From: Oliver Neukum <oneukum@suse.com>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: Tejun Heo <tj@kernel.org>,
Kernel development list <linux-kernel@vger.kernel.org>,
USB list <linux-usb@vger.kernel.org>
Subject: Re: [RFC] deadlock with flush_work() in UAS
Date: Mon, 01 Jul 2019 13:02:27 +0200 [thread overview]
Message-ID: <1561978947.10014.12.camel@suse.com> (raw)
In-Reply-To: <Pine.LNX.4.44L0.1906261036550.1550-100000@iolanthe.rowland.org>
Am Mittwoch, den 26.06.2019, 10:38 -0400 schrieb Alan Stern:
> 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.
Are you sure? What about hub_tt_work? As far as I can tell, hub_quiesce
will flush it, hence it is used in error handling.
Regards
Oliver
next prev parent reply other threads:[~2019-07-01 11:16 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-18 14:53 [RFC] deadlock with flush_work() in UAS Oliver Neukum
2019-06-18 15:29 ` Alan Stern
2019-06-18 15:29 ` Oliver Neukum
2019-06-18 15:59 ` Alan Stern
2019-06-20 14:10 ` Tejun Heo
2019-06-24 8:56 ` Oliver Neukum
2019-06-24 14:22 ` Alan Stern
2019-06-26 8:10 ` Oliver Neukum
2019-06-26 14:38 ` Alan Stern
2019-07-01 11:02 ` Oliver Neukum [this message]
2019-07-01 14:20 ` Alan Stern
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