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

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Date:	Sat, 23 Jul 2011 18:48:21 -0700
From:	Colin Cross <ccross@...roid.com>
To:	Alan Stern <stern@...land.harvard.edu>
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, Jul 23, 2011 at 6:41 PM, Alan Stern <stern@...land.harvard.edu> wrote:
> 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.

OK, I'll drop those.
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