Disconnecting a device is not just a hang up. The device is gone. We should tell user space the truth immediately. Signed-off-by: Oliver Neukum <oneukum@xxxxxxxx> --- drivers/usb/serial/generic.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c index 54e170d..147696d 100644 --- a/drivers/usb/serial/generic.c +++ b/drivers/usb/serial/generic.c @@ -505,6 +505,10 @@ int usb_serial_generic_tiocmiwait(struct tty_struct *tty, unsigned long arg) usb_serial_generic_msr_changed(tty, arg, &cnow)); if (!ret && !test_bit(ASYNCB_INITIALIZED, &port->port.flags)) ret = -EIO; + mutex_lock(&port->serial->disc_mutex); + if (port->serial->disconnected) + ret = -ENODEV; + mutex_unlock(&port->serial->disc_mutex); return ret; } -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
