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USB: ch341: only wake up MSR queue on changes
author
Johan Hovold
<jhovold@gmail.com>
Thu, 2 Jan 2014 21:49:31 +0000
(22:49 +0100)
committer
Greg Kroah-Hartman
<gregkh@linuxfoundation.org>
Fri, 3 Jan 2014 20:42:24 +0000
(12:42 -0800)
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>
drivers/usb/serial/ch341.c
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diff --git
a/drivers/usb/serial/ch341.c
b/drivers/usb/serial/ch341.c
index 025b7857a36c33b56e7def9bfd0a0a62aff06915..acc88650ac0ac7350d2a8758c9fa0aaf9374fcf8 100644
(file)
--- 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) {
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