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

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Message-ID: <20180514115135.GG18312@ulmo>
Date:   Mon, 14 May 2018 13:51:35 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Dmitry Osipenko <digetx@...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 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

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