linux-kernel - Re: [PATCH] Revert "driver core: synchronize device shutdown"

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Message-ID: <20140305043858.GA2494@kroah.com>
Date:	Tue, 4 Mar 2014 20:38:58 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Roland Dreier <roland@...nel.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>, shli@...nel.org
Subject: Re: [PATCH] Revert "driver core: synchronize device shutdown"

On Tue, Mar 04, 2014 at 08:15:36PM -0800, Roland Dreier wrote:
> > Hm, no one seems to have said anything for the past 5 years about this.
> 
> It definitely is hard to hit -- you have to do "shutdown" or "reboot"
> right as something schedules async work.  In our case we have some
> systems with a large and slightly flaky SAS fabric, so there's a
> constant level of re-probing SCSI disks, and we occasionally see
> reboots hanging due to waiting for never-finishing sd probe async
> work.
> 
> AFAICT the synchronization does nothing useful and is just a remnant
> of a patch series where the real meat didn't get applied.  But of
> course it would be great if Shaohua could confirm my understanding.

Shaohua's email address seems to now bounce :(

Arjan, any thoughts?

greg k-h
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