linux-kernel - Re: [PATCH 1/8] PM: Add suspend block api.

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Message-ID: <Pine.LNX.4.44L0.1005061110090.1708-100000@iolanthe.rowland.org>
Date:	Thu, 6 May 2010 11:18:05 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Arve Hjønnevåg <arve@...roid.com>
cc:	Linux-pm mailing list <linux-pm@...ts.linux-foundation.org>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Tejun Heo <tj@...nel.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	Randy Dunlap <rdunlap@...otime.net>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Nigel Cunningham <nigel@...onice.net>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	Ming Lei <tom.leiming@...il.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Maxim Levitsky <maximlevitsky@...il.com>,
	<linux-doc@...r.kernel.org>
Subject: Re: [PATCH 1/8] PM: Add suspend block api.

On Tue, 27 Apr 2010, [UTF-8] Arve HjÃ¸nnevÃ¥g wrote:

> +static void suspend_worker(struct work_struct *work)
> +{
> +	int ret;
> +	int entry_event_num;
> +
> +	enable_suspend_blockers = true;
> +	while (!suspend_is_blocked()) {
> +		entry_event_num = current_event_num;
> +
> +		if (debug_mask & DEBUG_SUSPEND)
> +			pr_info("suspend: enter suspend\n");
> +
> +		ret = pm_suspend(requested_suspend_state);
> +
> +		if (debug_mask & DEBUG_EXIT_SUSPEND)
> +			pr_info_time("suspend: exit suspend, ret = %d ", ret);
> +
> +		if (current_event_num == entry_event_num)
> +			pr_info("suspend: pm_suspend returned with no event\n");
> +	}
> +	enable_suspend_blockers = false;
> +}

Here's a completely new issue.  When using opportunistic suspends on an
SMP system, it could happen that the system gets a wakeup event and
this routine starts running again before the event's IRQ handler has
finished (or has enabled a suspend blocker).  The system would 
re-suspend too soon.

Is there anything in the PM core that waits until all outstanding IRQs 
have been handled before unfreezing processes?  If there is, I can't 
find it.  Should such a thing be added?

Alan Stern

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