reiserfs: delay reiserfs lock until journal initialization

[linux-2.6-block.git] / lib / devres.c

diff --git a/lib/devres.c b/lib/devres.c
index 7c0e953a7486afa4fd5ef9bf98346b4f41e810a9..4fbc09e6e9e6f9a83dbdc14ba99bfb1328bef577 100644 (file)
--- a/lib/devres.c
+++ b/lib/devres.c
@@ -85,6 +85,57 @@ void devm_iounmap(struct device *dev, void __iomem *addr)
 }
 EXPORT_SYMBOL(devm_iounmap);
 
+/**
+ * devm_request_and_ioremap() - Check, request region, and ioremap resource
+ * @dev: Generic device to handle the resource for
+ * @res: resource to be handled
+ *
+ * Takes all necessary steps to ioremap a mem resource. Uses managed device, so
+ * everything is undone on driver detach. Checks arguments, so you can feed
+ * it the result from e.g. platform_get_resource() directly. Returns the
+ * remapped pointer or NULL on error. Usage example:
+ *
+ *     res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ *     base = devm_request_and_ioremap(&pdev->dev, res);
+ *     if (!base)
+ *             return -EADDRNOTAVAIL;
+ */
+void __iomem *devm_request_and_ioremap(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) {
+               dev_err(dev, "invalid resource\n");
+               return NULL;
+       }
+
+       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 NULL;
+       }
+
+       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);
+       }
+
+       return dest_ptr;
+}
+EXPORT_SYMBOL(devm_request_and_ioremap);
+
 #ifdef CONFIG_HAS_IOPORT
 /*
  * Generic iomap devres
@@ -348,5 +399,5 @@ void pcim_iounmap_regions(struct pci_dev *pdev, u16 mask)
        }
 }
 EXPORT_SYMBOL(pcim_iounmap_regions);
-#endif
-#endif
+#endif /* CONFIG_PCI */
+#endif /* CONFIG_HAS_IOPORT */