Re: [PATCH for-3.20-fixes] workqueue: fix hang involving racing cancel[_delayed]_work_sync()'s for PREEMPT_NONE

[Rabin Vincent]

On Mon, Feb 09, 2015 at 05:15:27PM +0100, Tejun Heo wrote:
> This patch removes the possible hang by updating __cancel_work_timer()
> to explicitly wait for clearing of CANCELING rather than invoking
> flush_work() after try_to_grab_pending() fails with -ENOENT.  The
> explicit wait uses the matching bit waitqueue for the CANCELING bit.
> 
> Link: http://lkml.kernel.org/g/20150206171156.GA8942@xxxxxxxx
> 
> Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>

Fixes my synthetic test:

Tested-by: Rabin Vincent <rabin.vincent@xxxxxxxx>

Thanks.

/Rabin
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