Re: [RFC PATCH] cifs: Fix possible deadlock with cifs and work queues

[Steven Rostedt]

On Fri, 21 Mar 2014 12:32:12 +0400
Pavel Shilovsky <piastry@xxxxxxxxxxx> wrote:


> Read and write codepaths both obtain lock_sem for read and then wait
> for cifsiod_wq to complete and release lock_sem. They don't do any
> lock_sem operations inside their work task queued to cifsiod_wq. But
> oplock code can obtain/release lock_sem in its work task. So, that's
> why I agree with Jeff and suggest to move the oplock code to a
> different work queue (cifsioopd_wq?) but leave read and write
> codepaths use cifsiod_wq.

OK, how about I submit a second patch that moves the reader and writer
to its own "safe" workqueue?

-- Steve

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