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Date: Tue, 21 Aug 2018 10:27:11 -0700 From: Tejun Heo <tj@...nel.org> To: Johannes Berg <johannes@...solutions.net> Cc: Lai Jiangshan <jiangshanlai@...il.com>, linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org Subject: Re: [PATCH 1/2] workqueue: skip lockdep wq dependency in cancel_work_sync() Hello, Johannes. On Tue, Aug 21, 2018 at 07:18:14PM +0200, Johannes Berg wrote: > > But this can lead to a deadlock. I'd much rather err on the side of > > discouraging complex lock dancing around ordered workqueues, no? > > What can lead to a deadlock? Oh not this particular case, but I was wondering whether we'd be missing legitimate possible deadlock cases by skipping lockdep for all cancel_work_sync()'s as they can actually flush. Thanks. -- tejun
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