linux-kernel - Re: [PATCH v2 1/2] usb: dwc3: use local copy of resource to fix-up register offset

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Date:   Tue, 1 May 2018 23:07:11 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     linux-usb@...r.kernel.org,
        Felipe Balbi <felipe.balbi@...ux.intel.com>
Cc:     Rob Herring <robh@...nel.org>, Roger Quadros <rogerq@...com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Jassi Brar <jaswinder.singh@...aro.org>,
        Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Felipe Balbi <balbi@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] usb: dwc3: use local copy of resource to fix-up
 register offset

Hi Felipe,


2018-04-19 20:03 GMT+09:00 Masahiro Yamada <yamada.masahiro@...ionext.com>:
> It is not a good idea to directly modify the resource of a platform
> device.  Modify its local copy, and pass it to devm_ioremap_resource()
> so that we do not need to restore it in the failure path and the remove
> hook.
>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
> Reviewed-by: Masami Hiramatsu <mhiramat@...nel.org>


I want this patch applied first
unless you are opposed to this clean-up.

I'd like to avoid re-sending a trivial patch like this.




> ---
>
> Changes in v2: None
>
>  drivers/usb/dwc3/core.c | 32 ++++++++------------------------
>  1 file changed, 8 insertions(+), 24 deletions(-)
>
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index a15648d..8e66edd 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -1245,7 +1245,7 @@ static void dwc3_check_params(struct dwc3 *dwc)
>  static int dwc3_probe(struct platform_device *pdev)
>  {
>         struct device           *dev = &pdev->dev;
> -       struct resource         *res;
> +       struct resource         *res, dwc_res;
>         struct dwc3             *dwc;
>
>         int                     ret;
> @@ -1270,20 +1270,19 @@ static int dwc3_probe(struct platform_device *pdev)
>         dwc->xhci_resources[0].flags = res->flags;
>         dwc->xhci_resources[0].name = res->name;
>
> -       res->start += DWC3_GLOBALS_REGS_START;
> -
>         /*
>          * Request memory region but exclude xHCI regs,
>          * since it will be requested by the xhci-plat driver.
>          */
> -       regs = devm_ioremap_resource(dev, res);
> -       if (IS_ERR(regs)) {
> -               ret = PTR_ERR(regs);
> -               goto err0;
> -       }
> +       dwc_res = *res;
> +       dwc_res.start += DWC3_GLOBALS_REGS_START;
> +
> +       regs = devm_ioremap_resource(dev, &dwc_res);
> +       if (IS_ERR(regs))
> +               return PTR_ERR(regs);
>
>         dwc->regs       = regs;
> -       dwc->regs_size  = resource_size(res);
> +       dwc->regs_size  = resource_size(&dwc_res);
>
>         dwc3_get_properties(dwc);
>
> @@ -1350,29 +1349,14 @@ static int dwc3_probe(struct platform_device *pdev)
>         pm_runtime_put_sync(&pdev->dev);
>         pm_runtime_disable(&pdev->dev);
>
> -err0:
> -       /*
> -        * restore res->start back to its original value so that, in case the
> -        * probe is deferred, we don't end up getting error in request the
> -        * memory region the next time probe is called.
> -        */
> -       res->start -= DWC3_GLOBALS_REGS_START;
> -
>         return ret;
>  }
>
>  static int dwc3_remove(struct platform_device *pdev)
>  {
>         struct dwc3     *dwc = platform_get_drvdata(pdev);
> -       struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>
>         pm_runtime_get_sync(&pdev->dev);
> -       /*
> -        * restore res->start back to its original value so that, in case the
> -        * probe is deferred, we don't end up getting error in request the
> -        * memory region the next time probe is called.
> -        */
> -       res->start -= DWC3_GLOBALS_REGS_START;
>
>         dwc3_debugfs_exit(dwc);
>         dwc3_core_exit_mode(dwc);
> --
> 2.7.4
>
> --
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-- 
Best Regards
Masahiro Yamada