linux-kernel - Re: [PATCH] serial: Add CONSOLE

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Date:	Tue, 10 Aug 2010 06:48:26 -0500
From:	Jason Wessel <jason.wessel@...driver.com>
To:	Michal Simek <monstr@...str.eu>
CC:	jacmet@...site.dk, grant.likely@...retlab.ca,
	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
	KGDB Mailing List <kgdb-bugreport@...ts.sourceforge.net>
Subject: Re: [PATCH] serial: Add CONSOLE_POLL support for uartlite

On 08/09/2010 05:07 AM, Michal Simek wrote:
> CONSOLE_POLL support for uartlite enables
> KGDB debugging over serial line.
> 
> Signed-off-by: Michal Simek <monstr@...str.eu>
> ---
>  drivers/serial/uartlite.c |   26 +++++++++++++++++++++++++-
>  1 files changed, 25 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/serial/uartlite.c b/drivers/serial/uartlite.c
> index caf085d..ce1f3e0 100644
> --- a/drivers/serial/uartlite.c
> +++ b/drivers/serial/uartlite.c
> @@ -322,6 +322,26 @@ static int ulite_verify_port(struct uart_port *port, struct serial_struct *ser)
>  	return -EINVAL;
>  }
>  
> +#ifdef CONFIG_CONSOLE_POLL
> +static int ulite_get_poll_char(struct uart_port *port)
> +{
> +	while (!(ioread32be(port->membase + ULITE_STATUS)
> +						& ULITE_STATUS_RXVALID))
> +		cpu_relax();
> +
> +	return ioread32be(port->membase + ULITE_RX);
> +}



After kdb was merged, the CONSOLE_POLL API had a subtle change where
all I/O drivers should return immediately with a return of
NO_POLL_CHAR in order to allow more than one I/O driver to operate in
the same poll loop.


The patch should look like the following for the get_poll_char.

+static int ulite_get_poll_char(struct uart_port *port)
+{
+	if (!(ioread32be(port->membase + ULITE_STATUS)
+	    & ULITE_STATUS_RXVALID))
+		return NO_POLL_CHAR;
+
+	return ioread32be(port->membase + ULITE_RX);
+}


If you agree to the change you can add my SOB.

Signed-off-by: Jason Wessel <jason.wessel@...driver.com>

Cheers,
Jason.

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