diff options
| author |   Jason Gunthorpe <jgg@nvidia.com> | 2021-06-17 16:22:13 +0200 |
|---|---|---|
| committer |   Alex Williamson <alex.williamson@redhat.com> | 2021-06-21 15:29:24 -0600 |
| commit | 0d9f837c6958a4c14e6bcb5c5edf6c851d65f507 (patch) | |
| tree | 30c5b1dc14390440c27b42cc2309ad0258074e87 /drivers/base | |
| parent | driver core: Don't return EPROBE_DEFER to userspace during sysfs bind (diff) | |
| download | linux-dev-0d9f837c6958a4c14e6bcb5c5edf6c851d65f507.tar.xz linux-dev-0d9f837c6958a4c14e6bcb5c5edf6c851d65f507.zip | |
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 <jgg@nvidia.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20210617142218.1877096-6-hch@lst.de
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/base.h | 1 | ||||
| -rw-r--r-- | drivers/base/dd.c | 3 |
2 files changed, 3 insertions, 1 deletions
diff --git a/drivers/base/base.h b/drivers/base/base.h index e5f9b7e656c3..404db83ee5ec 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 1d8012459587..daeb9b5763ae 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) { |