linux-kernel - Calling add_disk() from a work

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Message-ID: <3aadbf9e0708051121m3ce8e044g104f58c17466eb60@mail.gmail.com>
Date:	Mon, 6 Aug 2007 02:21:55 +0800
From:	"Othello Reversi" <othello.reversi@...glemail.com>
To:	linux-kernel@...r.kernel.org
Subject: Calling add_disk() from a work_queue item

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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