linux-kernel - Re: i2c send inside ISR

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Message-ID: <20110127122542.GA11937@sirena.org.uk>
Date:	Thu, 27 Jan 2011 12:25:44 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	"Murali K. Vemuri" <vemuri.muralikrishna@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: i2c send inside ISR

On Thu, Jan 27, 2011 at 09:22:27PM +0900, Murali K. Vemuri wrote:

> I am working on a driver, and I reached a problem.
> problem: My driver is supposed to send I2C message whenever it
> receives an interrupt. the interrupt is generated when a GPIO  is
> detected to be FALLING EDGE of input voltage.
> Now, when I am sending the i2c message, I am getting the error and
> dump like the following:
> Any suggestions???

Use a threaded IRQ handler registered with request_threaded_irq() -
if you grep for that within the kernel you'll find quite a few examples
of handling interrupts from I2C connected devices.  You can't use I2C or
other buses that need to sleep from within hard interrupt context.
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