From 568aafc627e2978509e8a80c640ba534d1e843cc Mon Sep 17 00:00:00 2001 From: Alan Cox Date: Mon, 30 Nov 2009 13:17:14 +0000 Subject: tty: tty_port: Add a kref object to the tty port Users of tty port need a way to refcount ports when hotplugging is involved. Signed-off-by: Alan Cox Signed-off-by: Greg Kroah-Hartman --- drivers/char/tty_port.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) (limited to 'drivers/char') diff --git a/drivers/char/tty_port.c b/drivers/char/tty_port.c index 84006de..be492dd 100644 --- a/drivers/char/tty_port.c +++ b/drivers/char/tty_port.c @@ -29,6 +29,7 @@ void tty_port_init(struct tty_port *port) spin_lock_init(&port->lock); port->close_delay = (50 * HZ) / 100; port->closing_wait = (3000 * HZ) / 100; + kref_init(&port->kref); } EXPORT_SYMBOL(tty_port_init); @@ -56,6 +57,23 @@ void tty_port_free_xmit_buf(struct tty_port *port) } EXPORT_SYMBOL(tty_port_free_xmit_buf); +static void tty_port_destructor(struct kref *kref) +{ + struct tty_port *port = container_of(kref, struct tty_port, kref); + if (port->xmit_buf) + free_page((unsigned long)port->xmit_buf); + if (port->ops->destruct) + port->ops->destruct(port); + else + kfree(port); +} + +void tty_port_put(struct tty_port *port) +{ + if (port) + kref_put(&port->kref, tty_port_destructor); +} +EXPORT_SYMBOL(tty_port_put); /** * tty_port_tty_get - get a tty reference -- cgit v1.1