linux-kernel - Re: [PATCH] PM: Acquire device locks on suspend

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Message-ID: <Pine.LNX.4.44L0.0801051537450.26040-100000@netrider.rowland.org>
Date:	Sat, 5 Jan 2008 15:39:46 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	Greg KH <gregkh@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Len Brown <lenb@...nel.org>, Ingo Molnar <mingo@...e.hu>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>
Subject: Re: [PATCH] PM: Acquire device locks on suspend

On Sat, 5 Jan 2008, Rafael J. Wysocki wrote:

> > Another thing to watch out for: Just in case somebody ends up calling
> > destroy_suspended_device(dev) from within dev's own resume method, you 
> > should interchange the resume_device() and the list_move_tail() 
> > calls in dpm_resume().
> 
> However, if we unregister them all at once after releasing pm_sleep_rwsem,
> that shouldn't be necessary, right?

It's still necessary, because destroy_suspended_device() still has to
move the device from one list to another.  You don't want it to end up 
on the dpm_locked list.

Alan Stern

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