From: Tejun Heo <tj@kernel.org>
Date: Fri, 3 Aug 2012 17:30:47 +0000 (-0700)
Subject: workqueue: implement mod_delayed_work[_on]()
X-Git-Tag: omap-for-v3.7-rc1/fixes-cpufreq-signed~52^2~35
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8376fe22c7e79c7e90857d39f82aeae6cad6c4b8;p=pandora-kernel.git

workqueue: implement mod_delayed_work[_on]()

Workqueue was lacking a mechanism to modify the timeout of an already
pending delayed_work.  delayed_work users have been working around
this using several methods - using an explicit timer + work item,
messing directly with delayed_work->timer, and canceling before
re-queueing, all of which are error-prone and/or ugly.

This patch implements mod_delayed_work[_on]() which behaves similarly
to mod_timer() - if the delayed_work is idle, it's queued with the
given delay; otherwise, its timeout is modified to the new value.
Zero @delay guarantees immediate execution.

v2: Updated to reflect try_to_grab_pending() changes.  Now safe to be
    called from bh context.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
---

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