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SubjectRe: [PATCH 15/23] gpio: mockup: use dynamic device IDs
On Fri, Sep 04, 2020 at 05:45:39PM +0200, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
>
> We're currently creating chips at module init time only so using a
> static index for dummy devices is fine. We want to support dynamically
> created chips however so we need to switch to dynamic device IDs.

It misses ida_destroy().

What about XArray API?

> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> ---
> drivers/gpio/gpio-mockup.c | 17 ++++++++++++++++-
> 1 file changed, 16 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpio/gpio-mockup.c b/drivers/gpio/gpio-mockup.c
> index 96976ba66598..995e37fef9c5 100644
> --- a/drivers/gpio/gpio-mockup.c
> +++ b/drivers/gpio/gpio-mockup.c
> @@ -9,6 +9,7 @@
>
> #include <linux/debugfs.h>
> #include <linux/gpio/driver.h>
> +#include <linux/idr.h>
> #include <linux/interrupt.h>
> #include <linux/irq.h>
> #include <linux/irq_sim.h>
> @@ -70,6 +71,8 @@ module_param_named(gpio_mockup_named_lines,
>
> static struct dentry *gpio_mockup_dbg_dir;
>
> +static DEFINE_IDA(gpio_mockup_ida);
> +
> static int gpio_mockup_range_base(unsigned int index)
> {
> return gpio_mockup_ranges[index * 2];
> @@ -480,8 +483,12 @@ static LIST_HEAD(gpio_mockup_devices);
>
> static void gpio_mockup_unregister_one_device(struct gpio_mockup_device *dev)
> {
> + int id;
> +
> list_del(&dev->list);
> + id = dev->pdev->id;
> platform_device_unregister(dev->pdev);
> + ida_free(&gpio_mockup_ida, id);
> kfree(dev);
> }
>
> @@ -587,12 +594,19 @@ static int __init gpio_mockup_init(void)
> }
>
> pdevinfo.name = "gpio-mockup";
> - pdevinfo.id = i;
> pdevinfo.properties = properties;
>
> + pdevinfo.id = ida_alloc(&gpio_mockup_ida, GFP_KERNEL);
> + if (pdevinfo.id < 0) {
> + kfree_strarray(line_names, ngpio);
> + err = pdevinfo.id;
> + goto err_out;
> + }
> +
> mockup_dev = kzalloc(sizeof(*mockup_dev), GFP_KERNEL);
> if (!mockup_dev) {
> kfree_strarray(line_names, ngpio);
> + ida_free(&gpio_mockup_ida, pdevinfo.id);
> err = -ENOMEM;
> goto err_out;
> }
> @@ -601,6 +615,7 @@ static int __init gpio_mockup_init(void)
> kfree_strarray(line_names, ngpio);
> if (IS_ERR(mockup_dev->pdev)) {
> pr_err("error registering device");
> + ida_free(&gpio_mockup_ida, pdevinfo.id);
> kfree(mockup_dev);
> err = PTR_ERR(mockup_dev->pdev);
> goto err_out;
> --
> 2.26.1
>

--
With Best Regards,
Andy Shevchenko


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