USB: ch341: fix TIOCMIWAIT and disconnect
Use tty-port modem-status-change wait queue on which processes are woken
up at hangup and disconnect.
Currently a process waiting on modem-status changes will not be woken on
device disconnect as wake up was only done in dtr_rts which isn't
guaranteed to be called (e.g. if HUPCL is not set).
Also remove the redundant wake-up call from dtr_rts.
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/usb/serial/ch341.c b/drivers/usb/serial/ch341.c
index 1a97985..c2a4171 100644
--- a/drivers/usb/serial/ch341.c
+++ b/drivers/usb/serial/ch341.c
@@ -296,7 +296,6 @@
priv->line_control &= ~(CH341_BIT_RTS | CH341_BIT_DTR);
spin_unlock_irqrestore(&priv->lock, flags);
ch341_set_handshake(port->serial->dev, priv->line_control);
- wake_up_interruptible(&port->delta_msr_wait);
}
static void ch341_close(struct usb_serial_port *port)
@@ -489,7 +488,7 @@
tty_kref_put(tty);
}
- wake_up_interruptible(&port->delta_msr_wait);
+ wake_up_interruptible(&port->port.delta_msr_wait);
}
exit:
@@ -516,7 +515,7 @@
spin_unlock_irqrestore(&priv->lock, flags);
while (!multi_change) {
- interruptible_sleep_on(&port->delta_msr_wait);
+ interruptible_sleep_on(&port->port.delta_msr_wait);
/* see if a signal did it */
if (signal_pending(current))
return -ERESTARTSYS;
