linux-kernel - Re: [PATCH 13/33] Input: bfin_rotary - Use 'dev' instead of dereferencing it and other changes

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Date:   Wed, 18 Jan 2017 11:39:52 -0800
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 13/33] Input: bfin_rotary - Use 'dev' instead of
 dereferencing it and other changes

On Wed, Jan 18, 2017 at 09:46:34AM -0800, Guenter Roeck wrote:
> Use local variable 'dev' instead of dereferencing it several times.
> Other relevant changes:
>   Replace devm_add_action() with devm_add_action_or_reset()
> 
> This conversion was done automatically with coccinelle using the
> following semantic patches. The semantic patches and the scripts
> used to generate this commit log are available at
> https://github.com/groeck/coccinelle-patches
> 
> - Replace devm_add_action() followed by failure action with
>   devm_add_action_or_reset()
> - Drop unnecessary braces around conditional return statements
> - Use local variable 'struct device *dev' consistently
> 
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> ---
>  drivers/input/misc/bfin_rotary.c | 18 ++++++++----------
>  1 file changed, 8 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/input/misc/bfin_rotary.c b/drivers/input/misc/bfin_rotary.c
> index a0fc18fdfc0c..9f5790c6e06b 100644
> --- a/drivers/input/misc/bfin_rotary.c
> +++ b/drivers/input/misc/bfin_rotary.c
> @@ -141,25 +141,23 @@ static int bfin_rotary_probe(struct platform_device *pdev)
>  
>  	/* Basic validation */
>  	if ((pdata->rotary_up_key && !pdata->rotary_down_key) ||
> -	    (!pdata->rotary_up_key && pdata->rotary_down_key)) {
> +	    (!pdata->rotary_up_key && pdata->rotary_down_key))
>  		return -EINVAL;
> -	}

This is complex "if" statement, would prefer keep the braces.

>  
>  	if (pdata->pin_list) {
>  		error = peripheral_request_list(pdata->pin_list,
> -						dev_name(&pdev->dev));
> +						dev_name(dev));
>  		if (error) {
>  			dev_err(dev, "requesting peripherals failed: %d\n",
>  				error);
>  			return error;
>  		}
>  
> -		error = devm_add_action(dev, bfin_rotary_free_action,
> -					pdata->pin_list);
> +		error = devm_add_action_or_reset(dev, bfin_rotary_free_action,
> +						 pdata->pin_list);
>  		if (error) {
>  			dev_err(dev, "setting cleanup action failed: %d\n",
>  				error);
> -			peripheral_free_list(pdata->pin_list);
>  			return error;
>  		}
>  	}
> @@ -189,7 +187,7 @@ static int bfin_rotary_probe(struct platform_device *pdev)
>  
>  	input->name = pdev->name;
>  	input->phys = "bfin-rotary/input0";
> -	input->dev.parent = &pdev->dev;
> +	input->dev.parent = dev;
>  
>  	input_set_drvdata(input, rotary);
>  
> @@ -224,8 +222,8 @@ static int bfin_rotary_probe(struct platform_device *pdev)
>  		return -ENOENT;
>  	}
>  
> -	error = devm_request_irq(dev, rotary->irq, bfin_rotary_isr,
> -				 0, dev_name(dev), rotary);
> +	error = devm_request_irq(dev, rotary->irq, bfin_rotary_isr, 0,
> +				 dev_name(dev), rotary);

Do not see point of this change.

>  	if (error) {
>  		dev_err(dev, "unable to claim irq %d; error %d\n",
>  			rotary->irq, error);
> @@ -239,7 +237,7 @@ static int bfin_rotary_probe(struct platform_device *pdev)
>  	}
>  
>  	platform_set_drvdata(pdev, rotary);
> -	device_init_wakeup(&pdev->dev, 1);
> +	device_init_wakeup(dev, 1);
>  
>  	return 0;
>  }
> -- 
> 2.7.4
> 

Dropped the above 2 chunks and applied.

-- 
Dmitry