linux-kernel - Re: [PATCH] Input: arizona-haptic - convert to use managed input devices

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Date:	Mon, 06 Jul 2015 12:33:06 -0700
From:	Joshua Clayton <stillcompiling@...il.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	linux-input@...r.kernel.org, Mark Brown <broonie@...nel.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Input: arizona-haptic - convert to use managed input devices

Hi,
It seems to me that swapping error for ret buries the functional changes in 
the patch...
would it be better to split them into a second  cleanup patch?
 
On Monday, July 06, 2015 10:38:41 AM Dmitry Torokhov wrote:
> Using managed input device (via devm_input_allocate_device) simplifies
> error handling and driver removal paths and also silences CID# 712569.
> 
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
> ---
>  drivers/input/misc/arizona-haptics.c | 52
> ++++++++++++------------------------ 1 file changed, 17 insertions(+), 35
> deletions(-)
> 
> diff --git a/drivers/input/misc/arizona-haptics.c
> b/drivers/input/misc/arizona-haptics.c index 4dbbed7..54ebef2 100644
> --- a/drivers/input/misc/arizona-haptics.c
> +++ b/drivers/input/misc/arizona-haptics.c
> @@ -152,7 +152,7 @@ static int arizona_haptics_probe(struct platform_device
> *pdev) {
>  	struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
>  	struct arizona_haptics *haptics;
> -	int ret;
> +	int error;
> 
>  	haptics = devm_kzalloc(&pdev->dev, sizeof(*haptics), GFP_KERNEL);
>  	if (!haptics)
> @@ -160,18 +160,18 @@ static int arizona_haptics_probe(struct
> platform_device *pdev)
> 
>  	haptics->arizona = arizona;
> 
> -	ret = regmap_update_bits(arizona->regmap, ARIZONA_HAPTICS_CONTROL_1,
> -				 ARIZONA_HAP_ACT, arizona->pdata.hap_act);
> -	if (ret != 0) {
> +	error = regmap_update_bits(arizona->regmap, ARIZONA_HAPTICS_CONTROL_1,
> +				   ARIZONA_HAP_ACT, arizona->pdata.hap_act);
> +	if (error) {
>  		dev_err(arizona->dev, "Failed to set haptics actuator: %d\n",
> -			ret);
> -		return ret;
> +			error);
> +		return error;
>  	}
> 
>  	INIT_WORK(&haptics->work, arizona_haptics_work);
> 
> -	haptics->input_dev = input_allocate_device();
> -	if (haptics->input_dev == NULL) {
> +	haptics->input_dev = devm_input_allocate_device(&pdev->dev);
> +	if (!haptics->input_dev) {
>  		dev_err(arizona->dev, "Failed to allocate input device\n");
>  		return -ENOMEM;
>  	}
> @@ -183,46 +183,28 @@ static int arizona_haptics_probe(struct
> platform_device *pdev) haptics->input_dev->close = arizona_haptics_close;
>  	__set_bit(FF_RUMBLE, haptics->input_dev->ffbit);
> 
> -	ret = input_ff_create_memless(haptics->input_dev, NULL,
> -				      arizona_haptics_play);
> -	if (ret < 0) {
> +	error = input_ff_create_memless(haptics->input_dev, NULL,
> +					arizona_haptics_play);
> +	if (error) {

This looks OK. No change in behavior. Underlying functions return 0 or a 
negative number.
 
>  		dev_err(arizona->dev, "input_ff_create_memless() failed: %d\n",
> -			ret);
> -		goto err_ialloc;
> +			error);
> +		return error;
>  	}
> 
> -	ret = 	(haptics->input_dev);
> -	if (ret < 0) {
> +	error = input_register_device(haptics->input_dev);
> +	if (error) {

Same here.

...

-- 
~Joshua Clayton
--
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