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USB: ch341: only wake up MSR queue on changes 

Only wake up MSR wait queue on actual modem-status changes.

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
Johan Hovold 2014-01-02 22:49:31 +01:00 committed by Greg Kroah-Hartman
parent fd74b0b144
commit d984fe91a8
1 changed files with 3 additions and 0 deletions
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3
drivers/usb/serial/ch341.c
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@ -460,6 +460,9 @@ static void ch341_update_line_status(struct usb_serial_port *port,
if (data[1] & CH341_MULT_STAT)
dev_dbg(&port->dev, "%s - multiple status change\n", __func__);
if (!delta)
return;
if (delta & CH341_BIT_DCD) {
tty = tty_port_tty_get(&port->port);
if (tty) {