Calling printk with locks held

I've just been told that it's not OK to call printk while holding a lock.
This came as a surprise to me, as I've written thousands of lines of code
that calls printk while holding multiple locks, and have not seen any
problem. The only explanation I was given was that it can deadlock.

Is this correct? I thought there were very few places where it was not safe
to call printk.

Neil Baylis
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.kernelnewbies.org/pipermail/kernelnewbies/attachments/20110602/5d2ee90a/attachment.html