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authorJohan Hovold <jhovold@gmail.com>2014-01-03 01:49:22 +0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-01-04 00:42:23 +0400
commitdbfd2866ac36bab52a4f37384e935eb5df76ad60 (patch)
tree50773ae33e25b196fae42530fd0afc8db908423f /drivers
parent6020c3bec359873c1e4081785f220db99694c4e4 (diff)
downloadlinux-dbfd2866ac36bab52a4f37384e935eb5df76ad60.tar.xz
USB: pl2303: 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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/usb/serial/pl2303.c17
1 files changed, 10 insertions, 7 deletions
diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
index 11de1f169308..64f093f16981 100644
--- a/drivers/usb/serial/pl2303.c
+++ b/drivers/usb/serial/pl2303.c
@@ -118,6 +118,7 @@ MODULE_DEVICE_TABLE(usb, id_table);
#define VENDOR_READ_REQUEST 0x01
#define UART_STATE_INDEX 8
+#define UART_STATE_MSR_MASK 0x8b
#define UART_STATE_TRANSIENT_MASK 0x74
#define UART_DCD 0x01
#define UART_DSR 0x02
@@ -828,15 +829,17 @@ static void pl2303_update_line_status(struct usb_serial_port *port,
if (status & UART_BREAK_ERROR)
usb_serial_handle_break(port);
- wake_up_interruptible(&port->port.delta_msr_wait);
-
- if (delta & UART_DCD) {
- tty = tty_port_tty_get(&port->port);
- if (tty) {
- usb_serial_handle_dcd_change(port, tty,
+ if (delta & UART_STATE_MSR_MASK) {
+ if (delta & UART_DCD) {
+ tty = tty_port_tty_get(&port->port);
+ if (tty) {
+ usb_serial_handle_dcd_change(port, tty,
status & UART_DCD);
- tty_kref_put(tty);
+ tty_kref_put(tty);
+ }
}
+
+ wake_up_interruptible(&port->port.delta_msr_wait);
}
}