linux-kernel - Re: [PATCH v2] PM: runtime: add might

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Date:	Tue, 26 Jul 2011 17:26:42 -0700
From:	Kevin Hilman <khilman@...com>
To:	Colin Cross <ccross@...roid.com>
Cc:	linux-pm@...ts.linux-foundation.org,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-kernel@...r.kernel.org,
	Nishanth Menon <nm@...com>,
	Alan Stern <stern@...land.harvard.edu>
Subject: Re: [PATCH v2] PM: runtime: add might_sleep to PM runtime functions

Colin Cross <ccross@...roid.com> writes:

> Some of the entry points to pm runtime are not safe to
> call in atomic context unless pm_runtime_irq_safe() has
> been called.  Inspecting the code, it is not immediately
> obvious that the functions sleep at all, as they run
> inside a spin_lock_irqsave, but under some conditions
> they can drop the lock and turn on irqs.
>
> If a driver incorrectly calls the pm_runtime apis, it can
> cause sleeping and irq processing when it expects to stay
> in atomic context.
>
> Add might_sleep_if to all the __pm_runtime_* entry points
> to enforce correct usage.

Minor: s/all/most of/, or something similar since in v2, it doesn't
annotate all of the functions anymore, just the main ones likely to be
(mis)used by drivers.

Other than that, looks good...

> Add pm_runtime_put_sync_autosuspend to the list of
> functions that can be called in atomic context.
>
> Signed-off-by: Colin Cross <ccross@...roid.com>

Reviewed-by: Kevin Hilman <khilman@...com>

Kevin
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