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

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Message-ID: <Pine.LNX.4.44L0.0801061729080.19222-100000@netrider.rowland.org>
Date:	Sun, 6 Jan 2008 17:31:32 -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 Sun, 6 Jan 2008, Rafael J. Wysocki wrote:

> Still, our present approach doesn't seem to be correct overall.  For example,
> I think we should prevent a suspend from happening while a device is being
> removed.

We could, however I don't think it's dangerous to allow it.  The two
problems to avoid are (1) messing up the PM device list pointers, and
(2) calling a driver's suspend/resume methods while its remove method
is running.  (1) is handled by the pm_list_mutex and (2) is handled by
locking dev->sem.

Alan Stern

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