[rtl] printk safe in fifo handler?

[Joe Smith <jes@presto.med.upenn.edu>]

I know enough not to use printk from a rt process.  What about a fifo
i/o handler which is only triggered when the fifo is used from
userland?  It's somewhat academic, since I've already written the code
and it seems to work, but I got to worrying about it.

If it's not supposed to work, what kind of problems would it cause?

rt_printf is not doable, as we're using RTL1.2 for the time being.

<Joe