> Thanks Alan, where can find these patches ? Relevant one is probably tty_port: If we are opened non blocking we still need to raise the carrier From: Alan Cox <alan@xxxxxxxxxxxxxxx> The tty_port code inherited a bug common to various drivers it was based upon. If the tty is opened O_NONBLOCK we do not wait for the carrier to be raised but we must still raise our modem lines if appropriate. (There is a second question here about whether we should do so if CLOCAL is set but that can wait) Signed-off-by: Alan Cox <alan@xxxxxxxxxxxxxxx> --- drivers/char/tty_port.c | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-) diff --git a/drivers/char/tty_port.c b/drivers/char/tty_port.c index 8e85657..ed05d2a 100644 --- a/drivers/char/tty_port.c +++ b/drivers/char/tty_port.c @@ -243,6 +243,9 @@ int tty_port_block_til_ready(struct tty_port *port, the port has just hung up or is in another error state */ if ((filp->f_flags & O_NONBLOCK) || (tty->flags & (1 << TTY_IO_ERROR))) { + /* Indicate we are open */ + if (tty->termios->c_cflag & CBAUD) + tty_port_raise_dtr_rts(port); port->flags |= ASYNC_NORMAL_ACTIVE; return 0; } -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html