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Date:   Wed, 26 Jun 2019 10:38:57 -0400 (EDT)
From:   Alan Stern <>
To:     Oliver Neukum <>
cc:     Tejun Heo <>,
        Kernel development list <>,
        USB list <>
Subject: Re: [RFC] deadlock with flush_work() in UAS

On Wed, 26 Jun 2019, Oliver Neukum wrote:

> Am Montag, den 24.06.2019, 10:22 -0400 schrieb Alan Stern:
> > But that pattern makes no sense; a driver would never use it.  The 
> > driver would just do the reset itself.
> Correct. But UAS and storage themselves still need to use
> WQ_MEM_RECLAIM for their workqueues, don't they?

Perhaps so for uas.  usb-storage uses a work queue only for scanning 
targets, which doesn't interfere with the block I/O pathway.

Alan Stern

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