Re: [PATCH 1/5] workqueue: Allow retrieval of current task's work struct

Tejun Heo
2018-02-12T17:07:47Z

Hello,

On Sun, Feb 11, 2018 at 10:38:28AM +0100, Lukas Wunner wrote:
> Introduce a helper to retrieve the current task's work struct if it is
> a workqueue worker.
>
> This allows us to fix a long-standing deadlock in several DRM drivers
> wherein the ->runtime_suspend callback waits for a specific worker to
> finish and that worker in turn calls a function which waits for runtime
> suspend to finish. That function is invoked from multiple call sites
> and waiting for runtime suspend to finish is the correct thing to do
> except if it's executing in the context of the worker.
>
> Cc: Tejun Heo <tj@kernel.org>
> Cc: Lai Jiangshan <jiangshanlai@gmail.com>
> Cc: Dave Airlie <airlied@redhat.com>
> Cc: Ben Skeggs <bskeggs@redhat.com>
> Cc: Alex Deucher <alexander.deucher@amd.com>
> Signed-off-by: Lukas Wunner <lukas@wunner.de>

I wonder whether it's too generic a name but there are other functions
named in a similar fashion and AFAICS current_work isn't used by
anyone in the tree, so it seems okay.

Acked-by: Tejun Heo <tj@kernel.org>

Please feel free to route as you see fit.

Thanks.

--
tejun
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