linux-kernel - Re: [PATCH] component: Silence bind error on -EPROBE

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Date:   Tue, 14 Apr 2020 17:56:03 -0600
From:   James Hilliard <james.hilliard1@...il.com>
To:     Jani Nikula <jani.nikula@...ux.intel.com>
Cc:     dri-devel@...ts.freedesktop.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>
Subject: Re: [PATCH] component: Silence bind error on -EPROBE_DEFER

On Tue, Apr 14, 2020 at 5:07 AM Jani Nikula <jani.nikula@...ux.intel.com> wrote:
>
> On Fri, 10 Apr 2020, James Hilliard <james.hilliard1@...il.com> wrote:
> > If a component fails to bind due to -EPROBE_DEFER we should not log an
> > error as this is not a real failure.
> >
> > Fixes:
> > vc4-drm soc:gpu: failed to bind 3f902000.hdmi (ops vc4_hdmi_ops): -517
> > vc4-drm soc:gpu: master bind failed: -517
>
> I'd think the probe defer is useful information anyway. Maybe just tone
> down the severity and/or the message?
That's probably not needed as there's dev_dbg logging for -EPROBE_DEFER
elsewhere from what it looks like.

For example:
https://github.com/torvalds/linux/blob/v5.6/drivers/base/dd.c#L621
>
> BR,
> Jani.
>
> >
> > Signed-off-by: James Hilliard <james.hilliard1@...il.com>
> > ---
> >  drivers/base/component.c | 9 ++++++---
> >  1 file changed, 6 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/base/component.c b/drivers/base/component.c
> > index e97704104784..157c6c790578 100644
> > --- a/drivers/base/component.c
> > +++ b/drivers/base/component.c
> > @@ -256,7 +256,8 @@ static int try_to_bring_up_master(struct master *master,
> >       ret = master->ops->bind(master->dev);
> >       if (ret < 0) {
> >               devres_release_group(master->dev, NULL);
> > -             dev_info(master->dev, "master bind failed: %d\n", ret);
> > +             if (ret != -EPROBE_DEFER)
> > +                     dev_info(master->dev, "master bind failed: %d\n", ret);
> >               return ret;
> >       }
> >
> > @@ -611,8 +612,10 @@ static int component_bind(struct component *component, struct master *master,
> >               devres_release_group(component->dev, NULL);
> >               devres_release_group(master->dev, NULL);
> >
> > -             dev_err(master->dev, "failed to bind %s (ops %ps): %d\n",
> > -                     dev_name(component->dev), component->ops, ret);
> > +             if (ret != -EPROBE_DEFER) {
> > +                     dev_err(master->dev, "failed to bind %s (ops %ps): %d\n",
> > +                             dev_name(component->dev), component->ops, ret);
> > +             }
> >       }
> >
> >       return ret;
>
> --
> Jani Nikula, Intel Open Source Graphics Center