Only wake up MSR wait queue on actual modem-status changes.
Signed-off-by: Johan Hovold <[email protected]>
---
drivers/usb/serial/ch341.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/usb/serial/ch341.c b/drivers/usb/serial/ch341.c
index 025b7857a36c..acc88650ac0a 100644
--- a/drivers/usb/serial/ch341.c
+++ b/drivers/usb/serial/ch341.c
@@ -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) {
--
1.8.3.2
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