linux-kernel - Re: [PATCH v2 06/12] mmc: sdhci-of-at91: use sdhci_pltfm

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Date:	Wed, 6 Jan 2016 10:02:15 +0100
From:	Ludovic Desroches <ludovic.desroches@...el.com>
To:	Jisheng Zhang <jszhang@...vell.com>
CC:	<ulf.hansson@...aro.org>, <arnd@...db.de>, <swarren@...dotorg.org>,
	<lee@...nel.org>, <eric@...olt.net>, <michal.simek@...inx.com>,
	<soren.brinkmann@...inx.com>, <ludovic.desroches@...el.com>,
	<srinivas.kandagatla@...il.com>, <maxime.coquelin@...com>,
	<patrice.chotard@...com>, <thierry.reding@...il.com>,
	<sebastian.hesselbarth@...il.com>, <linux-mmc@...r.kernel.org>,
	<linux-rpi-kernel@...ts.infradead.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <kernel@...inux.com>,
	<linux-tegra@...r.kernel.org>
Subject: Re: [PATCH v2 06/12] mmc: sdhci-of-at91: use sdhci_pltfm_init for
 private allocation

Hi Jisheng,

Thanks for your patch but it needs to be updated since it breaks this
driver.

-       struct sdhci_at91_priv  *priv = pltfm_host->priv;
+       struct sdhci_at91_priv  *priv = sdhci_pltfm_priv(pltfm_host);

is missing in sdhci_at91_runtime_suspend and sdhci_at91_runtime_resume
causing a NULL pointer dereference.

On Wed, Jan 06, 2016 at 11:55:59AM +0800, Jisheng Zhang wrote:
> Commit 0e748234293f ("mmc: sdhci: Add size for caller in init+register")
> allows users of sdhci_pltfm to allocate private space in calls to
> sdhci_pltfm_init+sdhci_pltfm_register. This patch migrates the
> sdhci-of-at91 driver to this allocation.
> 
> Signed-off-by: Jisheng Zhang <jszhang@...vell.com>
> Acked-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/mmc/host/sdhci-of-at91.c | 21 ++++++++-------------
>  1 file changed, 8 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci-of-at91.c b/drivers/mmc/host/sdhci-of-at91.c
> index 06d0b50..765eb09 100644
> --- a/drivers/mmc/host/sdhci-of-at91.c
> +++ b/drivers/mmc/host/sdhci-of-at91.c
> @@ -68,11 +68,13 @@ static int sdhci_at91_probe(struct platform_device *pdev)
>  		return -EINVAL;
>  	soc_data = match->data;
>  
> -	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
> -	if (!priv) {
> -		dev_err(&pdev->dev, "unable to allocate private data\n");
> -		return -ENOMEM;
> -	}
> +	host = sdhci_pltfm_init(pdev, soc_data,
> +				sizeof(*priv));

Can be on the same line.

Regards

Ludovic

> +	if (IS_ERR(host))
> +		return PTR_ERR(host);
> +
> +	pltfm_host = sdhci_priv(host);
> +	priv = sdhci_pltfm_priv(pltfm_host);
>  
>  	priv->mainck = devm_clk_get(&pdev->dev, "baseclk");
>  	if (IS_ERR(priv->mainck)) {
> @@ -92,10 +94,6 @@ static int sdhci_at91_probe(struct platform_device *pdev)
>  		return PTR_ERR(priv->gck);
>  	}
>  
> -	host = sdhci_pltfm_init(pdev, soc_data, 0);
> -	if (IS_ERR(host))
> -		return PTR_ERR(host);
> -
>  	/*
>  	 * The mult clock is provided by as a generated clock by the PMC
>  	 * controller. In order to set the rate of gck, we have to get the
> @@ -135,9 +133,6 @@ static int sdhci_at91_probe(struct platform_device *pdev)
>  	clk_prepare_enable(priv->mainck);
>  	clk_prepare_enable(priv->gck);
>  
> -	pltfm_host = sdhci_priv(host);
> -	pltfm_host->priv = priv;
> -
>  	ret = mmc_of_parse(host->mmc);
>  	if (ret)
>  		goto clocks_disable_unprepare;
> @@ -163,7 +158,7 @@ static int sdhci_at91_remove(struct platform_device *pdev)
>  {
>  	struct sdhci_host	*host = platform_get_drvdata(pdev);
>  	struct sdhci_pltfm_host	*pltfm_host = sdhci_priv(host);
> -	struct sdhci_at91_priv	*priv = pltfm_host->priv;
> +	struct sdhci_at91_priv	*priv = sdhci_pltfm_priv(pltfm_host);
>  
>  	sdhci_pltfm_unregister(pdev);
>  
> -- 
> 2.7.0.rc3
> 
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