linux-kernel - Re: [PATCH] input: joystick: Adding Austria Microsystem AS5011 joystick driver (third version)

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Date:	Fri, 07 Jan 2011 20:55:36 +0100
From:	Fabien Marteau <fabien.marteau@...adeus.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
CC:	Trilok Soni <tsoni@...eaurora.org>,
	Scott Moreau <oreaus@...il.com>, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] input: joystick:   Adding Austria Microsystem AS5011
 joystick driver (third version)

On 07/01/2011 20:50, Dmitry Torokhov wrote:
> On Fri, Jan 07, 2011 at 08:42:37PM +0100, Fabien Marteau wrote:
>> On 04/01/2011 12:01, Trilok Soni wrote:
>>> Hi Fabien,
>>>
>>> On 1/4/2011 3:17 PM, Fabien Marteau wrote:
>>>> +
>>>> +static irqreturn_t as5011_int_interrupt(int irq, void *dev_id)
>>>> +{
>>>> +	struct as5011_platform_data *plat_dat = dev_id;
>>>> +
>>>> +	mutex_lock(&plat_dat->update_lock);
>>>> +	as5011_update_axes(plat_dat);
>>>> +	mutex_unlock(&plat_dat->update_lock);
>>>
>>> Please explain this lock. Sorry if I have missed out your explanation in the earlier threads.
>>
>> If a second interruption occurs the first update must be finished before update again.
> 
> The ISR handler will not be called simultaneously on several CPUs. What
> else can it race with?
> 
Hum in fact nothing I thinks. I will delete it.

Thanks
Fabien
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