diff options
| author | Johan Hovold <jhovold@gmail.com> | 2013-03-21 12:36:53 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-03-25 13:50:51 -0700 |
| commit | c371de14b9a23aadb57accab0ca2e5dd28de7f16 (patch) | |
| tree | aec827c692f6574509ca8eb7a00278e4926d7cc4 | |
| parent | 980373b7918b8023be6b7df03857f494ae124d0b (diff) | |
USB: serial: wake up MSR-wait queue on disconnect
Make sure processes waiting for modem-status changes are woken up at
disconnect.
This is needed for custom subdriver TIOCMIWAIT-implementations which do
not yet handle hangup.
Even though processes on the tty-port wait queue are woken up at hangup
the wake-up call in usb-serial disconnect is still needed if a woken-up
process may go back to sleep (e.g. due to an incomplete
TIOCMIWAIT-implementation). If a disconnect occurs after a hangup, any
process waiting for changes will not be woken up a second time by the
tty-layer as the port will then have been disassociated from the tty.
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/usb/serial/usb-serial.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c index ada400d6594..45688162072 100644 --- a/drivers/usb/serial/usb-serial.c +++ b/drivers/usb/serial/usb-serial.c @@ -1093,6 +1093,7 @@ static void usb_serial_disconnect(struct usb_interface *interface) tty_kref_put(tty); } usb_serial_port_poison_urbs(port); + wake_up_interruptible(&port->port.delta_msr_wait); cancel_work_sync(&port->work); if (device_is_registered(&port->dev)) device_del(&port->dev); |