linux-kernel - Re: [PATCH v2 7/7] pwm: core: Simplify some devm

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Date:   Sun, 6 Jun 2021 23:45:12 +0200
From:   Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Flavio Suligoi <f.suligoi@...m.it>,
        Thierry Reding <thierry.reding@...il.com>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-pwm@...r.kernel.org, linux-acpi@...r.kernel.org,
        Jonathan Corbet <corbet@....net>,
        Lee Jones <lee.jones@...aro.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>
Subject: Re: [PATCH v2 7/7] pwm: core: Simplify some devm_*pwm*() functions

Hello Andy,

On Mon, May 31, 2021 at 10:49:47PM +0300, Andy Shevchenko wrote:
> Use devm_add_action_or_reset() instead of devres_alloc() and
> devres_add(), which works the same. This will simplify the
> code. There is no functional changes.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
> v2: new patch
>  drivers/pwm/core.c | 60 +++++++++++++++++++---------------------------
>  1 file changed, 25 insertions(+), 35 deletions(-)
> 
> diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
> index 6d4410bd9793..9f643414676b 100644
> --- a/drivers/pwm/core.c
> +++ b/drivers/pwm/core.c
> @@ -1059,9 +1059,9 @@ void pwm_put(struct pwm_device *pwm)
>  }
>  EXPORT_SYMBOL_GPL(pwm_put);
>  
> -static void devm_pwm_release(struct device *dev, void *res)
> +static void devm_pwm_release(void *pwm)
>  {
> -	pwm_put(*(struct pwm_device **)res);
> +	pwm_put(pwm);
>  }
>  
>  /**
> @@ -1077,19 +1077,16 @@ static void devm_pwm_release(struct device *dev, void *res)
>   */
>  struct pwm_device *devm_pwm_get(struct device *dev, const char *con_id)
>  {
> -	struct pwm_device **ptr, *pwm;
> -
> -	ptr = devres_alloc(devm_pwm_release, sizeof(*ptr), GFP_KERNEL);
> -	if (!ptr)
> -		return ERR_PTR(-ENOMEM);
> +	struct pwm_device *pwm;
> +	int ret;
>  
>  	pwm = pwm_get(dev, con_id);
> -	if (!IS_ERR(pwm)) {
> -		*ptr = pwm;
> -		devres_add(dev, ptr);
> -	} else {
> -		devres_free(ptr);
> -	}
> +	if (IS_ERR(pwm))
> +		return pwm;
> +
> +	ret = devm_add_action_or_reset(dev, devm_pwm_release, pwm);
> +	if (ret)
> +		return ERR_PTR(ret);
>  
>  	return pwm;
>  }
> @@ -1110,19 +1107,16 @@ EXPORT_SYMBOL_GPL(devm_pwm_get);
>  struct pwm_device *devm_of_pwm_get(struct device *dev, struct device_node *np,
>  				   const char *con_id)
>  {
> -	struct pwm_device **ptr, *pwm;
> -
> -	ptr = devres_alloc(devm_pwm_release, sizeof(*ptr), GFP_KERNEL);
> -	if (!ptr)
> -		return ERR_PTR(-ENOMEM);
> +	struct pwm_device *pwm;
> +	int ret;
>  
>  	pwm = of_pwm_get(dev, np, con_id);
> -	if (!IS_ERR(pwm)) {
> -		*ptr = pwm;
> -		devres_add(dev, ptr);
> -	} else {
> -		devres_free(ptr);
> -	}
> +	if (IS_ERR(pwm))
> +		return pwm;
> +
> +	ret = devm_add_action_or_reset(dev, devm_pwm_release, pwm);
> +	if (ret)
> +		return ERR_PTR(ret);
>  
>  	return pwm;
>  }
> @@ -1144,23 +1138,19 @@ struct pwm_device *devm_fwnode_pwm_get(struct device *dev,
>  				       struct fwnode_handle *fwnode,
>  				       const char *con_id)
>  {
> -	struct pwm_device **ptr, *pwm = ERR_PTR(-ENODEV);
> -
> -	ptr = devres_alloc(devm_pwm_release, sizeof(*ptr), GFP_KERNEL);
> -	if (!ptr)
> -		return ERR_PTR(-ENOMEM);
> +	struct pwm_device *pwm = ERR_PTR(-ENODEV);
> +	int ret;
>  
>  	if (is_of_node(fwnode))
>  		pwm = of_pwm_get(dev, to_of_node(fwnode), con_id);
>  	else if (is_acpi_node(fwnode))
>  		pwm = acpi_pwm_get(fwnode);
> +	if (IS_ERR(pwm))
> +		return pwm;
>  
> -	if (!IS_ERR(pwm)) {
> -		*ptr = pwm;
> -		devres_add(dev, ptr);
> -	} else {
> -		devres_free(ptr);
> -	}
> +	ret = devm_add_action_or_reset(dev, devm_pwm_release, pwm);
> +	if (ret)
> +		return ERR_PTR(ret);
>  

Another nice one:

Reviewed-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>

Thanks
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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