linux-kernel - Re: [PATCH v2 -tip][RFC] serial8250: update to dev_pm

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Message-Id: <A64E62CE-DD3A-495F-A745-77588B25E495@gmail.com>
Date:	Sat, 25 Jul 2009 17:52:46 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Erik Ekman <erik@...o.se>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, Frans Pop <elendil@...net.nl>,
	Alan Cox <alan@...ux.intel.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 -tip][RFC] serial8250: update to dev_pm_ops

On Jul 25, 2009, at 1:59 PM, Erik Ekman <erik@...o.se> wrote:

> serial8250: update to dev_pm_ops
>
> From dmesg:
> Platform driver 'serial8250' needs updating - please use dev_pm_ops
>
> Signed-off-by: Erik Ekman <erik@...o.se>
> --
> Updated to handle hibernation as understood based on info from  
> Rafael J. Wysocki.
> Please let me know if any special handling is needed.
>
> diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
> index fb867a9..e93222c 100644
> --- a/drivers/serial/8250.c
> +++ b/drivers/serial/8250.c
> @@ -2982,42 +2982,50 @@ static int __devexit serial8250_remove 
> (struct platform_device *dev)
>    return 0;
> }
>
> -static int serial8250_suspend(struct platform_device *dev,  
> pm_message_t state)
> +static int serial8250_suspend(struct device *dev)
> {
>    int i;
>
>    for (i = 0; i < UART_NR; i++) {
>        struct uart_8250_port *up = &serial8250_ports[i];
>
> -        if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev- 
> >dev)
> +        if (up->port.type != PORT_UNKNOWN && up->port.dev == dev)
>            uart_suspend_port(&serial8250_reg, &up->port);
>    }
>
>    return 0;
> }
>
> -static int serial8250_resume(struct platform_device *dev)
> +static int serial8250_resume(struct device *dev)
> {
>    int i;
>
>    for (i = 0; i < UART_NR; i++) {
>        struct uart_8250_port *up = &serial8250_ports[i];
>
> -        if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev- 
> >dev)
> +        if (up->port.type != PORT_UNKNOWN && up->port.dev == dev)
>            serial8250_resume_port(i);
>    }
>
>    return 0;
> }
>
> +static struct dev_pm_ops serial8250_pm_ops = {
> +    .resume   = serial8250_resume,
> +    .suspend  = serial8250_suspend,
> +    .freeze   = serial8250_resume,
> +    .thaw     = serial8250_suspend,
> +    .restore  = serial8250_resume,
> +    .poweroff = serial8250_suspend,
> +};


Do we really both freeze and poweroff for serial port? I am getting  
wary of these mechanical conversions...

-- 
Dmitry

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