linux-kernel - Re: [PATCH] PM: runtime: add might

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Date:	Sat, 23 Jul 2011 21:41:05 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Colin Cross <ccross@...roid.com>
cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	<linux-pm@...ts.linux-foundation.org>,
	<linux-kernel@...r.kernel.org>, Kevin Hilman <khilman@...com>,
	Nishanth Menon <nm@...com>
Subject: Re: [PATCH] PM: runtime: add might_sleep to PM runtime functions

On Sat, 23 Jul 2011, Colin Cross wrote:

> On Sat, Jul 23, 2011 at 3:57 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> > On Saturday, July 23, 2011, Colin Cross wrote:
> >> The list of functions that can be called in atomic context is
> >> non-intuitive (pm_runtime_put_sync can not, but
> >> pm_runtime_put_sync_suspend can, if pm_runtime_irq_safe has
> >> been called?).
> >
> > However, this behavior is documented.
> >
> > Also, if you have a clean use case for calling rpm_idle() with interrupts
> > off, it can be modified to work in analogy with rpm_suspend() in that respect.
> 
> Yes, Kevin posted that patch in response to a bug that would never
> have existed with this patch.  Even with Kevin's change, this patch
> still detects drivers that are missing pm_runtime_irq_safe().

I suggest that adding the annotations to __pm_runtime_idle(),
__pm_runtime_suspend(), and __pm_runtime_resume() is entirely
reasonable.  But the annotations to __pm_runtime_disable() and
__pm_runtime_use_autosuspend() do seem unnecessary.

Alan Stern

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