USB: serial: clean up dtr_rts
Since commit 957dacae ("TTY: fix DTR not being dropped on hang up")
dtr_rts is no longer called for uninitialised ports (e.g. after
a disconnect), which removes the need to grab the disconnect mutex.
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index cb27fcb..6091bd5 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -681,20 +681,10 @@
static void serial_port_dtr_rts(struct tty_port *port, int on)
{
struct usb_serial_port *p = container_of(port, struct usb_serial_port, port);
- struct usb_serial *serial = p->serial;
- struct usb_serial_driver *drv = serial->type;
+ struct usb_serial_driver *drv = p->serial->type;
- if (!drv->dtr_rts)
- return;
- /*
- * Work-around bug in the tty-layer which can result in dtr_rts
- * being called after a disconnect (and tty_unregister_device
- * has returned). Remove once bug has been squashed.
- */
- mutex_lock(&serial->disc_mutex);
- if (!serial->disconnected)
+ if (drv->dtr_rts)
drv->dtr_rts(p, on);
- mutex_unlock(&serial->disc_mutex);
}
static const struct tty_port_operations serial_port_ops = {