Re: [PATCH v3 1/6] md: Make md resync and reshape threads freezable

[Bart Van Assche <Bart.VanAssche@wdc.com>]

On Tue, 2017-09-26 at 06:45 +0800, Ming Lei wrote:
> On Mon, Sep 25, 2017 at 04:22:29PM +0000, Bart Van Assche wrote:
> > On Mon, 2017-09-25 at 10:38 +0800, Ming Lei wrote:
> > > On Fri, Sep 22, 2017 at 03:14:00PM -0700, Bart Van Assche wrote:
> > > > Some people use the md driver on laptops and use the suspend and
> > > > resume functionality. Since it is essential that submitting of
> > > > new I/O requests stops before device quiescing starts, make the
> > > > md resync and reshape threads freezable.
> > > 
> > > Why is this patch part of this patchset? I don't think
> > > MD is special enough wrt. the SCSI quiesce issue.
> > 
> > Because the scope of this patch series is not only to make SCSI quiesce safe
> > but also to avoid that suspend and resume lock up with a storage stack that
> > uses the md driver.
> 
> If SCSI quiesce is safe, there shouldn't be suspend/resume lockup on any
> SCSI device wrt. quiesce, right?

Please reread my e-mail. You misread it. I didn't write that SCSI quiesce is safe.

Bart.