linux-kernel - Re: [PATCH 17/21] usb: chipidea: msm: Make platform data driver local instead of global

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Message-ID: <20160629112925.GN25236@shlinux2>
Date:	Wed, 29 Jun 2016 19:29:25 +0800
From:	Peter Chen <hzpeterchen@...il.com>
To:	Stephen Boyd <stephen.boyd@...aro.org>
Cc:	linux-usb@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	Andy Gross <andy.gross@...aro.org>,
	Bjorn Andersson <bjorn.andersson@...aro.org>,
	Neil Armstrong <narmstrong@...libre.com>,
	Arnd Bergmann <arnd@...db.de>, Felipe Balbi <balbi@...nel.org>,
	Peter Chen <peter.chen@....com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 17/21] usb: chipidea: msm: Make platform data driver
 local instead of global

On Sun, Jun 26, 2016 at 12:28:34AM -0700, Stephen Boyd wrote:
> If two devices are probed with this same driver, they'll share
> the same platform data structure, while the chipidea core layer
> writes and modifies it. This can lead to interesting results
> especially if one device is an OTG type chipidea controller and
> another is a host. Let's create a copy of this structure per each
> device instance so that odd things don't happen.
> 
> Cc: Peter Chen <peter.chen@....com>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Signed-off-by: Stephen Boyd <stephen.boyd@...aro.org>
> ---
>  drivers/usb/chipidea/ci_hdrc_msm.c | 19 ++++++++-----------
>  1 file changed, 8 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/usb/chipidea/ci_hdrc_msm.c b/drivers/usb/chipidea/ci_hdrc_msm.c
> index cc6f9b0df9d5..fb4340f02c16 100644
> --- a/drivers/usb/chipidea/ci_hdrc_msm.c
> +++ b/drivers/usb/chipidea/ci_hdrc_msm.c
> @@ -37,6 +37,7 @@ struct ci_hdrc_msm {
>  	struct clk *core_clk;
>  	struct clk *iface_clk;
>  	struct extcon_dev *vbus_edev;
> +	struct ci_hdrc_platform_data pdata;
>  	bool secondary_phy;
>  	bool hsic;
>  	void __iomem *base;
> @@ -79,16 +80,6 @@ static void ci_hdrc_msm_notify_event(struct ci_hdrc *ci, unsigned event)
>  	}
>  }
>  
> -static struct ci_hdrc_platform_data ci_hdrc_msm_platdata = {
> -	.name			= "ci_hdrc_msm",
> -	.capoffset		= DEF_CAPOFFSET,
> -	.flags			= CI_HDRC_REGS_SHARED |
> -				  CI_HDRC_DISABLE_STREAMING |
> -				  CI_HDRC_OVERRIDE_AHB_BURST,
> -
> -	.notify_event		= ci_hdrc_msm_notify_event,
> -};
> -
>  static int ci_hdrc_msm_mux_phy(struct ci_hdrc_msm *ci,
>  			       struct platform_device *pdev)
>  {
> @@ -151,6 +142,12 @@ static int ci_hdrc_msm_probe(struct platform_device *pdev)
>  		return -ENOMEM;
>  	platform_set_drvdata(pdev, ci);
>  
> +	ci->pdata.name = "ci_hdrc_msm";
> +	ci->pdata.capoffset = DEF_CAPOFFSET;
> +	ci->pdata.flags	= CI_HDRC_REGS_SHARED | CI_HDRC_DISABLE_STREAMING |
> +			  CI_HDRC_OVERRIDE_AHB_BURST;
> +	ci->pdata.notify_event = ci_hdrc_msm_notify_event;
> +
>  	reset = devm_reset_control_get(&pdev->dev, "core");
>  	if (IS_ERR(reset))
>  		return PTR_ERR(reset);
> @@ -204,7 +201,7 @@ static int ci_hdrc_msm_probe(struct platform_device *pdev)
>  	of_node_put(ulpi_node);
>  
>  	plat_ci = ci_hdrc_add_device(&pdev->dev, pdev->resource,
> -				     pdev->num_resources, &ci_hdrc_msm_platdata);
> +				     pdev->num_resources, &ci->pdata);
>  	if (IS_ERR(plat_ci)) {
>  		dev_err(&pdev->dev, "ci_hdrc_add_device failed!\n");
>  		ret = PTR_ERR(plat_ci);

You can do something like ci_hdrc_usb2.c, it looks simpler. 

-- 

Best Regards,
Peter Chen