linux-kernel - Re: [PATCH v1 1/3]mmc: enable runtime PM support for block driver

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Date:	Tue, 30 Nov 2010 20:08:11 +0200
From:	Adrian Hunter <adrian.hunter@...ia.com>
To:	Yunpeng Gao <yunpeng.gao@...el.com>
CC:	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 1/3]mmc: enable runtime PM support for block driver

On 28/11/10 07:48, ext Yunpeng Gao wrote:
>
>> From 51e4d34f19b48552a10a9f6b69f51c5aeed18d03 Mon Sep 17 00:00:00 2001
> From: Yunpeng Gao<yunpeng.gao@...el.com>
> Date: Sun, 28 Nov 2010 08:01:01 +0800
> Subject: [PATCH] Enable runtime pm support for block driver of mmc stack.
>
> Follow the kernel runtime pm framework, this patch enable
> runtime pm support for block driver of mmc stack.
> To validate it, it needs runtime pm support for mmc bus
> and host controller to be enabled also.
>
> Signed-off-by: Yunpeng Gao<yunpeng.gao@...el.com>
> ---
>   drivers/mmc/card/block.c |   24 +++++++++++++++++++++---
>   1 files changed, 21 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
> index 217f820..8a35814 100644
> --- a/drivers/mmc/card/block.c
> +++ b/drivers/mmc/card/block.c
> @@ -31,6 +31,7 @@
>   #include<linux/mutex.h>
>   #include<linux/scatterlist.h>
>   #include<linux/string_helpers.h>
> +#include<linux/pm_runtime.h>
>
>   #include<linux/mmc/card.h>
>   #include<linux/mmc/host.h>
> @@ -560,14 +561,24 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *req)
>
>   static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
>   {
> +	struct mmc_blk_data *md = mq->data;
> +	struct mmc_card *card = md->queue.card;
> +	int ret;
> +
> +	pm_runtime_get_sync(&card->dev);

Wouldn't it be better to "get" when the queue thread wakes up
and "put" before it goes to sleep?

> +
>   	if (req->cmd_flags&  REQ_DISCARD) {
>   		if (req->cmd_flags&  REQ_SECURE)
> -			return mmc_blk_issue_secdiscard_rq(mq, req);
> +			ret = mmc_blk_issue_secdiscard_rq(mq, req);
>   		else
> -			return mmc_blk_issue_discard_rq(mq, req);
> +			ret = mmc_blk_issue_discard_rq(mq, req);
>   	} else {
> -		return mmc_blk_issue_rw_rq(mq, req);
> +		ret = mmc_blk_issue_rw_rq(mq, req);
>   	}
> +
> +	pm_runtime_put(&card->dev);
> +
> +	return ret;
>   }
>
>   static inline int mmc_blk_readonly(struct mmc_card *card)
> @@ -709,6 +720,11 @@ static int mmc_blk_probe(struct mmc_card *card)
>
>   	mmc_set_drvdata(card, md);
>   	add_disk(md->disk);
> +
> +	/* Indicate to runtime PM core that our device is active */
> +	pm_runtime_set_active(&card->dev);
> +	pm_runtime_enable(&card->dev);
> +
>   	return 0;
>
>    out:
> @@ -732,6 +748,8 @@ static void mmc_blk_remove(struct mmc_card *card)
>   		mmc_blk_put(md);
>   	}
>   	mmc_set_drvdata(card, NULL);
> +
> +	pm_runtime_disable(&card->dev);
>   }
>
>   #ifdef CONFIG_PM

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