Calling add_disk() from a work_queue item

[Othello Reversi]

Hi List,

    I would like to know why calling add_disk() from a kernel thread
which is running from a work_queue would cause the work item to block
with the "D" (disk wait) state at best under kernel 2.6.17 and cause a
hard-lockup on kernel 2.6.22.1?

    If I    recall correctly, work items running on the work_queue are
allowed to sleep, and add_disk() is known to sleep.  Did I miss out
some details such as a lock I have to acquire?

    Hope to hear a reply soon.

Regards,
Othello

PS: Would like to be CC'ed comments and replies.
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