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[PATCH v2 17/22] usb: chipidea: msm: Make platform data driver local instead of global

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  [PATCH v2 17/22] usb: chipidea: msm: Make platform data driver local instead of global Stephen Boyd <stephen.boyd@linaro.org> - 2016-07-08 00:30 +0200
    Re: [PATCH v2 17/22] usb: chipidea: msm: Make platform data driver  local instead of global Peter Chen <hzpeterchen@gmail.com> - 2016-07-11 07:40 +0200

#1438976 — [PATCH v2 17/22] usb: chipidea: msm: Make platform data driver local instead of global

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@nxp.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Stephen Boyd <stephen.boyd@linaro.org>
---
 drivers/usb/chipidea/ci_hdrc_msm.c | 20 ++++++++------------
 1 file changed, 8 insertions(+), 12 deletions(-)

diff --git a/drivers/usb/chipidea/ci_hdrc_msm.c b/drivers/usb/chipidea/ci_hdrc_msm.c
index 81437c8cea82..da2d399acdd2 100644
--- a/drivers/usb/chipidea/ci_hdrc_msm.c
+++ b/drivers/usb/chipidea/ci_hdrc_msm.c
@@ -39,6 +39,7 @@ struct ci_hdrc_msm {
 	struct clk *core_clk;
 	struct clk *iface_clk;
 	struct clk *fs_clk;
+	struct ci_hdrc_platform_data pdata;
 	bool secondary_phy;
 	bool hsic;
 	void __iomem *base;
@@ -94,16 +95,6 @@ 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)
 {
@@ -164,7 +155,12 @@ static int ci_hdrc_msm_probe(struct platform_device *pdev)
 	if (IS_ERR(phy))
 		return PTR_ERR(phy);
 
-	ci_hdrc_msm_platdata.usb_phy = phy;
+	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;
+	ci->pdata.usb_phy = phy;
 
 	reset = devm_reset_control_get(&pdev->dev, "core");
 	if (IS_ERR(reset))
@@ -221,7 +217,7 @@ 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);
-- 
2.9.0.rc2.8.ga28705d

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#1440257 — Re: [PATCH v2 17/22] usb: chipidea: msm: Make platform data driver local instead of global

On Thu, Jul 07, 2016 at 03:21:08PM -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@nxp.com>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Signed-off-by: Stephen Boyd <stephen.boyd@linaro.org>
> ---
>  drivers/usb/chipidea/ci_hdrc_msm.c | 20 ++++++++------------
>  1 file changed, 8 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/usb/chipidea/ci_hdrc_msm.c b/drivers/usb/chipidea/ci_hdrc_msm.c
> index 81437c8cea82..da2d399acdd2 100644
> --- a/drivers/usb/chipidea/ci_hdrc_msm.c
> +++ b/drivers/usb/chipidea/ci_hdrc_msm.c
> @@ -39,6 +39,7 @@ struct ci_hdrc_msm {
>  	struct clk *core_clk;
>  	struct clk *iface_clk;
>  	struct clk *fs_clk;
> +	struct ci_hdrc_platform_data pdata;
>  	bool secondary_phy;
>  	bool hsic;
>  	void __iomem *base;
> @@ -94,16 +95,6 @@ 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)
>  {
> @@ -164,7 +155,12 @@ static int ci_hdrc_msm_probe(struct platform_device *pdev)
>  	if (IS_ERR(phy))
>  		return PTR_ERR(phy);
>  
> -	ci_hdrc_msm_platdata.usb_phy = phy;
> +	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;
> +	ci->pdata.usb_phy = phy;
>  
>  	reset = devm_reset_control_get(&pdev->dev, "core");
>  	if (IS_ERR(reset))
> @@ -221,7 +217,7 @@ 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);

Acked-by: Peter Chen <peter.chen@nxp.com>

-- 

Best Regards,
Peter Chen

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