diff options
Diffstat (limited to 'drivers/usb/serial/ch341.c')
| -rw-r--r-- | drivers/usb/serial/ch341.c | 12 |
1 files changed, 4 insertions, 8 deletions
diff --git a/drivers/usb/serial/ch341.c b/drivers/usb/serial/ch341.c index 9dd94a7e08b9..025b7857a36c 100644 --- a/drivers/usb/serial/ch341.c +++ b/drivers/usb/serial/ch341.c @@ -83,7 +83,6 @@ struct ch341_private { unsigned baud_rate; /* set baud rate */ u8 line_control; /* set line control value RTS/DTR */ u8 line_status; /* active status of modem control inputs */ - u8 multi_status_change; /* status changed multiple since last call */ }; static int ch341_control_out(struct usb_device *dev, u8 request, @@ -174,7 +173,6 @@ static int ch341_get_status(struct usb_device *dev, struct ch341_private *priv) r = 0; spin_lock_irqsave(&priv->lock, flags); priv->line_status = (~(*buffer)) & CH341_BITS_MODEM_STAT; - priv->multi_status_change = 0; spin_unlock_irqrestore(&priv->lock, flags); } else r = -EPROTO; @@ -457,10 +455,11 @@ static void ch341_update_line_status(struct usb_serial_port *port, spin_lock_irqsave(&priv->lock, flags); delta = status ^ priv->line_status; priv->line_status = status; - if (data[1] & CH341_MULT_STAT) - priv->multi_status_change = 1; spin_unlock_irqrestore(&priv->lock, flags); + if (data[1] & CH341_MULT_STAT) + dev_dbg(&port->dev, "%s - multiple status change\n", __func__); + if (delta & CH341_BIT_DCD) { tty = tty_port_tty_get(&port->port); if (tty) { @@ -516,14 +515,12 @@ static int ch341_tiocmiwait(struct tty_struct *tty, unsigned long arg) u8 prevstatus; u8 status; u8 changed; - u8 multi_change = 0; spin_lock_irqsave(&priv->lock, flags); prevstatus = priv->line_status; - priv->multi_status_change = 0; spin_unlock_irqrestore(&priv->lock, flags); - while (!multi_change) { + for (;;) { interruptible_sleep_on(&port->port.delta_msr_wait); /* see if a signal did it */ if (signal_pending(current)) @@ -534,7 +531,6 @@ static int ch341_tiocmiwait(struct tty_struct *tty, unsigned long arg) spin_lock_irqsave(&priv->lock, flags); status = priv->line_status; - multi_change = priv->multi_status_change; spin_unlock_irqrestore(&priv->lock, flags); changed = prevstatus ^ status; |