kthread_work: wake up worker only when the worker is idle

If the worker is already executing a work item when another is queued,
we can safely skip wakeup without worrying about stalling queue thus
avoiding waking up the busy worker spuriously.  Spurious wakeups
should be fine but still isn't nice and avoiding it is trivial here.

tj: Updated description.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
Sound Control: add line gain to cached and register lock

bump version to 3.6

Signed-off-by: Paul Reioux <reioux@gmail.com>
intelli-thermal v2: initial adaptation

Intellithermal 2.0 is based on the latest Qualcomm thermal driver adapted for
in-kernel use and control.  Newer MSM8974+ chipsets should use this driver
going forward.

Modifications copyright Paul Reioux 2014

Signed-off-by: Paul Reioux <reioux@gmail.com>