From: Tejun Heo <tj@kernel.org>
Date: Tue, 5 Apr 2011 16:01:44 +0000 (+0200)
Subject: workqueue: separate out drain_workqueue() from destroy_workqueue()
X-Git-Tag: v3.1-rc1~307^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9c5a2ba70251ecaab18c7a83e38b3c620223476c;p=pandora-kernel.git

workqueue: separate out drain_workqueue() from destroy_workqueue()

There are users which want to drain workqueues without destroying it.
Separate out drain functionality from destroy_workqueue() into
drain_workqueue() and make it accessible to workqueue users.

To guarantee forward-progress, only chain queueing is allowed while
drain is in progress.  If a new work item which isn't chained from the
running or pending work items is queued while draining is in progress,
WARN_ON_ONCE() is triggered.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: James Bottomley <James.Bottomley@hansenpartnership.com>
---

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