driver core: remove fields from struct bus_type
struct bus_type is static everywhere in the kernel. This moves the kobject in the structure out of it, and a bunch of other private only to the driver core fields are now moved to a private structure. This lets us dynamically create the backing kobject properly and gives us the chance to be able to document to users exactly how to use the struct bus_type as there are no fields they can improperly access. Thanks to Kay for the build fixes on this patch. Cc: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Greg Kroah-Hartman
parent
b249072ee6
commit
c6f7e72a3f
@ -1,6 +1,34 @@
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/**
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* struct bus_type_private - structure to hold the private to the driver core portions of the bus_type structure.
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*
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* @subsys - the struct kset that defines this bus. This is the main kobject
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* @drivers_kset - the list of drivers associated with this bus
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* @devices_kset - the list of devices associated with this bus
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* @klist_devices - the klist to iterate over the @devices_kset
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* @klist_drivers - the klist to iterate over the @drivers_kset
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* @bus_notifier - the bus notifier list for anything that cares about things
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* on this bus.
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* @bus - pointer back to the struct bus_type that this structure is associated
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* with.
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*
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* This structure is the one that is the actual kobject allowing struct
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* bus_type to be statically allocated safely. Nothing outside of the driver
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* core should ever touch these fields.
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*/
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struct bus_type_private {
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struct kset subsys;
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struct kset *drivers_kset;
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struct kset *devices_kset;
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struct klist klist_devices;
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struct klist klist_drivers;
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struct blocking_notifier_head bus_notifier;
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unsigned int drivers_autoprobe:1;
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struct bus_type *bus;
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};
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/* initialisation functions */
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extern int devices_init(void);
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extern int buses_init(void);
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extern int classes_init(void);
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@ -17,7 +17,7 @@
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#include "power/power.h"
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#define to_bus_attr(_attr) container_of(_attr, struct bus_attribute, attr)
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#define to_bus(obj) container_of(obj, struct bus_type, subsys.kobj)
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#define to_bus(obj) container_of(obj, struct bus_type_private, subsys.kobj)
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/*
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* sysfs bindings for drivers
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@ -32,13 +32,17 @@ static int __must_check bus_rescan_devices_helper(struct device *dev,
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static struct bus_type *bus_get(struct bus_type *bus)
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{
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return bus ? container_of(kset_get(&bus->subsys),
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struct bus_type, subsys) : NULL;
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if (bus) {
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kset_get(&bus->p->subsys);
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return bus;
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}
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return NULL;
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}
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static void bus_put(struct bus_type *bus)
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{
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kset_put(&bus->subsys);
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if (bus)
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kset_put(&bus->p->subsys);
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}
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static ssize_t
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@ -104,11 +108,11 @@ static ssize_t
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bus_attr_show(struct kobject * kobj, struct attribute * attr, char * buf)
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{
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struct bus_attribute * bus_attr = to_bus_attr(attr);
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struct bus_type * bus = to_bus(kobj);
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struct bus_type_private *bus_priv = to_bus(kobj);
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ssize_t ret = 0;
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if (bus_attr->show)
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ret = bus_attr->show(bus, buf);
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ret = bus_attr->show(bus_priv->bus, buf);
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return ret;
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}
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@ -117,11 +121,11 @@ bus_attr_store(struct kobject * kobj, struct attribute * attr,
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const char * buf, size_t count)
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{
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struct bus_attribute * bus_attr = to_bus_attr(attr);
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struct bus_type * bus = to_bus(kobj);
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struct bus_type_private *bus_priv = to_bus(kobj);
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ssize_t ret = 0;
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if (bus_attr->store)
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ret = bus_attr->store(bus, buf, count);
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ret = bus_attr->store(bus_priv->bus, buf, count);
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return ret;
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}
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@ -134,7 +138,7 @@ int bus_create_file(struct bus_type * bus, struct bus_attribute * attr)
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{
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int error;
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if (bus_get(bus)) {
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error = sysfs_create_file(&bus->subsys.kobj, &attr->attr);
