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Driver core: make old versions of udev work properly 

If CONFIG_SYSFS_DEPRECATED is enabled, old versions of udev will work
properly with devices that are associated with a class.

Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
hifive-unleashed-5.1
Greg Kroah-Hartman 2006-10-24 00:37:58 +01:00
parent 88a22c985e
commit 40fa54226f
1 changed files with 45 additions and 14 deletions
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59
drivers/base/core.c
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@ -384,6 +384,19 @@ void device_initialize(struct device *dev)
device_init_wakeup(dev, 0);
}
#ifdef CONFIG_SYSFS_DEPRECATED
int setup_parent(struct device *dev, struct device *parent)
{
/* Set the parent to the class, not the parent device */
/* this keeps sysfs from having a symlink to make old udevs happy */
if (dev->class)
dev->kobj.parent = &dev->class->subsys.kset.kobj;
else if (parent)
dev->kobj.parent = &parent->kobj;
return 0;
}
#else
static int virtual_device_parent(struct device *dev)
{
if (!dev->class)
@ -401,6 +414,22 @@ static int virtual_device_parent(struct device *dev)
return 0;
}
int setup_parent(struct device *dev, struct device *parent)
{
int error;
/* if this is a class device, and has no parent, create one */
if ((dev->class) && (parent == NULL)) {
error = virtual_device_parent(dev);
if (error)
return error;
} else if (parent)
dev->kobj.parent = &parent->kobj;
return 0;
}
#endif
/**
* device_add - add device to device hierarchy.
* @dev: device.
@ -423,23 +452,18 @@ int device_add(struct device *dev)
if (!dev || !strlen(dev->bus_id))
goto Error;
/* if this is a class device, and has no parent, create one */
if ((dev->class) && (dev->parent == NULL)) {
error = virtual_device_parent(dev);
if (error)
goto Error;
}
pr_debug("DEV: registering device: ID = '%s'\n", dev->bus_id);
parent = get_device(dev->parent);
pr_debug("DEV: registering device: ID = '%s'\n", dev->bus_id);
error = setup_parent(dev, parent);
if (error)
goto Error;
/* first, register with generic layer. */
kobject_set_name(&dev->kobj, "%s", dev->bus_id);
if (parent)
dev->kobj.parent = &parent->kobj;
if ((error = kobject_add(&dev->kobj)))
error = kobject_add(&dev->kobj);
if (error)
goto Error;
/* notify platform of device entry */
@ -484,8 +508,11 @@ int device_add(struct device *dev)
if (dev->class) {
sysfs_create_link(&dev->kobj, &dev->class->subsys.kset.kobj,
"subsystem");
sysfs_create_link(&dev->class->subsys.kset.kobj, &dev->kobj,
dev->bus_id);
/* If this is not a "fake" compatible device, then create the
* symlink from the class to the device. */
if (dev->kobj.parent != &dev->class->subsys.kset.kobj)
sysfs_create_link(&dev->class->subsys.kset.kobj,
&dev->kobj, dev->bus_id);
if (parent) {
sysfs_create_link(&dev->kobj, &dev->parent->kobj, "device");
class_name = make_class_name(dev->class->name, &dev->kobj);
@ -623,7 +650,11 @@ void device_del(struct device * dev)
}
if (dev->class) {
sysfs_remove_link(&dev->kobj, "subsystem");
sysfs_remove_link(&dev->class->subsys.kset.kobj, dev->bus_id);
/* If this is not a "fake" compatible device, remove the
* symlink from the class to the device. */
if (dev->kobj.parent != &dev->class->subsys.kset.kobj)
sysfs_remove_link(&dev->class->subsys.kset.kobj,
dev->bus_id);
class_name = make_class_name(dev->class->name, &dev->kobj);
if (parent) {
sysfs_remove_link(&dev->kobj, "device");