linux-kernel - [PATCH 0/3] Fix races on device removal

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Date:   Wed, 8 Jul 2020 15:27:00 +0200
From:   Lukas Wunner <lukas@...ner.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
        Alexander Duyck <alexander.h.duyck@...ux.intel.com>,
        Mark Brown <broonie@...nel.org>, linux-kernel@...r.kernel.org,
        linux-spi@...r.kernel.org
Subject: [PATCH 0/3] Fix races on device removal

Prevent dynamic SPI device addition below a controller which is
being removed.  To do so, set the controller's "dead" flag using
kill_device() (patch [3/3]).

Serialize access to a device's "dead" flag with a newly introduced
rw_semaphore in lieu of the device_lock to avoid deadlocks occurring
with the new use case (patch [2/3]).

Add a missing check for the "dead" flag upon driver binding
(patch [1/3]).


Lukas Wunner (3):
  driver core: Avoid binding drivers to dead devices
  driver core: Use rwsem for kill_device() serialization
  driver core: Avoid adding children below a dead parent

 drivers/base/base.h  |  2 ++
 drivers/base/core.c  | 49 ++++++++++++++++++++++++++++++--------------
 drivers/base/dd.c    | 12 ++++++++++-
 drivers/nvdimm/bus.c |  8 +-------
 drivers/spi/spi.c    |  3 +++
 5 files changed, 51 insertions(+), 23 deletions(-)

-- 
2.27.0