linux-kernel - Re: [RFC][PATCH] PM: Introduce core framework for run-time PM of I/O devices (rev. 8)

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Date:	Fri, 10 Jul 2009 01:22:40 +0200
From:	Pavel Machek <pavel@....cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Linux-pm mailing list <linux-pm@...ts.linux-foundation.org>,
	Greg KH <gregkh@...e.de>, LKML <linux-kernel@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [RFC][PATCH] PM: Introduce core framework for run-time PM of
	I/O devices (rev. 8)

hi!

> +/**
> + * Device run-time power management request types.
> + *
> + * RPM_REQ_NONE		Do nothing.
> + *
> + * RPM_REQ_IDLE		Run the device bus type's ->runtime_idle() callback
> + *
> + * RPM_REQ_SUSPEND	Run the device bus type's ->runtime_suspend() callback
> + *
> + * RPM_REQ_RESUME	Run the device bus type's ->runtime_resume() callback
> + */
> +
> +enum rpm_request {
> +	RPM_REQ_NONE = 0,
> +	RPM_REQ_IDLE,
> +	RPM_REQ_SUSPEND,
> +	RPM_REQ_RESUME,
> +};
> +
>  struct dev_pm_info {
>  	pm_message_t		power_state;
> -	unsigned		can_wakeup:1;
> -	unsigned		should_wakeup:1;
> +	unsigned int		can_wakeup:1;
> +	unsigned int		should_wakeup:1;
>  	enum dpm_state		status;		/* Owned by the PM core */
> -#ifdef	CONFIG_PM_SLEEP
> +#ifdef CONFIG_PM_SLEEP
>  	struct list_head	entry;
>  #endif
> +#ifdef CONFIG_PM_RUNTIME
> +	struct timer_list	suspend_timer;
> +	unsigned long		timer_expires;
> +	struct work_struct	work;
> +	wait_queue_head_t	wait_queue;
> +	spinlock_t		lock;
> +	atomic_t		usage_count;
> +	atomic_t		child_count;
> +	unsigned int		ignore_children:1;
> +	unsigned int		runtime_disabled:1;
> +	unsigned int		runtime_failure:1;
> +	unsigned int		idle_notification:1;
> +	unsigned int		request_pending:1;
> +	unsigned int		deferred_resume:1;
> +	enum rpm_request	request;
> +	enum rpm_status		runtime_status;

runtime_status seems to be accessed outside spinlocks. Should it be of
type atomic_t?


-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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