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error = sysfs_create_file(&bus->p->subsys.kobj, &attr->attr);
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bus_put(bus);
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} else
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error = -EINVAL;
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@ -144,7 +148,7 @@ int bus_create_file(struct bus_type * bus, struct bus_attribute * attr)
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void bus_remove_file(struct bus_type * bus, struct bus_attribute * attr)
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{
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if (bus_get(bus)) {
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sysfs_remove_file(&bus->subsys.kobj, &attr->attr);
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sysfs_remove_file(&bus->p->subsys.kobj, &attr->attr);
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bus_put(bus);
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}
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}
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@ -237,16 +241,16 @@ static DRIVER_ATTR(bind, S_IWUSR, NULL, driver_bind);
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static ssize_t show_drivers_autoprobe(struct bus_type *bus, char *buf)
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{
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return sprintf(buf, "%d\n", bus->drivers_autoprobe);
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return sprintf(buf, "%d\n", bus->p->drivers_autoprobe);
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}
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static ssize_t store_drivers_autoprobe(struct bus_type *bus,
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const char *buf, size_t count)
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{
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if (buf[0] == '0')
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bus->drivers_autoprobe = 0;
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bus->p->drivers_autoprobe = 0;
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else
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bus->drivers_autoprobe = 1;
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bus->p->drivers_autoprobe = 1;
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return count;
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}
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@ -300,7 +304,7 @@ int bus_for_each_dev(struct bus_type * bus, struct device * start,
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if (!bus)
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return -EINVAL;
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klist_iter_init_node(&bus->klist_devices, &i,
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klist_iter_init_node(&bus->p->klist_devices, &i,
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(start ? &start->knode_bus : NULL));
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while ((dev = next_device(&i)) && !error)
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error = fn(dev, data);
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@ -333,7 +337,7 @@ struct device * bus_find_device(struct bus_type *bus,
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if (!bus)
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return NULL;
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klist_iter_init_node(&bus->klist_devices, &i,
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klist_iter_init_node(&bus->p->klist_devices, &i,
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(start ? &start->knode_bus : NULL));
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while ((dev = next_device(&i)))
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if (match(dev, data) && get_device(dev))
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@ -379,7 +383,7 @@ int bus_for_each_drv(struct bus_type * bus, struct device_driver * start,
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if (!bus)
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return -EINVAL;
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klist_iter_init_node(&bus->klist_drivers, &i,
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klist_iter_init_node(&bus->p->klist_drivers, &i,
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start ? &start->knode_bus : NULL);
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while ((drv = next_driver(&i)) && !error)
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error = fn(drv, data);
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@ -420,7 +424,7 @@ static void device_remove_attrs(struct bus_type * bus, struct device * dev)
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static int make_deprecated_bus_links(struct device *dev)
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{
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return sysfs_create_link(&dev->kobj,
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&dev->bus->subsys.kobj, "bus");
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&dev->bus->p->subsys.kobj, "bus");
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}
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static void remove_deprecated_bus_links(struct device *dev)
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@ -449,12 +453,12 @@ int bus_add_device(struct device * dev)
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error = device_add_attrs(bus, dev);
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if (error)
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goto out_put;
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error = sysfs_create_link(&bus->devices_kset->kobj,
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error = sysfs_create_link(&bus->p->devices_kset->kobj,
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&dev->kobj, dev->bus_id);
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if (error)
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goto out_id;
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error = sysfs_create_link(&dev->kobj,
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&dev->bus->subsys.kobj, "subsystem");
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&dev->bus->p->subsys.kobj, "subsystem");
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if (error)
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goto out_subsys;
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error = make_deprecated_bus_links(dev);
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@ -466,7 +470,7 @@ int bus_add_device(struct device * dev)
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out_deprecated:
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sysfs_remove_link(&dev->kobj, "subsystem");
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out_subsys:
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sysfs_remove_link(&bus->devices_kset->kobj, dev->bus_id);
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sysfs_remove_link(&bus->p->devices_kset->kobj, dev->bus_id);
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out_id:
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device_remove_attrs(bus, dev);
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out_put:
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@ -488,11 +492,11 @@ void bus_attach_device(struct device * dev)
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if (bus) {
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dev->is_registered = 1;
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if (bus->drivers_autoprobe)
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if (bus->p->drivers_autoprobe)
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ret = device_attach(dev);
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WARN_ON(ret < 0);
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if (ret >= 0)
