linux-kernel - [PATCH v2 0/2] NVIDIA Tegra I2C synchronization correction

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Date:   Tue, 24 Mar 2020 22:12:15 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Laxman Dewangan <ldewangan@...dia.com>,
        Wolfram Sang <wsa@...-dreams.de>
Cc:     linux-i2c@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 0/2] NVIDIA Tegra I2C synchronization correction

Hello,

Recently I found a way to reliably reproduce I2C timeouts that happen due
to improper synchronizations made by the I2C driver. It's quite easy to
reproduce the problem when memory is running on a lower freq + there is
some memory activity + CPU could get busy for a significant time. This
is the case when KASAN is enabled and CPU is busy while accessing FS via
NFS. This small series addresses the found problems.

Changelog:

v2: - The "Better handle case where CPU0 is busy for a long time" patch
      now preserves the old behavior where completion is checked after
      disabling the interrupt, preventing potential race-condition of
      the completion awaiting vs interrupt syncing.

Dmitry Osipenko (2):
  i2c: tegra: Better handle case where CPU0 is busy for a long time
  i2c: tegra: Synchronize DMA before termination

 drivers/i2c/busses/i2c-tegra.c | 36 ++++++++++++++++++++++------------
 1 file changed, 24 insertions(+), 12 deletions(-)

-- 
2.25.1