From 0d9f837c6958a4c14e6bcb5c5edf6c851d65f507 Mon Sep 17 00:00:00 2001 From: Jason Gunthorpe Date: Thu, 17 Jun 2021 16:22:13 +0200 Subject: [PATCH] driver core: Export device_driver_attach() This is intended as a replacement API for device_bind_driver(). It has at least the following benefits: - Internal locking. Few of the users of device_bind_driver() follow the locking rules - Calls device driver probe() internally. Notably this means that devm support for probe works correctly as probe() error will call devres_release_all() - struct device_driver -> dev_groups is supported - Simplified calling convention, no need to manually call probe(). The general usage is for situations that already know what driver to bind and need to ensure the bind is synchronized with other logic. Call device_driver_attach() after device_add(). If probe() returns a failure then this will be preserved up through to the error return of device_driver_attach(). Signed-off-by: Jason Gunthorpe Signed-off-by: Christoph Hellwig Reviewed-by: Cornelia Huck Reviewed-by: Greg Kroah-Hartman Link: https://lore.kernel.org/r/20210617142218.1877096-6-hch@lst.de Signed-off-by: Alex Williamson --- drivers/base/base.h | 1 - drivers/base/dd.c | 3 +++ include/linux/device.h | 2 ++ 3 files changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/base/base.h b/drivers/base/base.h index e5f9b7e6..404db83 100644 --- a/drivers/base/base.h +++ b/drivers/base/base.h @@ -152,7 +152,6 @@ extern int driver_add_groups(struct device_driver *drv, const struct attribute_group **groups); extern void driver_remove_groups(struct device_driver *drv, const struct attribute_group **groups); -int device_driver_attach(struct device_driver *drv, struct device *dev); void device_driver_detach(struct device *dev); extern char *make_class_name(const char *name, struct kobject *kobj); diff --git a/drivers/base/dd.c b/drivers/base/dd.c index 1d80124..daeb9b5 100644 --- a/drivers/base/dd.c +++ b/drivers/base/dd.c @@ -471,6 +471,8 @@ static void driver_sysfs_remove(struct device *dev) * (It is ok to call with no other effort from a driver's probe() method.) * * This function must be called with the device lock held. + * + * Callers should prefer to use device_driver_attach() instead. */ int device_bind_driver(struct device *dev) { @@ -1065,6 +1067,7 @@ int device_driver_attach(struct device_driver *drv, struct device *dev) return -EAGAIN; return ret; } +EXPORT_SYMBOL_GPL(device_driver_attach); static void __driver_attach_async_helper(void *_dev, async_cookie_t cookie) { diff --git a/include/linux/device.h b/include/linux/device.h index f1a0004..d8b9c9e 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -845,6 +845,8 @@ static inline void *dev_get_platdata(const struct device *dev) * Manual binding of a device to driver. See drivers/base/bus.c * for information on use. */ +int __must_check device_driver_attach(struct device_driver *drv, + struct device *dev); int __must_check device_bind_driver(struct device *dev); void device_release_driver(struct device *dev); int __must_check device_attach(struct device *dev); -- 2.7.4