3.6.11.6 stable review patch. If anyone has any objections, please let me know. ------------------ From: Johan Hovold <jhovold@xxxxxxxxx> [ Upstream commit b16634adce951a7371be931487034f7365971ed0 ] Use the new generic usb-serial wait_until_sent implementation to wait for hardware buffers to drain. This removes the need to check the hardware buffers in chars_in_buffer and thus removes the overhead introduced by commit 263e1f9f ("USB: io_ti: query hardware-buffer status in chars_in_buffer") without breaking tty_wait_until_sent (used by, for example, tcdrain, tcsendbreak and close). Signed-off-by: Johan Hovold <jhovold@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx> --- drivers/usb/serial/io_ti.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/drivers/usb/serial/io_ti.c b/drivers/usb/serial/io_ti.c index d2b6008..93cf729 100644 --- a/drivers/usb/serial/io_ti.c +++ b/drivers/usb/serial/io_ti.c @@ -2163,6 +2163,18 @@ static int edge_chars_in_buffer(struct tty_struct *tty) return chars; } +static bool edge_tx_empty(struct usb_serial_port *port) +{ + struct edgeport_port *edge_port = usb_get_serial_port_data(port); + int ret; + + ret = tx_active(edge_port); + if (ret > 0) + return false; + + return true; +} + static void edge_throttle(struct tty_struct *tty) { struct usb_serial_port *port = tty->driver_data; @@ -2739,6 +2751,7 @@ static struct usb_serial_driver edgeport_1port_device = { .write = edge_write, .write_room = edge_write_room, .chars_in_buffer = edge_chars_in_buffer, + .tx_empty = edge_tx_empty, .break_ctl = edge_break, .read_int_callback = edge_interrupt_callback, .read_bulk_callback = edge_bulk_in_callback, @@ -2770,6 +2783,7 @@ static struct usb_serial_driver edgeport_2port_device = { .write = edge_write, .write_room = edge_write_room, .chars_in_buffer = edge_chars_in_buffer, + .tx_empty = edge_tx_empty, .break_ctl = edge_break, .read_int_callback = edge_interrupt_callback, .read_bulk_callback = edge_bulk_in_callback, -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html