diff options
Diffstat (limited to 'lib/devres.c')
| -rw-r--r-- | lib/devres.c | 58 |
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 |