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

Peter Chen
2016-06-29T11:36:27Z

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@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 | 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