diff options
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/tty.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/tty.h b/include/linux/tty.h index e3612c3..b6e6c26 100644 --- 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); |