linux-kernel - Re: [PATCH v2 1/2] mmc: dw_mmc: Handle late vmmc regulators with EPROBE

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Date:	Thu, 27 Jun 2013 12:44:38 -0400
From:	Chris Ball <cjb@...top.org>
To:	Doug Anderson <dianders@...omium.org>
Cc:	Olof Johansson <olof@...om.net>,
	Andrew Bresticker <abrestic@...omium.org>,
	Alim Akhtar <alim.akhtar@...sung.com>,
	Abhilash Kesavan <a.kesavan@...sung.com>,
	Tomasz Figa <tomasz.figa@...il.com>,
	Jaehoon Chung <jh80.chung@...sung.com>,
	Seungwon Jeon <tgih.jun@...sung.com>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Rob Landley <rob@...dley.net>,
	Will Newton <will.newton@...il.com>,
	devicetree-discuss@...ts.ozlabs.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org
Subject: Re: [PATCH v2 1/2] mmc: dw_mmc: Handle late vmmc regulators with EPROBE_DEFER

Hi Doug,

On Fri, Jun 07 2013, Doug Anderson wrote:
> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
> index bc3a1bc..ab5642d 100644
> --- a/drivers/mmc/host/dw_mmc.c
> +++ b/drivers/mmc/host/dw_mmc.c
> @@ -1895,7 +1895,7 @@ static int dw_mci_init_slot(struct dw_mci *host, unsigned int id)
>  	struct mmc_host *mmc;
>  	struct dw_mci_slot *slot;
>  	const struct dw_mci_drv_data *drv_data = host->drv_data;
> -	int ctrl_id, ret;
> +	int ctrl_id;
>  	u8 bus_width;
>  
>  	mmc = mmc_alloc_host(sizeof(struct dw_mci_slot), host->dev);
> @@ -1985,19 +1985,6 @@ static int dw_mci_init_slot(struct dw_mci *host, unsigned int id)
>  #endif /* CONFIG_MMC_DW_IDMAC */
>  	}
>  
> -	host->vmmc = devm_regulator_get(mmc_dev(mmc), "vmmc");
> -	if (IS_ERR(host->vmmc)) {
> -		pr_info("%s: no vmmc regulator found\n", mmc_hostname(mmc));
> -		host->vmmc = NULL;
> -	} else {
> -		ret = regulator_enable(host->vmmc);
> -		if (ret) {
> -			dev_err(host->dev,
> -				"failed to enable regulator: %d\n", ret);
> -			goto err_setup_bus;
> -		}
> -	}
> -
>  	if (dw_mci_get_cd(mmc))
>  		set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
>  	else
> @@ -2023,10 +2010,6 @@ static int dw_mci_init_slot(struct dw_mci *host, unsigned int id)
>  	queue_work(host->card_workqueue, &host->card_work);
>  
>  	return 0;
> -
> -err_setup_bus:
> -	mmc_free_host(mmc);
> -	return -EINVAL;
>  }
>  
>  static void dw_mci_cleanup_slot(struct dw_mci_slot *slot, unsigned int id)

This hunk breaks the build for me, because err_setup_bus and ret are
used in the error path of the call to mmc_add_host() in this function.

I'll push a version that leaves those in.  Let me know if you think
something strange is happening that made this work okay for you, like
a mismerge.

- Chris.
-- 
Chris Ball   <cjb@...top.org>   <http://printf.net/>
One Laptop Per Child
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