On Sat, Mar 27, 2010 at 01:12:23AM +0000, Ben Dooks wrote:

On Sat, Mar 27, 2010 at 01:41:52AM +0100, Ulf Samuelsson wrote:

quoted

I tried doing an I2C transfer inside the interrupt routine
(this is my only way of logging)
and then the I2C probe routine locked up already when
doing the request_irq.

i2c transfers can sleep, thus you need somet thread or work-queue to
process them. 

Or with current (post 2.6.29, IIRC 2.6.33 or later) kernels use a
threaded IRQ handler for the I2C interactions.