linux-kernel - Re: [PATCH v9 0/4] driver core: add probe error check helper

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Message-ID: <20200730181639.GG5055@sirena.org.uk>
Date:   Thu, 30 Jul 2020 19:16:39 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Jonas Karlman <jonas@...boo.se>,
        lkml <linux-kernel@...r.kernel.org>,
        "open list:DRM DRIVERS" <dri-devel@...ts.freedesktop.org>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Neil Armstrong <narmstrong@...libre.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [PATCH v9 0/4] driver core: add probe error check helper

On Thu, Jul 30, 2020 at 10:46:31AM -0700, Dmitry Torokhov wrote:
> On Thu, Jul 30, 2020 at 9:49 AM Mark Brown <broonie@...nel.org> wrote:

> > The error messages are frequently in the caller rather than the
> > frameworks, it's often helpful for the comprehensibility of the error
> > messages especially in cases where things may be legitimately absent.

> Not for deferral. All you need to know in this case is:

> "device A is attempting to request resource B which is not ready yet"

> There is nothing to handle on the caller part except to float the error up.

You can sometimes do a better job of explaining what the resource you
were looking for was, and of course you still need diagnostics in the
non-deferral case.  Whatever happens we'll need a lot of per-driver
churn, either removing existing diagnostics that get factored into cores
or updating to use this new API.

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