On Sun, Jun 26, 2005 at 11:17:50PM +0100, Russell King wrote:
> Fix bugme #4712: read the CTS status and set hw_stopped if CTS
> is not active.
>
> Thanks to Stefan Wolff for spotting this problem.
Stefan Wolff pointed out that this wasn't quite correct. Here's an
updated patch.
Index: drivers/serial/serial_core.c
===================================================================
--- 61f26f0bd348c6ddac8b3b1105e00fa790ea3ea6/drivers/serial/serial_core.c (mode:100644)
+++ uncommitted/drivers/serial/serial_core.c (mode:100644)
@@ -182,6 +182,13 @@
uart_set_mctrl(port, TIOCM_RTS | TIOCM_DTR);
}
+ if (info->flags & UIF_CTS_FLOW) {
+ spin_lock_irq(&port->lock);
+ if (!(port->ops->get_mctrl(port) & TIOCM_CTS))
+ info->tty->hw_stopped = 1;
+ spin_unlock_irq(&port->lock);
+ }
+
info->flags |= UIF_INITIALIZED;
clear_bit(TTY_IO_ERROR, &info->tty->flags);
@@ -1134,6 +1141,16 @@
spin_unlock_irqrestore(&state->port->lock, flags);
}
+ /* Handle turning on CRTSCTS */
+ if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) {
+ spin_lock_irqsave(&state->port->lock, flags);
+ if (!(state->port->ops->get_mctrl(state->port) & TIOCM_CTS)) {
+ tty->hw_stopped = 1;
+ state->port->ops->stop_tx(state->port, 0);
+ }
+ spin_unlock_irqrestore(&state->port->lock, flags);
+ }
+
#if 0
/*
* No need to wake up processes in open wait, since they
--
Russell King
Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/
maintainer of: 2.6 Serial core
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