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| author | Alan Cox <alan@linux.intel.com> | 2009-11-30 14:17:14 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-12-12 00:18:07 +0100 |
| commit | 568aafc627e2978509e8a80c640ba534d1e843cc (patch) | |
| tree | 1a24c5c0fc3a56054fa054a0255c04e5b7848daa /drivers/char/tty_port.c | |
| parent | tty: istallion: tty port open/close methods (diff) | |
| download | linux-568aafc627e2978509e8a80c640ba534d1e843cc.tar.xz linux-568aafc627e2978509e8a80c640ba534d1e843cc.zip | |
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 <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/char/tty_port.c')
| -rw-r--r-- | drivers/char/tty_port.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/char/tty_port.c b/drivers/char/tty_port.c index 84006de2900f..be492dd66437 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 |