tty: Add a kref count

[linux-2.6-omap-h63xx.git] / include / linux / tty.h

diff --git a/include/linux/tty.h b/include/linux/tty.h
index e3612c3ac194def233aa9be7c10dca0548a631c3..b6e6c26883ee789463eb04f10b6a3424dc9142c5 100644 (file)
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -209,6 +209,7 @@ struct tty_operations;
 
 struct tty_struct {
        int     magic;
+       struct kref kref;
        struct tty_driver *driver;
        const struct tty_operations *ops;
        int index;
@@ -311,6 +312,23 @@ extern int kmsg_redirect;
 extern void console_init(void);
 extern int vcs_init(void);
 
+/**
+ *     tty_kref_get            -       get a tty reference
+ *     @tty: tty device
+ *
+ *     Return a new reference to a tty object. The caller must hold
+ *     sufficient locks/counts to ensure that their existing reference cannot
+ *     go away
+ */
+
+extern inline struct tty_struct *tty_kref_get(struct tty_struct *tty)
+{
+       if (tty)
+               kref_get(&tty->kref);
+       return tty;
+}
+extern void tty_kref_put(struct tty_struct *tty);
+
 extern int tty_paranoia_check(struct tty_struct *tty, struct inode *inode,
                              const char *routine);
 extern char *tty_name(struct tty_struct *tty, char *buf);