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

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Message-ID: <CANA+-vAEnH7JpC1RLQW6jfe=+azyksoLBLQQ1vWVdszJy1xeqA@mail.gmail.com>
Date:   Wed, 31 Jul 2019 15:16:57 -0700
From:   Tri Vo <trong@...roid.com>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Hridya Valsaraju <hridya@...gle.com>,
        Sandeep Patil <sspatil@...gle.com>,
        Kalesh Singh <kaleshsingh@...gle.com>,
        Ravi Chandra Sadineni <ravisadineni@...omium.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        "Cc: Android Kernel" <kernel-team@...roid.com>
Subject: Re: [PATCH v6] PM / wakeup: show wakeup sources stats in sysfs

On Wed, Jul 31, 2019 at 2:59 PM Stephen Boyd <swboyd@...omium.org> wrote:
>
> 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'?

I don't really have an opinion on this. Rafael seems to prefer "ws",
and he's the maintainer :)
>
> > +                                       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()?

oops
>
> > +}
> > +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.

will do