From 0a1229455856f0ebc4de5d0985a049d002ab8dcf Mon Sep 17 00:00:00 2001 From: Jingoo Han Date: Wed, 27 Mar 2013 10:25:13 +1100 Subject: [PATCH] rtc: add devm_rtc_device_{register,unregister}() These functions allow the driver core to automatically clean up any allocation made by rtc drivers. Thus it simplifies the error paths. Signed-off-by: Jingoo Han Acked-by: Tejun Heo Signed-off-by: Andrew Morton --- drivers/rtc/class.c | 70 +++++++++++++++++++++++++++++++++++++++++++++ include/linux/rtc.h | 6 ++++ 2 files changed, 76 insertions(+) diff --git a/drivers/rtc/class.c b/drivers/rtc/class.c index 9b742d3ffb94..b72b40bd7805 100644 --- a/drivers/rtc/class.c +++ b/drivers/rtc/class.c @@ -259,6 +259,76 @@ void rtc_device_unregister(struct rtc_device *rtc) } EXPORT_SYMBOL_GPL(rtc_device_unregister); +static void devm_rtc_device_release(struct device *dev, void *res) +{ + struct rtc_device *rtc = *(struct rtc_device **)res; + + rtc_device_unregister(rtc); +} + +static int devm_rtc_device_match(struct device *dev, void *res, void *data) +{ + struct rtc **r = res; + + return *r == data; +} + +/** + * devm_rtc_device_register - resource managed rtc_device_register() + * @name: the name of the device + * @dev: the device to register + * @ops: the rtc operations structure + * @owner: the module owner + * + * @return a struct rtc on success, or an ERR_PTR on error + * + * Managed rtc_device_register(). The rtc_device returned from this function + * are automatically freed on driver detach. See rtc_device_register() + * for more information. + */ + +struct rtc_device *devm_rtc_device_register(const char *name, + struct device *dev, + const struct rtc_class_ops *ops, + struct module *owner) +{ + struct rtc_device **ptr, *rtc; + + ptr = devres_alloc(devm_rtc_device_release, sizeof(*ptr), GFP_KERNEL); + if (!ptr) + return ERR_PTR(-ENOMEM); + + rtc = rtc_device_register(name, dev, ops, owner); + if (!IS_ERR(rtc)) { + *ptr = rtc; + devres_add(dev, ptr); + } else { + devres_free(ptr); + } + + return rtc; +} +EXPORT_SYMBOL_GPL(devm_rtc_device_register); + +/** + * devm_rtc_device_unregister - resource managed devm_rtc_device_unregister() + * @dev: the device to unregister + * @rtc: the RTC class device to unregister + * + * Deallocated a rtc allocated with devm_rtc_device_register(). Normally this + * function will not need to be called and the resource management code will + * ensure that the resource is freed. + */ +void devm_rtc_device_unregister(struct device *dev, struct rtc_device *rtc) +{ + int rc; + + rc = devres_release(dev, devm_rtc_device_release, + devm_rtc_device_match, rtc); + WARN_ON(rc); +} +EXPORT_SYMBOL_GPL(devm_rtc_device_unregister); + static int __init rtc_init(void) { rtc_class = class_create(THIS_MODULE, "rtc"); diff --git a/include/linux/rtc.h b/include/linux/rtc.h index 580b24c8b8ca..d9557689bb8d 100644 --- a/include/linux/rtc.h +++ b/include/linux/rtc.h @@ -133,7 +133,13 @@ extern struct rtc_device *rtc_device_register(const char *name, struct device *dev, const struct rtc_class_ops *ops, struct module *owner); +extern struct rtc_device *devm_rtc_device_register(const char *name, + struct device *dev, + const struct rtc_class_ops *ops, + struct module *owner); extern void rtc_device_unregister(struct rtc_device *rtc); +extern void devm_rtc_device_unregister(struct device *dev, + struct rtc_device *rtc); extern int rtc_read_time(struct rtc_device *rtc, struct rtc_time *tm); extern int rtc_set_time(struct rtc_device *rtc, struct rtc_time *tm); -- 2.39.5