linux-kernel - Re: [PATCHv2 3/3] fpga manager: Adding FPGA Manager support for Xilinx Zynq 7000

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Date:	Thu, 22 Oct 2015 12:56:51 -0500
From:	atull <atull@...nsource.altera.com>
To:	Moritz Fischer <moritz.fischer@...us.com>
CC:	<michal.simek@...inx.com>, <robh+dt@...nel.org>,
	<pawel.moll@....com>, <mark.rutland@....com>,
	<ijc+devicetree@...lion.org.uk>, <galak@...eaurora.org>,
	<soren.brinkmann@...inx.com>, <linux@....linux.org.uk>,
	<gregkh@...uxfoundation.org>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv2 3/3] fpga manager: Adding FPGA Manager support for
 Xilinx Zynq 7000

On Fri, 16 Oct 2015, Moritz Fischer wrote:

Hi Moritz,

I just noticed a problem regarding private data.  Fortunately
it is easy to fix.  See below...

> +static int zynq_fpga_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct zynq_fpga_priv *priv;
> +	struct resource *res;
> +	int err;
> +
> +	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> +	if (!priv)
> +		return -ENOMEM;
> +
> +	platform_set_drvdata(pdev, priv);

fpga-mgr.c uses drvdata for its struct fpga_manager, so this will
get overwritten.  So remove this platform_set_drvdata().  priv
is saved in struct fpga_manager during fpga_mgr_register().

...

> +static int zynq_fpga_remove(struct platform_device *pdev)
> +{

Here you can get a pointer to priv from the fpga_manager struct:
        struct fpga_manager *mgr = platform_get_drvdata(pdev);
        struct zynq_fpga_priv *priv = mgr->priv;

Alan

> +	struct zynq_fpga_priv *priv;
> +
> +	fpga_mgr_unregister(&pdev->dev);
> +
> +	priv = platform_get_drvdata(pdev);
> +
> +	clk_disable_unprepare(priv->clk);
> +
> +	return 0;
> +}
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