Re: USB device cannot be reconnected and khubd "blocked for more than120 seconds"

[Linus Torvalds]

On Tue, Jan 15, 2013 at 10:32 AM, Tejun Heo <tj@xxxxxxxxxx> wrote:
>
> I think the root problem here, apart from request_module() from block
> - which is a bit nasty but making that part completely async would too
> be quite nasty albeit in a different way - is that
> async_synchronize_full() is way too indescriminate.  It's something
> only suitable for things like the end of system init.
>
> I'm wondering whether what we need is a rudimentray nesting like the
> following.

I think that is a good solution if it works, but look out: we need to
synchronize across *all* domains, not just the default one.  The sd.c
code, for example, uses its own "scsi_sd_probe_domain" for example,
and we *do* want to synchronize with it.

Can you do that with your suggested interface (ie it would have to be
a *global* sequence number).

               Linus
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