Kernel ioctl concurrency control

[joraff]

I apologize: this is more of a question than an issue.

What are others doing to avoid I/O errors from simultaneous access to a linux i2c device file? I am thinking of creating a module that implements a job queue for i2c actions on a single device (/dev/i2c-1) using this module and something like https://github.com/caolan/async queue.

Is anyone else already doing this?