linux-kernel - [PATCH v1 0/5] iio: treewide: rearrange iio trig get/register

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Message-ID: <20220523164159.11579-1-ddrokosov@sberdevices.ru>
Date:   Mon, 23 May 2022 16:41:35 +0000
From:   Dmitry Rokosov <DDRokosov@...rdevices.ru>
To:     "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "jic23@...nel.org" <jic23@...nel.org>,
        "lars@...afoo.de" <lars@...afoo.de>,
        "andy.shevchenko@...il.com" <andy.shevchenko@...il.com>,
        "lorenzo.bianconi83@...il.com" <lorenzo.bianconi83@...il.com>,
        "linus.walleij@...aro.org" <linus.walleij@...aro.org>,
        "stephan@...hold.net" <stephan@...hold.net>,
        "hdegoede@...hat.com" <hdegoede@...hat.com>,
        "antoniu.miclaus@...log.com" <antoniu.miclaus@...log.com>,
        "sean@...nix.com" <sean@...nix.com>,
        "linmq006@...il.com" <linmq006@...il.com>,
        "gwendal@...omium.org" <gwendal@...omium.org>,
        "yangyingliang@...wei.com" <yangyingliang@...wei.com>
CC:     "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        kernel <kernel@...rdevices.ru>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Dmitry Rokosov <DDRokosov@...rdevices.ru>
Subject: [PATCH v1 0/5] iio: treewide: rearrange iio trig get/register

The following patchset resolves problems with iio_trigger_get() and
iio_trigger_register() call order in the different IIO drivers.

IIO trigger interface function iio_trigger_get() should be called after
iio_trigger_register() (or its devm analogue) strictly, because of
iio_trigger_get() acquires module refcnt based on the trigger->owner
pointer, which is initialized inside iio_trigger_register() to
THIS_MODULE.
If this call order is wrong, the next iio_trigger_put() (from sysfs
callbacks or rmmod) will derefence "default" module refcnt, which is
completely incorrect.

Dmitry Rokosov (5):
  iio:accel:bma180: rearrange iio trigger get and register
  iio:accel:kxcjk-1013: rearrange iio trigger get and register
  iio:accel:mxc4005: rearrange iio trigger get and register
  iio:chemical:ccs811: rearrange iio trigger get and register
  iio:humidity:hts221: rearrange iio trigger get and register

 drivers/iio/accel/bma180.c           | 3 ++-
 drivers/iio/accel/kxcjk-1013.c       | 4 ++--
 drivers/iio/accel/mxc4005.c          | 4 ++--
 drivers/iio/chemical/ccs811.c        | 4 ++--
 drivers/iio/humidity/hts221_buffer.c | 5 ++++-
 5 files changed, 12 insertions(+), 8 deletions(-)

-- 
2.36.0