linux-kernel - Re: [PATCH] Input: adp5588-keys: cancel workqueue in failure path

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Date:	Tue, 7 Oct 2014 14:42:40 +0200
From:	Michael Hennerich <michael.hennerich@...log.com>
To:	Pramod Gurav <pramod.gurav@...rtplayin.com>,
	<linux-kernel@...r.kernel.org>
CC:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	<linux-input@...r.kernel.org>
Subject: Re: [PATCH] Input: adp5588-keys: cancel workqueue in failure path

On 10/07/2014 09:30 AM, Pramod Gurav wrote:
> This change introduces a label to call cancel_delayed_work_sync in
> failure path.
>
> Cc: Michael Hennerich <michael.hennerich@...log.com>
> Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>
> Cc: linux-input@...r.kernel.org
> Signed-off-by: Pramod Gurav <pramod.gurav@...rtplayin.com>

The interrupt triggers the work queue. adp5588_setup() enable the HW 
interrupt.
Only if the device was configured before, without being resetb -
The earliest point in time where a problem could happen - is after the 
request_irq().

Anyways patch below doesn't harm and fixes a potential problem.

Acked-by: Michael Hennerich <michael.hennerich@...log.com>

> ---
>   drivers/input/keyboard/adp5588-keys.c |    4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/input/keyboard/adp5588-keys.c b/drivers/input/keyboard/adp5588-keys.c
> index 5ef7fcf..b494062 100644
> --- a/drivers/input/keyboard/adp5588-keys.c
> +++ b/drivers/input/keyboard/adp5588-keys.c
> @@ -559,7 +559,7 @@ static int adp5588_probe(struct i2c_client *client,
>   	error = input_register_device(input);
>   	if (error) {
>   		dev_err(&client->dev, "unable to register input device\n");
> -		goto err_free_mem;
> +		goto err_delayed_work;
>   	}
>   
>   	error = request_irq(client->irq, adp5588_irq,
> @@ -592,6 +592,8 @@ static int adp5588_probe(struct i2c_client *client,
>    err_unreg_dev:
>   	input_unregister_device(input);
>   	input = NULL;
> + err_delayed_work:
> +	cancel_delayed_work_sync(&kpad->work);
>    err_free_mem:
>   	input_free_device(input);
>   	kfree(kpad);


-- 
Greetings,
Michael

--
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