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From:   Andrzej Hajda <a.hajda@samsung.com>
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc:     Andrzej Hajda <a.hajda@samsung.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
        Marek Szyprowski <m.szyprowski@samsung.com>,
        "Rafael J. Wysocki" <rafael@kernel.org>,
        linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        andy.shevchenko@gmail.com, Mark Brown <broonie@kernel.org>,
        Russell King - ARM Linux <linux@armlinux.org.uk>,
        Neil Armstrong <narmstrong@baylibre.com>,
        Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
        Jonas Karlman <jonas@kwiboo.se>,
        Jernej Skrabec <jernej.skrabec@siol.net>,
        Daniel Vetter <daniel@ffwll.ch>,
        dri-devel@lists.freedesktop.org (open list:DRM DRIVERS)
Subject: [RESEND PATCH v5 0/5] driver core: add probe error check helper
Date:   Wed, 24 Jun 2020 13:41:22 +0200
Message-Id: <20200624114127.3016-1-a.hajda@samsung.com>
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References: <CGME20200624114134eucas1p2799e0ae76fcb026a0e4bcccc2026b732@eucas1p2.samsung.com>
Sender: linux-kernel-owner@vger.kernel.org
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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