linux-kernel - Re: [PATCH] gpiolib: switch to simpler IDA interface

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Date:   Tue, 8 Sep 2020 16:47:33 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Kent Gibson <warthog618@...il.com>, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH] gpiolib: switch to simpler IDA interface

On Tue, Sep 08, 2020 at 03:12:25PM +0200, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bgolaszewski@...libre.com>
> 
> We don't need to specify any ranges when allocating IDs so we can switch
> to ida_alloc() and ida_free() instead of the ida_simple_ counterparts.
> 
> ida_simple_get(ida, 0, 0, gfp) is equivalent to
> ida_alloc_range(ida, 0, UINT_MAX, gfp) which is equivalent to
> ida_alloc(ida, gfp). Note: IDR will never actually allocate an ID
> larger than INT_MAX.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

> Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
> ---
>  drivers/gpio/gpiolib.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> index 80137c1b3cdc..97f76334ec7e 100644
> --- a/drivers/gpio/gpiolib.c
> +++ b/drivers/gpio/gpiolib.c
> @@ -426,7 +426,7 @@ static void gpiodevice_release(struct device *dev)
>  	struct gpio_device *gdev = dev_get_drvdata(dev);
>  
>  	list_del(&gdev->list);
> -	ida_simple_remove(&gpio_ida, gdev->id);
> +	ida_free(&gpio_ida, gdev->id);
>  	kfree_const(gdev->label);
>  	kfree(gdev->descs);
>  	kfree(gdev);
> @@ -537,7 +537,7 @@ int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data,
>  		gc->of_node = gdev->dev.of_node;
>  #endif
>  
> -	gdev->id = ida_simple_get(&gpio_ida, 0, 0, GFP_KERNEL);
> +	gdev->id = ida_alloc(&gpio_ida, GFP_KERNEL);
>  	if (gdev->id < 0) {
>  		ret = gdev->id;
>  		goto err_free_gdev;
> @@ -705,7 +705,7 @@ int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data,
>  err_free_descs:
>  	kfree(gdev->descs);
>  err_free_ida:
> -	ida_simple_remove(&gpio_ida, gdev->id);
> +	ida_free(&gpio_ida, gdev->id);
>  err_free_gdev:
>  	/* failures here can mean systems won't boot... */
>  	pr_err("%s: GPIOs %d..%d (%s) failed to register, %d\n", __func__,
> -- 
> 2.26.1
> 

-- 
With Best Regards,
Andy Shevchenko