linux-kernel - Re: System hangs if NVMe/SSD is removed during suspend

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Message-ID: <20191004080340.GB2819@lahna.fi.intel.com>
Date:   Fri, 4 Oct 2019 11:03:40 +0300
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     Tejun Heo <tj@...nel.org>
Cc:     "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        AceLan Kao <acelan.kao@...onical.com>,
        Jens Axboe <axboe@...nel.dk>, Jan Kara <jack@...e.cz>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Subject: Re: System hangs if NVMe/SSD is removed during suspend

On Thu, Oct 03, 2019 at 09:50:33AM -0700, Tejun Heo wrote:
> Hello, Mika.
> 
> On Wed, Oct 02, 2019 at 03:21:36PM +0300, Mika Westerberg wrote:
> > but from that discussion I don't see more generic solution to be
> > implemented.
> > 
> > Any ideas we should fix this properly?
> 
> Yeah, the only fix I can think of is not using freezable wq.  It's
> just not a good idea and not all that difficult to avoid using.

OK, thanks.

In that case I will just make a patch that removes WQ_FREEZABLE from
bdi_wq and see what people think about it :)