linux-kernel - Re: [PATCH 2/7] serial/8250: move alchemy I/O handler to platform code

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Date:	Tue, 28 Jun 2011 13:29:19 +0200
From:	Manuel Lauss <manuel.lauss@...glemail.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Greg Kroah-Hartman <gregkh@...e.de>, linux-kernel@...r.kernel.org,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Ralf Baechle <ralf@...ux-mips.org>,
	linux-serial@...r.kernel.org
Subject: Re: [PATCH 2/7] serial/8250: move alchemy I/O handler to platform code

On Mon, Jun 27, 2011 at 11:45 PM, Arnd Bergmann <arnd@...db.de> wrote:
> Only one platform ever sets the UPIO_AU iotype, so it's
> cleaner to define the handlers in the code that actually
> requires it, rather than building the same logic into
> every 8250 driver.
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Cc: Ralf Baechle <ralf@...ux-mips.org>
> Cc: Manuel Lauss <manuel.lauss@...glemail.com>
> Cc: Greg Kroah-Hartman <gregkh@...e.de>
> Cc: linux-serial@...r.kernel.org
> ---
>  arch/mips/alchemy/common/platform.c |   50 ++++++++++++++++++++++++++++++
>  drivers/tty/serial/8250.c           |   58 -----------------------------------
>  2 files changed, 50 insertions(+), 58 deletions(-)
>
> diff --git a/arch/mips/alchemy/common/platform.c b/arch/mips/alchemy/common/platform.c
> index 3b2c18b..750441f 100644
> --- a/arch/mips/alchemy/common/platform.c
> +++ b/arch/mips/alchemy/common/platform.c
[...]
> @@ -55,6 +103,8 @@ static void alchemy_8250_pm(struct uart_port *port, unsigned int state,
>                                  UPF_FIXED_TYPE,               \
>                .type           = PORT_16550A,                  \
>                .pm             = alchemy_8250_pm,              \
> +               .serial_in      = au_serial_in,                 \
> +               .serial_out     = au_serial_out                 \
>        }

This is very strange:  Just this part alone (leaving 8250.c intact)
screws everything up.
The assembly for au_serial_in/out is identical in both 8250.o and
arch/mips/alchemy/common/platform.o (renamed the functions here obviously)
I have no idea what's wrong...

Manuel
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