> From: Ivan T. Ivanov
> Sent: Thursday, July 25, 2013 9:27 AM
>
> When deferred probe happens driver will try to ioremap multiple times
> and will fail. Memory resource.start variable is a global variable,
> modifications in this field will be accumulated on every probe.
> Fix this by moving the above operations after driver hold all
> required PHY's.
>
> Signed-off-by: Ivan T. Ivanov <iivanov@xxxxxxxxxx>
> ---
> drivers/usb/dwc3/core.c | 31 ++++++++++++++++---------------
> 1 file changed, 16 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index 607bef8..50c833f 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -384,21 +384,6 @@ static int dwc3_probe(struct platform_device *pdev)
> dev_err(dev, "missing memory resource\n");
> return -ENODEV;
> }
> - dwc->xhci_resources[0].start = res->start;
> - dwc->xhci_resources[0].end = dwc->xhci_resources[0].start +
> - DWC3_XHCI_REGS_END;
> - 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))
> - return PTR_ERR(regs);
>
> if (node) {
> dwc->maximum_speed = of_usb_get_maximum_speed(node);
> @@ -452,6 +437,22 @@ static int dwc3_probe(struct platform_device *pdev)
> return -EPROBE_DEFER;
> }
>
> + dwc->xhci_resources[0].start = res->start;
> + dwc->xhci_resources[0].end = dwc->xhci_resources[0].start +
> + DWC3_XHCI_REGS_END;
> + dwc->xhci_resources[0].flags = res->flags;
> + dwc->xhci_resources[0].name = res->name;
> +
> + res->start += DWC3_GLOBALS_REGS_START;
Ick. The driver is modifying the struct resource passed to it by the
platform code? That seems like a layering violation, and is fragile as
hell. In addition to this bug, what would happen if the struct resource
was declared 'const'?
--
Paul
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