Hi, On Fri, Feb 21, 2014 at 02:41:03PM +0100, Michal Simek wrote: > >>> + /* Map the registers */ > >>> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > >>> + udc->base_address = devm_ioremap_nocache(&pdev->dev, res->start, > >>> + resource_size(res)); > >> > >> use devm_ioremap_resource() instead. > > > > Also, res might be NULL. You should check that before dereferencing it. > > yes it is necessary for both cases with devm_ioremap_nocache > or with devm_ioremap_resource.
read the source Luke:
| void __iomem *devm_ioremap_resource(struct device *dev, struct resource *res)
| {
| resource_size_t size;
| const char *name;
| void __iomem *dest_ptr;
|
| BUG_ON(!dev);
|
| if (!res || resource_type(res) != IORESOURCE_MEM) {
^^^^
already done for you
| dev_err(dev, "invalid resource\n");
| return ERR_PTR(-EINVAL);
| }
|
| size = resource_size(res);
| name = res->name ?: dev_name(dev);
|
| if (!devm_request_mem_region(dev, res->start, size, name)) {
| dev_err(dev, "can't request region for resource %pR\n", res);
| return ERR_PTR(-EBUSY);
| }
|
| if (res->flags & IORESOURCE_CACHEABLE)
| dest_ptr = devm_ioremap(dev, res->start, size);
| else
| dest_ptr = devm_ioremap_nocache(dev, res->start, size);
|
| if (!dest_ptr) {
| dev_err(dev, "ioremap failed for resource %pR\n", res);
| devm_release_mem_region(dev, res->start, size);
| dest_ptr = ERR_PTR(-ENOMEM);
| }
|
| return dest_ptr;
| }
--
balbi
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