console_sem();
+}
+EXPORT_SYMBOL(console_stop);
+
+void console_start(struct console *console)
+{
+       acquire_console_sem();
+       console->flags |= CON_ENABLED;
+       release_console_sem();
+}
+EXPORT_SYMBOL(console_start);
+
 /*
  * The console driver calls this routine during kernel initialization
  * to register the console printing procedure with printk() and to