linux-kernel - Re: [PATCH v1] mfd: tps6586x: Move interrupt handling into workqueue

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Date:   Mon, 14 May 2018 15:01:49 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>
Cc:     Lee Jones <lee.jones@...aro.org>,
        Jonathan Hunter <jonathanh@...dia.com>,
        linux-tegra@...r.kernel.org, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] mfd: tps6586x: Move interrupt handling into workqueue

On 14.05.2018 14:51, Thierry Reding wrote:
> On Mon, May 14, 2018 at 12:18:42AM +0300, Dmitry Osipenko wrote:
>> Reading of status register within the interrupt handler fails with -EAGAIN
>> if I2C is busy with handling some other request at the same time. Move the
>> actual interrupt handling into a workqueue to avoid the unfortunate I2C
>> failure and to avoid hanging CPU in interrupt up to 1 second (transfer
>> timeout in the Tegra I2C driver).
>>
>> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
>> ---
>>  drivers/mfd/tps6586x.c | 40 +++++++++++++++++++++++++++++-----------
>>  1 file changed, 29 insertions(+), 11 deletions(-)
> 
> Could this not be achieved with a threaded interrupt handler?
> 
> Thierry
> 

Seems yes. I completely forgot about the threaded interrupt handlers existence.
Thank you very much for the suggestion, I'll try with the threaded IRQ and send
v2 if it will be fine.