linux-kernel - Re: [PATCH 4/5] libnvdimm: Drop unused device power management support

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Message-ID: <CAPcyv4gjA-AmYkUphLBmmnM1GFWcJ4WJHNobyw833DVp3XPwqw@mail.gmail.com>
Date:   Fri, 11 Jun 2021 17:16:55 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc:     linux-cxl@...r.kernel.org, Linux NVDIMM <nvdimm@...ts.linux.dev>,
        Ben Widawsky <ben.widawsky@...el.com>,
        "Schofield, Alison" <alison.schofield@...el.com>,
        Vishal L Verma <vishal.l.verma@...el.com>,
        "Weiny, Ira" <ira.weiny@...el.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/5] libnvdimm: Drop unused device power management support

On Fri, Jun 11, 2021 at 4:47 AM Jonathan Cameron
<Jonathan.Cameron@...wei.com> wrote:
>
> On Thu, 10 Jun 2021 15:26:19 -0700
> Dan Williams <dan.j.williams@...el.com> wrote:
>
> > LIBNVDIMM device objects register sysfs power attributes despite nothing
> > requiring that support. Clean up sysfs remove the power/ attribute
> > group. This requires a device_create() and a device_register() usage to
> > be converted to the device_initialize() + device_add() pattern.
> >
> > Signed-off-by: Dan Williams <dan.j.williams@...el.com>
> Trivial comment below. Looks good.
>
> > ---
> >  drivers/nvdimm/bus.c |   45 +++++++++++++++++++++++++++++++++++++--------
> >  1 file changed, 37 insertions(+), 8 deletions(-)
> >
> > diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c
> > index a11821df83b5..e6aa87043a95 100644
> > --- a/drivers/nvdimm/bus.c
> > +++ b/drivers/nvdimm/bus.c
> > @@ -363,8 +363,13 @@ struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
> >       nvdimm_bus->dev.groups = nd_desc->attr_groups;
> >       nvdimm_bus->dev.bus = &nvdimm_bus_type;
> >       nvdimm_bus->dev.of_node = nd_desc->of_node;
> > -     dev_set_name(&nvdimm_bus->dev, "ndbus%d", nvdimm_bus->id);
> > -     rc = device_register(&nvdimm_bus->dev);
> > +     device_initialize(&nvdimm_bus->dev);
> > +     device_set_pm_not_required(&nvdimm_bus->dev);
> > +     rc = dev_set_name(&nvdimm_bus->dev, "ndbus%d", nvdimm_bus->id);
> > +     if (rc)
> > +             goto err;
>
> Maybe mention in patch description that you also now handle errors in
> dev_set_name()?

Yeah, that's a philosophy change from when this code was first written.