linux-kernel - Re: [PATCH] HID: roccat: Fixing race condition on initialization

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Date:	Sat, 28 Aug 2010 20:18:17 +0200
From:	Jiri Slaby <jirislaby@...il.com>
To:	erazor_de@...rs.sourceforge.net
CC:	Jiri Kosina <jkosina@...e.cz>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Tejun Heo <tj@...nel.org>, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] HID: roccat: Fixing race condition on initialization

On 08/28/2010 02:57 PM, Stefan Achatz wrote:
> Fixed raced condition where event occurs before drvdata is set.
> 
> Signed-off-by: Stefan Achatz <erazor_de@...rs.sourceforge.net>
> ---
>  drivers/hid/hid-roccat-kone.c |    4 ++++
>  1 files changed, 4 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/hid/hid-roccat-kone.c b/drivers/hid/hid-roccat-kone.c
> index f776957..cfeab56 100644
> --- a/drivers/hid/hid-roccat-kone.c
> +++ b/drivers/hid/hid-roccat-kone.c
> @@ -966,6 +966,10 @@ static int kone_raw_event(struct hid_device *hdev, struct hid_report *report,
>  	struct kone_device *kone = hid_get_drvdata(hdev);
>  	struct kone_mouse_event *event = (struct kone_mouse_event *)data;
>  
> +	/* possible race condition on initialization */
> +	if (!kone)
> +		return 0;

This kind of "protection" caused much headache in the tty layer in the
past. If there is such a problem, please fix the initialization code
instead.

What sort of problems you are seeing?

thanks,
-- 
js
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