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USB: pl2303: only wake up MSR queue on changes

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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>
This commit is contained in:
Johan Hovold 2014-01-02 22:49:22 +01:00 committed by Greg Kroah-Hartman
parent 6020c3bec3
commit dbfd2866ac
1 changed files with 10 additions and 7 deletions
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17
drivers/usb/serial/pl2303.c
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@ -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);
}
}