diff options
| author | Johan Hovold <jhovold@gmail.com> | 2014-01-02 22:49:22 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-01-03 12:42:23 -0800 |
| commit | dbfd2866ac36bab52a4f37384e935eb5df76ad60 (patch) | |
| tree | 50773ae33e25b196fae42530fd0afc8db908423f | |
| parent | 6020c3bec359873c1e4081785f220db99694c4e4 (diff) | |
| download | linux-dbfd2866ac36bab52a4f37384e935eb5df76ad60.tar.bz2 | |
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>
| -rw-r--r-- | drivers/usb/serial/pl2303.c | 17 |
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); } } |