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usb: dwc3: use local copy of resource to fix-up register offset

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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@socionext.com>
Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Masahiro Yamada 2018-04-19 20:03:37 +09:00 committed by Felipe Balbi
parent 1ef6c42afc
commit 44feb8e6ea
1 changed files with 8 additions and 24 deletions
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32
drivers/usb/dwc3/core.c
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@ -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 @@ err1:
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);