linux-kernel - [PATCH v2 0/2] Re: Problem: lockdep warning with nested instances of i2c-mux

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Date:   Thu, 24 May 2018 10:46:44 +0200
From:   Peter Rosin <peda@...ntia.se>
To:     linux-kernel@...r.kernel.org
Cc:     Peter Rosin <peda@...ntia.se>, Wolfram Sang <wsa@...-dreams.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Will Deacon <will.deacon@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Davidlohr Bueso <dave@...olabs.net>, linux-i2c@...r.kernel.org,
        Peter Chang <dpf@...gle.com>,
        Deepa Dinamani <deepadinamani@...gle.com>,
        John Sperbeck <jsperbeck@...gle.com>
Subject: [PATCH v2 0/2] Re: Problem: lockdep warning with nested instances of i2c-mux

Changes since v1:
- Further compile tests indicated a missing #define for rt_mutex_lock
  with lockdep enabled, so that one is added.
- I have verified that I don't get any lockdep splat for a local i2c-mux
  setup with these patches applied, and that I do without them.

Again, thanks for the report!

Cheers,
Peter

Peter Rosin (2):
  rtmutex: allow specifying a subclass for nested locking
  i2c: mux: annotate the nested rt_mutex usage

 drivers/i2c/i2c-core-base.c |  2 +-
 drivers/i2c/i2c-mux.c       |  4 ++--
 include/linux/rtmutex.h     |  7 +++++++
 kernel/locking/rtmutex.c    | 29 +++++++++++++++++++++++++----
 4 files changed, 35 insertions(+), 7 deletions(-)

-- 
2.11.0