linux-kernel - Re: [PATCH 1/7] Input: pmic8xxx-pwrkey - Pass input device directly to interrupt

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Message-ID: <20131215112103.GA14818@core.coreip.homeip.net>
Date:	Sun, 15 Dec 2013 03:21:04 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Stephen Boyd <sboyd@...eaurora.org>
Cc:	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-input@...r.kernel.org
Subject: Re: [PATCH 1/7] Input: pmic8xxx-pwrkey - Pass input device directly
 to interrupt

Hi Stephen,

On Tue, Dec 10, 2013 at 03:43:10PM -0800, Stephen Boyd wrote:
> Instead of passing the pointer to the container structure just
> pass the input device here. This saves a dereference in the fast
> path.
> 
> Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
> ---
>  drivers/input/misc/pmic8xxx-pwrkey.c | 22 ++++++++--------------
>  1 file changed, 8 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/input/misc/pmic8xxx-pwrkey.c b/drivers/input/misc/pmic8xxx-pwrkey.c
> index ce3c426..233b216 100644
> --- a/drivers/input/misc/pmic8xxx-pwrkey.c
> +++ b/drivers/input/misc/pmic8xxx-pwrkey.c
> @@ -32,26 +32,21 @@
>   * @key_press_irq: key press irq number
>   */
>  struct pmic8xxx_pwrkey {
> -	struct input_dev *pwr;

This causes compile errors as you need pwrkey->pwr in remove() to
unregister input device. I'll fix it up.

>  	int key_press_irq;
>  };
>  
> -static irqreturn_t pwrkey_press_irq(int irq, void *_pwrkey)
> +static irqreturn_t pwrkey_press_irq(int irq, void *pwr)
>  {
> -	struct pmic8xxx_pwrkey *pwrkey = _pwrkey;
> -
> -	input_report_key(pwrkey->pwr, KEY_POWER, 1);
> -	input_sync(pwrkey->pwr);
> +	input_report_key(pwr, KEY_POWER, 1);
> +	input_sync(pwr);
>  
>  	return IRQ_HANDLED;
>  }
>  
> -static irqreturn_t pwrkey_release_irq(int irq, void *_pwrkey)
> +static irqreturn_t pwrkey_release_irq(int irq, void *pwr)
>  {
> -	struct pmic8xxx_pwrkey *pwrkey = _pwrkey;
> -
> -	input_report_key(pwrkey->pwr, KEY_POWER, 0);
> -	input_sync(pwrkey->pwr);
> +	input_report_key(pwr, KEY_POWER, 0);
> +	input_sync(pwr);
>  
>  	return IRQ_HANDLED;
>  }
> @@ -147,12 +142,11 @@ static int pmic8xxx_pwrkey_probe(struct platform_device *pdev)
>  	}
>  
>  	pwrkey->key_press_irq = key_press_irq;
> -	pwrkey->pwr = pwr;
>  
>  	platform_set_drvdata(pdev, pwrkey);
>  
>  	err = devm_request_irq(&pdev->dev, key_press_irq, pwrkey_press_irq,
> -		IRQF_TRIGGER_RISING, "pmic8xxx_pwrkey_press", pwrkey);
> +		IRQF_TRIGGER_RISING, "pmic8xxx_pwrkey_press", pwr);
>  	if (err < 0) {
>  		dev_dbg(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
>  				 key_press_irq, err);
> @@ -160,7 +154,7 @@ static int pmic8xxx_pwrkey_probe(struct platform_device *pdev)
>  	}
>  
>  	err = devm_request_irq(&pdev->dev, key_release_irq, pwrkey_release_irq,
> -		 IRQF_TRIGGER_RISING, "pmic8xxx_pwrkey_release", pwrkey);
> +		 IRQF_TRIGGER_RISING, "pmic8xxx_pwrkey_release", pwr);
>  	if (err < 0) {
>  		dev_dbg(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
>  				 key_release_irq, err);
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> hosted by The Linux Foundation
> 

-- 
Dmitry
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