linux-kernel - Re: [PATCH v6 2/4] block: add runtime pm helpers

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Date:	Mon, 7 Jan 2013 12:15:38 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Aaron Lu <aaron.lu@...el.com>
cc:	Jens Axboe <axboe@...nel.dk>, "Rafael J. Wysocki" <rjw@...k.pl>,
	James Bottomley <James.Bottomley@...senpartnership.com>,
	<linux-pm@...r.kernel.org>, <linux-scsi@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Aaron Lu <aaron.lwe@...il.com>,
	Shane Huang <shane.huang@....com>
Subject: Re: [PATCH v6 2/4] block: add runtime pm helpers

On Sun, 6 Jan 2013, Aaron Lu wrote:

> From: Lin Ming <ming.m.lin@...el.com>
> 
> Add runtime pm helper functions:
> 
> void blk_pm_runtime_init(struct request_queue *q, struct device *dev)
>   - Initialization function for drivers to call.
> 
> int blk_pre_runtime_suspend(struct request_queue *q)
>   - If any requests are in the queue, return -EBUSY.
>     Otherwise set q->rpm_status to RPM_SUSPENDING and return 0.
> 
> void blk_post_runtime_suspend(struct request_queue *q, int err)
>   - If the suspend succeeded then set q->rpm_status to RPM_SUSPENDED.
>     Otherwise set it to RPM_ACTIVE.
> 
> void blk_pre_runtime_resume(struct request_queue *q)
>   - Set q->rpm_status to RPM_RESUMING.
> 
> void blk_post_runtime_resume(struct request_queue *q, int err)
>   - If the resume succeeded then set q->rpm_status to RPM_ACTIVE
>     and call __blk_run_queue.
>     Otherwise set q->rpm_status to RPM_SUSPENDED.
> 
> [aaron.lu@...el.com: do not touch last busy in these helper functions]
> Signed-off-by: Lin Ming <ming.m.lin@...el.com>
> Signed-off-by: Aaron Lu <aaron.lu@...el.com>

> --- a/include/linux/blkdev.h
> +++ b/include/linux/blkdev.h
> @@ -19,6 +19,7 @@
>  #include <linux/gfp.h>
>  #include <linux/bsg.h>
>  #include <linux/smp.h>
> +#include <linux/pm_runtime.h>

This doesn't belong here.  Clients of the block layer don't need to 
know about pm_runtime.h.  Move this #include to block/blk-core.c.

Alan Stern


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