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Subject: Re: [PATCH v2 01/10] tpm/tpm_i2c_infineon: switch to
 i2c_lock_bus(..., I2C_LOCK_SEGMENT)
To:     Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
        Peter Rosin <peda@axentia.se>
CC:     <linux-kernel@vger.kernel.org>, Peter Huewe <peterhuewe@gmx.de>,
        Jason Gunthorpe <jgg@ziepe.ca>, Arnd Bergmann <arnd@arndb.de>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
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        Gregory Fong <gregory.0xf0@gmail.com>,
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        Sekhar Nori <nsekhar@ti.com>,
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        Haavard Skinnemoen <hskinnemoen@gmail.com>,
        Kukjin Kim <kgene@kernel.org>,
        Krzysztof Kozlowski <krzk@kernel.org>,
        Orson Zhai <orsonzhai@gmail.com>,
        Baolin Wang <baolin.wang@linaro.org>,
        Chunyan Zhang <zhang.lyra@gmail.com>,
        Wolfram Sang <wsa@the-dreams.de>,
        Guenter Roeck <linux@roeck-us.net>, Crt Mori <cmo@melexis.com>,
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        Dmitry Torokhov <dmitry.torokhov@gmail.com>,
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        Michael Krufky <mkrufky@linuxtv.org>,
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References: <20180620051803.12206-1-peda@axentia.se>
 <20180620051803.12206-2-peda@axentia.se>
 <20180625102454.GA3845@linux.intel.com>
From:   Alexander Steffen <Alexander.Steffen@infineon.com>
Message-ID: <7703d6a2-b22c-104c-7390-b5143a504725@infineon.com>
Date:   Tue, 26 Jun 2018 12:07:21 +0200
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On 25.06.2018 12:24, Jarkko Sakkinen wrote:
> On Wed, Jun 20, 2018 at 07:17:54AM +0200, Peter Rosin wrote:
>> Locking the root adapter for __i2c_transfer will deadlock if the
>> device sits behind a mux-locked I2C mux. Switch to the finer-grained
>> i2c_lock_bus with the I2C_LOCK_SEGMENT flag. If the device does not
>> sit behind a mux-locked mux, the two locking variants are equivalent.
>>
>> Signed-off-by: Peter Rosin <peda@axentia.se>
> 
> Studied enough so that I can give
> 
> Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
> 
> Do not have hardware to test this, however.

I don't have a mux-locked I2C mux either, but at least I can confirm 
that this change did not break my existing test setup (SLB9635/SLB9645 
on Raspberry Pi 2B).

Tested-by: Alexander Steffen <Alexander.Steffen@infineon.com>

Alexander