tty: kref the tty driver object

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

diff --git a/include/linux/tty_driver.h b/include/linux/tty_driver.h
index 2c5c35c4656fd7c18b7edcf4419425a7a0de78e6..ba891dd23550d1a593b9d2c6707db23fb83edb4b 100644 (file)
--- a/include/linux/tty_driver.h
+++ b/include/linux/tty_driver.h
@@ -253,6 +253,7 @@ struct tty_operations {
 
 struct tty_driver {
        int     magic;          /* magic number for this structure */
+       struct kref kref;       /* Reference management */
        struct cdev cdev;
        struct module   *owner;
        const char      *driver_name;
@@ -266,7 +267,6 @@ struct tty_driver {
        short   subtype;        /* subtype of tty driver */
        struct ktermios init_termios; /* Initial termios */
        int     flags;          /* tty driver flags */
-       int     refcount;       /* for loadable tty drivers */
        struct proc_dir_entry *proc_entry; /* /proc fs entry */
        struct tty_driver *other; /* only used for the PTY driver */
 
@@ -288,12 +288,19 @@ struct tty_driver {
 
 extern struct list_head tty_drivers;
 
-struct tty_driver *alloc_tty_driver(int lines);
-void put_tty_driver(struct tty_driver *driver);
-void tty_set_operations(struct tty_driver *driver,
+extern struct tty_driver *alloc_tty_driver(int lines);
+extern void put_tty_driver(struct tty_driver *driver);
+extern void tty_set_operations(struct tty_driver *driver,
                        const struct tty_operations *op);
 extern struct tty_driver *tty_find_polling_driver(char *name, int *line);
 
+extern void tty_driver_kref_put(struct tty_driver *driver);
+extern inline struct tty_driver *tty_driver_kref_get(struct tty_driver *d)
+{
+       kref_get(&d->kref);
+       return d;
+}
+
 /* tty driver magic number */
 #define TTY_DRIVER_MAGIC               0x5402