linux-kernel - Re: [PATCHv2 2/5] driver: serial: omap: prevent runtime PM for "no_console

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Message-ID: <20130422143136.GB7508@arwen.pp.htv.fi>
Date:	Mon, 22 Apr 2013 17:31:36 +0300
From:	Felipe Balbi <balbi@...com>
To:	Sourav Poddar <sourav.poddar@...com>
CC:	<gregkh@...uxfoundation.org>, <tony@...mide.com>,
	<rmk+kernel@....linux.org.uk>, <khilman@...aro.org>,
	<linux-serial@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv2 2/5] driver: serial: omap: prevent runtime PM for
 "no_console_suspend"

Hi,

On Mon, Apr 22, 2013 at 07:13:54PM +0530, Sourav Poddar wrote:
> The driver manages "no_console_suspend" by preventing runtime PM
> during the suspend path, which forces the console UART to stay awake.
> 
> Signed-off-by: Sourav Poddar <sourav.poddar@...com>
> ---
>  drivers/tty/serial/omap-serial.c |    5 ++++-
>  1 files changed, 4 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
> index 08332f3..640b14e 100644
> --- a/drivers/tty/serial/omap-serial.c
> +++ b/drivers/tty/serial/omap-serial.c
> @@ -1582,7 +1582,7 @@ static int serial_omap_runtime_suspend(struct device *dev)
>  	struct uart_omap_port *up = dev_get_drvdata(dev);
>  	struct omap_uart_port_info *pdata = dev->platform_data;
>  
> -	if (!up)
> +	if (!up || (!console_suspend_enabled && uart_console(&up->port)))
>  		return -EINVAL;

-EBUSY would be a better value for uart_console case, so this check
should be splitted accordingly. Likewise on second hunk.

-- 
balbi

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