linux-kernel - Re: [RFC][PATCH 2/2] ACPI video: Don't start video device until its associated input device has been reigstered

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Message-ID: <20120229003915.GA11111@core.coreip.homeip.net>
Date:	Tue, 28 Feb 2012 16:39:15 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Igor Murzov <intergalactic.anonymous@...il.com>
Cc:	Zhang Rui <rui.zhang@...el.com>, Len Brown <lenb@...nel.org>,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Igor Murzov <e-mail@...e.by>,
	"Sergey V." <sftp.mtuci@...il.com>
Subject: Re: [RFC][PATCH 2/2] ACPI video: Don't start video device until its
 associated input device has been reigstered

On Wed, Feb 29, 2012 at 03:55:18AM +0400, Igor Murzov wrote:
> From 202f25d44b1cf871697c88a6a3a8d854674db4d8 Mon Sep 17 00:00:00 2001
> From: Igor Murzov <e-mail@...e.by>
> Date: Mon, 27 Feb 2012 21:57:59 +0400
> Subject: [PATCH 2/2] ACPI video: Don't start video device until its
>  associated input device has been reigstered

> 
> ---
>  drivers/acpi/video.c |   10 ++++++----
>  1 files changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
> index 1bc6370..b9e114c 100644
> --- a/drivers/acpi/video.c
> +++ b/drivers/acpi/video.c
> @@ -1659,9 +1659,6 @@ static int acpi_video_bus_add(struct acpi_device *device)
>  	error = acpi_video_bus_get_devices(video, device);
>  	if (error)
>  		goto err_free_video;
> -	error = acpi_video_bus_start_devices(video);
> -	if (error)
> -		goto err_put_video;
>  
>  	video->input = input = input_allocate_device();
>  	if (!input) {
> @@ -1703,13 +1700,18 @@ static int acpi_video_bus_add(struct acpi_device *device)
>  	if (error)
>  		goto err_free_input_dev;
>  
> +	error = acpi_video_bus_start_devices(video);
> +	if (error)
> +		goto err_unregister_pm_notifier;
> +

Registered input device should be unregistered with
input_unregister_device(), not input_free_device(). Your change breaks
this.

Also, notify() will not be called until acpi_video_bus_add() completes
so current code should be perfectly fine.

>  	return 0;
>  
> + err_unregister_pm_notifier:
> +	unregister_pm_notifier(&video->pm_nb);
>   err_free_input_dev:
>  	input_free_device(input);
>   err_stop_video:
>  	acpi_video_bus_stop_devices(video);
> - err_put_video:
>  	acpi_video_bus_put_devices(video);
>  	kfree(video->attached_array);
>   err_free_video:
> -- 
> 1.7.5.1
> 

Thanks.

-- 
Dmitry
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