1 files changed, 45 insertions, 13 deletions

diff --git a/lib/devres.c b/lib/devres.c
index 80b9c76d436a..88ad75952a76 100644
--- a/lib/devres.c
+++ b/lib/devres.c
@@ -1,3 +1,4 @@
+#include <linux/err.h>
 #include <linux/pci.h>
 #include <linux/io.h>
 #include <linux/gfp.h>
@@ -86,22 +87,24 @@ 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
+ * devm_ioremap_resource() - 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:
+ * Checks that a resource is a valid memory region, requests the memory region
+ * and ioremaps it either as cacheable or as non-cacheable memory depending on
+ * the resource's flags. All operations are managed and will be undone on
+ * driver detach.
+ *
+ * Returns a pointer to the remapped memory or an ERR_PTR() encoded error code
+ * on failure. Usage example:
  *
  *      res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- *      base = devm_request_and_ioremap(&pdev->dev, res);
- *      if (!base)
- *              return -EADDRNOTAVAIL;
+ *      base = devm_ioremap_resource(&pdev->dev, res);
+ *      if (IS_ERR(base))
+ *              return PTR_ERR(base);
  */
-void __iomem *devm_request_and_ioremap(struct device *dev,
-                        struct resource *res)
+void __iomem *devm_ioremap_resource(struct device *dev, struct resource *res)
 {
         resource_size_t size;
         const char *name;
@@ -111,7 +114,7 @@ void __iomem *devm_request_and_ioremap(struct device *dev,
 
         if (!res || resource_type(res) != IORESOURCE_MEM) {
                 dev_err(dev, "invalid resource\n");
-                return NULL;
+                return ERR_PTR(-EINVAL);
         }
 
         size = resource_size(res);
@@ -119,7 +122,7 @@ void __iomem *devm_request_and_ioremap(struct device *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;
+                return ERR_PTR(-EBUSY);
         }
 
         if (res->flags & IORESOURCE_CACHEABLE)
@@ -130,10 +133,39 @@ void __iomem *devm_request_and_ioremap(struct device *dev,
         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;
 }
+EXPORT_SYMBOL(devm_ioremap_resource);
+
+/**
+ * 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 *device,
+                                       struct resource *res)
+{
+        void __iomem *dest_ptr;
+
+        dest_ptr = devm_ioremap_resource(device, res);
+        if (IS_ERR(dest_ptr))
+                return NULL;
+
+        return dest_ptr;
+}
 EXPORT_SYMBOL(devm_request_and_ioremap);
 
 #ifdef CONFIG_HAS_IOPORT