Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758576AbcCDPWO (ORCPT ); Fri, 4 Mar 2016 10:22:14 -0500 Received: from g4t3427.houston.hp.com ([15.201.208.55]:39849 "EHLO g4t3427.houston.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755146AbcCDPWK (ORCPT ); Fri, 4 Mar 2016 10:22:10 -0500 From: Toshi Kani To: mingo@kernel.org, bp@suse.de, dan.j.williams@intel.com, rjw@rjwysocki.net, akpm@linux-foundation.org Cc: linux-nvdimm@ml01.01.org, linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, Toshi Kani Subject: [PATCH v2-UPDATE 3/4] resource: Add device-managed insert/remove_resource() Date: Fri, 4 Mar 2016 09:14:42 -0700 Message-Id: <1457108082-4610-1-git-send-email-toshi.kani@hpe.com> X-Mailer: git-send-email 2.5.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3834 Lines: 116 insert_resource() and remove_resouce() are called by producers of resources, such as FW modules and bus drivers. These modules may be implemented as loadable modules. Add device-managed implementaions of insert_resource() and remove_resouce() functions. Signed-off-by: Toshi Kani Cc: Ingo Molnar Cc: Borislav Petkov Cc: Andrew Morton Cc: Dan Williams --- v2-UPDATE: - Rename a helper remove func to __devm_remove_resource(). (Dan Williams) --- include/linux/ioport.h | 5 +++ kernel/resource.c | 69 ++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 74 insertions(+) diff --git a/include/linux/ioport.h b/include/linux/ioport.h index 8017b8b..3580038 100644 --- a/include/linux/ioport.h +++ b/include/linux/ioport.h @@ -259,6 +259,11 @@ extern struct resource * __devm_request_region(struct device *dev, extern void __devm_release_region(struct device *dev, struct resource *parent, resource_size_t start, resource_size_t n); + +extern int devm_insert_resource(struct device *dev, struct resource *root, + struct resource *new); +extern void devm_remove_resource(struct device *dev, struct resource *old); + extern int iomem_map_sanity_check(resource_size_t addr, unsigned long size); extern int iomem_is_exclusive(u64 addr); diff --git a/kernel/resource.c b/kernel/resource.c index effb6ee..12a9d57 100644 --- a/kernel/resource.c +++ b/kernel/resource.c @@ -1449,6 +1449,75 @@ void __devm_release_region(struct device *dev, struct resource *parent, EXPORT_SYMBOL(__devm_release_region); /* + * Helper remove function for devm_insert_resource() and devm_remove_resource() + */ +static void __devm_remove_resource(struct device *dev, void *ptr) +{ + struct resource **r = ptr; + + remove_resource(*r); +} + +/** + * devm_insert_resource() - insert an I/O or memory resource + * @dev: device for which to produce the resource + * @root: root of the resource tree + * @new: descriptor of the new resource + * + * This is a device-managed version of insert_resource(). There is usually + * no need to release resources requested by this function explicitly since + * that will be taken care of when the device is unbound from its bus driver. + * If for some reason the resource needs to be released explicitly, because + * of ordering issues for example, bus drivers must call devm_remove_resource() + * rather than the regular remove_resource(). + * + * devm_insert_resource() is intended for producers of resources, such as + * FW modules and bus drivers. + * + * Returns 0 on success or a negative error code on failure. + */ +int devm_insert_resource(struct device *dev, struct resource *root, + struct resource *new) +{ + struct resource **ptr; + int ret; + + ptr = devres_alloc(__devm_remove_resource, sizeof(*ptr), GFP_KERNEL); + if (!ptr) + return -ENOMEM; + + *ptr = new; + + ret = insert_resource(root, new); + if (ret) { + dev_err(dev, "unable to insert resource: %pR (%d)\n", new, ret); + devres_free(ptr); + return -EBUSY; + } + + devres_add(dev, ptr); + return 0; +} +EXPORT_SYMBOL_GPL(devm_insert_resource); + +/** + * devm_remove_resource() - remove a previously inserted resource + * @dev: device for which to remove the resource + * @old: descriptor of the resource + * + * Remove a resource previously inserted using devm_insert_resource(). + * + * devm_remove_resource() is intended for producers of resources, such as + * FW modules and bus drivers. + */ +void devm_remove_resource(struct device *dev, struct resource *old) +{ + WARN_ON(devres_release(dev, __devm_remove_resource, devm_resource_match, + old)); +} +EXPORT_SYMBOL_GPL(devm_remove_resource); + +/* * Called from init/main.c to reserve IO ports. */ #define MAXRESERVE 4