linux-kernel - Re: [PATCH v2 3/5] mmc: mediatek: Add PM support for MMC driver

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <20150420065229.GP4946@pengutronix.de>
Date:	Mon, 20 Apr 2015 08:52:29 +0200
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Chaotian Jing <chaotian.jing@...iatek.com>
Cc:	Rob Herring <robh+dt@...nel.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Chris Ball <chris@...ntf.net>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Mark Rutland <mark.rutland@....com>,
	James Liao <jamesjj.liao@...iatek.com>,
	srv_heupstream@...iatek.com, Arnd Bergmann <arnd@...db.de>,
	devicetree@...r.kernel.org,
	Hongzhou Yang <hongzhou.yang@...iatek.com>,
	Catalin Marinas <catalin.marinas@....com>,
	bin.zhang@...iatek.com, linux-mmc@...r.kernel.org,
	linux-kernel@...r.kernel.org, Will Deacon <will.deacon@....com>,
	linux-gpio@...r.kernel.org, linux-mediatek@...ts.infradead.org,
	Sascha Hauer <kernel@...gutronix.de>,
	"Joe.C" <yingjoe.chen@...iatek.com>,
	Eddie Huang <eddie.huang@...iatek.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 3/5] mmc: mediatek: Add PM support for MMC driver

On Tue, Mar 17, 2015 at 11:13:53AM +0800, Chaotian Jing wrote:
> Add PM support for Mediatek MMC driver
> 
> Signed-off-by: Chaotian Jing <chaotian.jing@...iatek.com>
> ---
>  drivers/mmc/host/mtk-sd.c | 94 ++++++++++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 93 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
> index 86c999b..e02f6a6 100644
> --- a/drivers/mmc/host/mtk-sd.c
> +++ b/drivers/mmc/host/mtk-sd.c
> @@ -1186,6 +1232,8 @@ static void msdc_ops_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
>  	int ret;
>  	u32 ddr = 0;
>  
> +	pm_runtime_get_sync(host->dev);
> +
>  	if (ios->timing == MMC_TIMING_UHS_DDR50)
>  		ddr = 1;
>  
> @@ -1230,6 +1278,9 @@ static void msdc_ops_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
>  
>  	if (host->mclk != ios->clock || host->ddr != ddr)
>  		msdc_set_mclk(host, ddr, ios->clock);
> +
> +	pm_runtime_mark_last_busy(host->dev);
> +	pm_runtime_put_autosuspend(host->dev);

This may also be imbalanced. This function can return between
pm_runtime_get_sync() and pm_runtime_put_autosuspend().

Sascha

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/