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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