Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755478Ab3GKAgc (ORCPT ); Wed, 10 Jul 2013 20:36:32 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:56631 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755270Ab3GKAg3 (ORCPT ); Wed, 10 Jul 2013 20:36:29 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: oliver+list@schinagl.nl, linux@roeck-us.net, khali@linux-fr.org, Greg Kroah-Hartman Subject: [PATCH v2 6/7] driver core: Introduce device_create_groups Date: Wed, 10 Jul 2013 17:36:04 -0700 Message-Id: <1373502965-1683-7-git-send-email-gregkh@linuxfoundation.org> X-Mailer: git-send-email 1.8.3.rc0.20.gb99dd2e In-Reply-To: <1373502965-1683-1-git-send-email-gregkh@linuxfoundation.org> References: <1373486714-14531-1-git-send-email-gregkh@linuxfoundation.org> <1373502965-1683-1-git-send-email-gregkh@linuxfoundation.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 7150 Lines: 184 From: Guenter Roeck device_create_groups lets callers create devices as well as associated sysfs attributes with a single call. This avoids race conditions seen if sysfs attributes on new devices are created later. [fixed up comment block placement and add checks for printk buffer formats - gregkh] Signed-off-by: Guenter Roeck Cc: Jean Delvare Signed-off-by: Greg Kroah-Hartman --- drivers/base/core.c | 111 ++++++++++++++++++++++++++++++++++++------------- include/linux/device.h | 5 +++ 2 files changed, 88 insertions(+), 28 deletions(-) diff --git a/drivers/base/core.c b/drivers/base/core.c index dc3ea23..a8aae18 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -1667,34 +1667,11 @@ static void device_create_release(struct device *dev) kfree(dev); } -/** - * device_create_vargs - creates a device and registers it with sysfs - * @class: pointer to the struct class that this device should be registered to - * @parent: pointer to the parent struct device of this new device, if any - * @devt: the dev_t for the char device to be added - * @drvdata: the data to be added to the device for callbacks - * @fmt: string for the device's name - * @args: va_list for the device's name - * - * This function can be used by char device classes. A struct device - * will be created in sysfs, registered to the specified class. - * - * A "dev" file will be created, showing the dev_t for the device, if - * the dev_t is not 0,0. - * If a pointer to a parent struct device is passed in, the newly created - * struct device will be a child of that device in sysfs. - * The pointer to the struct device will be returned from the call. - * Any further sysfs files that might be required can be created using this - * pointer. - * - * Returns &struct device pointer on success, or ERR_PTR() on error. - * - * Note: the struct class passed to this function must have previously - * been created with a call to class_create(). - */ -struct device *device_create_vargs(struct class *class, struct device *parent, - dev_t devt, void *drvdata, const char *fmt, - va_list args) +static struct device * +device_create_groups_vargs(struct class *class, struct device *parent, + dev_t devt, void *drvdata, + const struct attribute_group **groups, + const char *fmt, va_list args) { struct device *dev = NULL; int retval = -ENODEV; @@ -1711,6 +1688,7 @@ struct device *device_create_vargs(struct class *class, struct device *parent, dev->devt = devt; dev->class = class; dev->parent = parent; + dev->groups = groups; dev->release = device_create_release; dev_set_drvdata(dev, drvdata); @@ -1728,6 +1706,39 @@ error: put_device(dev); return ERR_PTR(retval); } + +/** + * device_create_vargs - creates a device and registers it with sysfs + * @class: pointer to the struct class that this device should be registered to + * @parent: pointer to the parent struct device of this new device, if any + * @devt: the dev_t for the char device to be added + * @drvdata: the data to be added to the device for callbacks + * @fmt: string for the device's name + * @args: va_list for the device's name + * + * This function can be used by char device classes. A struct device + * will be created in sysfs, registered to the specified class. + * + * A "dev" file will be created, showing the dev_t for the device, if + * the dev_t is not 0,0. + * If a pointer to a parent struct device is passed in, the newly created + * struct device will be a child of that device in sysfs. + * The pointer to the struct device will be returned from the call. + * Any further sysfs files that might be required can be created using this + * pointer. + * + * Returns &struct device pointer on success, or ERR_PTR() on error. + * + * Note: the struct class passed to this function must have previously + * been created with a call to class_create(). + */ +struct device *device_create_vargs(struct class *class, struct device *parent, + dev_t devt, void *drvdata, const char *fmt, + va_list args) +{ + return device_create_groups_vargs(class, parent, devt, drvdata, NULL, + fmt, args); +} EXPORT_SYMBOL_GPL(device_create_vargs); /** @@ -1767,6 +1778,50 @@ struct device *device_create(struct class *class, struct device *parent, } EXPORT_SYMBOL_GPL(device_create); +/** + * device_create_with_groups - creates a device and registers it with sysfs + * @class: pointer to the struct class that this device should be registered to + * @parent: pointer to the parent struct device of this new device, if any + * @devt: the dev_t for the char device to be added + * @drvdata: the data to be added to the device for callbacks + * @groups: NULL-terminated list of attribute groups to be created + * @fmt: string for the device's name + * + * This function can be used by char device classes. A struct device + * will be created in sysfs, registered to the specified class. + * Additional attributes specified in the groups parameter will also + * be created automatically. + * + * A "dev" file will be created, showing the dev_t for the device, if + * the dev_t is not 0,0. + * If a pointer to a parent struct device is passed in, the newly created + * struct device will be a child of that device in sysfs. + * The pointer to the struct device will be returned from the call. + * Any further sysfs files that might be required can be created using this + * pointer. + * + * Returns &struct device pointer on success, or ERR_PTR() on error. + * + * Note: the struct class passed to this function must have previously + * been created with a call to class_create(). + */ +struct device *device_create_with_groups(struct class *class, + struct device *parent, dev_t devt, + void *drvdata, + const struct attribute_group **groups, + const char *fmt, ...) +{ + va_list vargs; + struct device *dev; + + va_start(vargs, fmt); + dev = device_create_groups_vargs(class, parent, devt, drvdata, groups, + fmt, vargs); + va_end(vargs); + return dev; +} +EXPORT_SYMBOL_GPL(device_create_with_groups); + static int __match_devt(struct device *dev, const void *data) { const dev_t *devt = data; diff --git a/include/linux/device.h b/include/linux/device.h index f207a8f..bd5931e 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -938,6 +938,11 @@ extern __printf(5, 6) struct device *device_create(struct class *cls, struct device *parent, dev_t devt, void *drvdata, const char *fmt, ...); +extern __printf(6, 7) +struct device *device_create_with_groups(struct class *cls, + struct device *parent, dev_t devt, void *drvdata, + const struct attribute_group **groups, + const char *fmt, ...); extern void device_destroy(struct class *cls, dev_t devt); /* -- 1.8.3.rc0.20.gb99dd2e -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/