linux-kernel - Re: [PATCH v6] PM / wakeup: show wakeup sources stats in sysfs

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Date:   Wed, 31 Jul 2019 14:59:32 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Tri Vo <trong@...roid.com>, gregkh@...uxfoundation.org,
        rjw@...ysocki.net, viresh.kumar@...aro.org
Cc:     rafael@...nel.org, hridya@...gle.com, sspatil@...gle.com,
        kaleshsingh@...gle.com, ravisadineni@...omium.org,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        kernel-team@...roid.com, Tri Vo <trong@...roid.com>
Subject: Re: [PATCH v6] PM / wakeup: show wakeup sources stats in sysfs

Quoting Tri Vo (2019-07-31 14:55:14)
> +/**
> + * wakeup_source_sysfs_add - Add wakeup_source attributes to sysfs.
> + * @parent: Device given wakeup source is associated with (or NULL if virtual).
> + * @ws: Wakeup source to be added in sysfs.
> + */
> +int wakeup_source_sysfs_add(struct device *parent, struct wakeup_source *ws)
> +{
> +       struct device *dev;
> +       int id;
> +
> +       id = ida_alloc(&wakeup_ida, GFP_KERNEL);
> +       if (id < 0)
> +               return id;
> +       ws->id = id;
> +
> +       dev = device_create_with_groups(wakeup_class, parent, MKDEV(0, 0), ws,
> +                                       wakeup_source_groups, "ws%d",

I thought the name was going to still be 'wakeupN'?

> +                                       ws->id);
> +       if (IS_ERR(dev)) {
> +               ida_free(&wakeup_ida, ws->id);
> +               return PTR_ERR(dev);
> +       }
> +
> +       ws->dev = dev;
> +       return 0;
> +}
> +EXPORT_SYMBOL_GPL(wakeup_source_sysfs_add);
> +
> +/**
> + * wakeup_source_sysfs_remove - Remove wakeup_source attributes from sysfs.
> + * @ws: Wakeup source to be removed from sysfs.
> + */
> +void wakeup_source_sysfs_remove(struct wakeup_source *ws)
> +{
> +       device_unregister(ws->dev);
> +       ida_simple_remove(&wakeup_ida, ws->id);

Should be ida_free()?

> +}
> +EXPORT_SYMBOL_GPL(wakeup_source_sysfs_remove);
> +
> +static int __init wakeup_sources_sysfs_init(void)
> +{
> +       wakeup_class = class_create(THIS_MODULE, "wakeup");
> +
> +       return PTR_ERR_OR_ZERO(wakeup_class);
> +}
> +
> +postcore_initcall(wakeup_sources_sysfs_init);

Style nitpick: Stick the initcall to the function it calls by dropping
the extra newline between them.