linux-kernel - [RESEND PATCH v5 0/5] driver core: add probe error check helper

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Date:   Wed, 24 Jun 2020 13:41:22 +0200
From:   Andrzej Hajda <a.hajda@...sung.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Andrzej Hajda <a.hajda@...sung.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        andy.shevchenko@...il.com, Mark Brown <broonie@...nel.org>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Neil Armstrong <narmstrong@...libre.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org (open list:DRM DRIVERS)
Subject: [RESEND PATCH v5 0/5] driver core: add probe error check helper

Hi All,

Recently I took some time to re-check error handling in drivers probe code,
and I have noticed that number of incorrect resource acquisition error handling
increased and there are no other propositions which can cure the situation.

So I have decided to resend my old proposition of probe_err helper which should
simplify resource acquisition error handling, it also extend it with adding defer
probe reason to devices_deferred debugfs property, which should improve debugging
experience for developers/testers.

In v5 I have also attached patch adding macro to replace quite frequent calls:
    probe_err(dev, PTR_ERR(ptr), ...)
with
    probe_err(dev, ptr, ...)

I have also added two patches showing usage and benefits of the helper.

My dirty/ad-hoc cocci scripts shows that this helper can be used in at least 2700 places
saving about 3500 lines of code.

Regards
Andrzej


Andrzej Hajda (5):
  driver core: add probe_err log helper
  driver core: add deferring probe reason to devices_deferred property
  drivers core: allow probe_err accept integer and pointer types
  drm/bridge/sii8620: fix resource acquisition error handling
  drm/bridge: lvds-codec: simplify error handling code

 drivers/base/base.h                  |  3 +++
 drivers/base/core.c                  | 20 ++++++++++++++++++++
 drivers/base/dd.c                    | 21 ++++++++++++++++++++-
 drivers/gpu/drm/bridge/lvds-codec.c  |  9 ++-------
 drivers/gpu/drm/bridge/sil-sii8620.c | 18 ++++++------------
 include/linux/device.h               | 26 ++++++++++++++++++++++++++
 6 files changed, 77 insertions(+), 20 deletions(-)

-- 
2.17.1