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klist_add_tail(&dev->knode_bus, &bus->klist_devices);
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klist_add_tail(&dev->knode_bus, &bus->p->klist_devices);
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else
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dev->is_registered = 0;
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}
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@ -512,7 +516,7 @@ void bus_remove_device(struct device * dev)
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if (dev->bus) {
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sysfs_remove_link(&dev->kobj, "subsystem");
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remove_deprecated_bus_links(dev);
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sysfs_remove_link(&dev->bus->devices_kset->kobj, dev->bus_id);
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sysfs_remove_link(&dev->bus->p->devices_kset->kobj, dev->bus_id);
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device_remove_attrs(dev->bus, dev);
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if (dev->is_registered) {
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dev->is_registered = 0;
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@ -638,18 +642,18 @@ int bus_add_driver(struct device_driver *drv)
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error = kobject_set_name(&drv->kobj, "%s", drv->name);
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if (error)
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goto out_put_bus;
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drv->kobj.kset = bus->drivers_kset;
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drv->kobj.kset = bus->p->drivers_kset;
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drv->kobj.ktype = &driver_ktype;
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error = kobject_register(&drv->kobj);
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if (error)
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goto out_put_bus;
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if (drv->bus->drivers_autoprobe) {
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if (drv->bus->p->drivers_autoprobe) {
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error = driver_attach(drv);
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if (error)
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goto out_unregister;
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}
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klist_add_tail(&drv->knode_bus, &bus->klist_drivers);
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klist_add_tail(&drv->knode_bus, &bus->p->klist_drivers);
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module_add_driver(drv->owner, drv);
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error = driver_create_file(drv, &driver_attr_uevent);
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@ -828,7 +832,7 @@ static ssize_t bus_uevent_store(struct bus_type *bus,
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enum kobject_action action;
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if (kobject_action_type(buf, count, &action) == 0)
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kobject_uevent(&bus->subsys.kobj, action);
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kobject_uevent(&bus->p->subsys.kobj, action);
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return count;
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}
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static BUS_ATTR(uevent, S_IWUSR, NULL, bus_uevent_store);
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@ -844,17 +848,26 @@ static BUS_ATTR(uevent, S_IWUSR, NULL, bus_uevent_store);
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int bus_register(struct bus_type * bus)
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{
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int retval;
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struct bus_type_private *priv;
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BLOCKING_INIT_NOTIFIER_HEAD(&bus->bus_notifier);
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priv = kzalloc(sizeof(struct bus_type_private), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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retval = kobject_set_name(&bus->subsys.kobj, "%s", bus->name);
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priv->bus = bus;
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bus->p = priv;
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BLOCKING_INIT_NOTIFIER_HEAD(&priv->bus_notifier);
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retval = kobject_set_name(&priv->subsys.kobj, "%s", bus->name);
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if (retval)
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goto out;
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bus->subsys.kobj.kset = bus_kset;
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bus->subsys.kobj.ktype = &bus_ktype;
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priv->subsys.kobj.kset = bus_kset;
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priv->subsys.kobj.ktype = &bus_ktype;
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priv->drivers_autoprobe = 1;
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retval = kset_register(&bus->subsys);
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retval = kset_register(&priv->subsys);
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if (retval)
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goto out;
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@ -862,24 +875,23 @@ int bus_register(struct bus_type * bus)
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if (retval)
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goto bus_uevent_fail;
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bus->devices_kset = kset_create_and_add("devices", NULL,
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&bus->subsys.kobj);
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if (!bus->devices_kset) {
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priv->devices_kset = kset_create_and_add("devices", NULL,
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&priv->subsys.kobj);
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if (!priv->devices_kset) {
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retval = -ENOMEM;
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goto bus_devices_fail;
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}
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bus->drivers_kset = kset_create_and_add("drivers", NULL,
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&bus->subsys.kobj);
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if (!bus->drivers_kset) {
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priv->drivers_kset = kset_create_and_add("drivers", NULL,
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&priv->subsys.kobj);
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if (!priv->drivers_kset) {
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retval = -ENOMEM;
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goto bus_drivers_fail;
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}
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klist_init(&bus->klist_devices, klist_devices_get, klist_devices_put);
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klist_init(&bus->klist_drivers, NULL, NULL);
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klist_init(&priv->klist_devices, klist_devices_get, klist_devices_put);
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klist_init(&priv->klist_drivers, NULL, NULL);
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bus->drivers_autoprobe = 1;
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retval = add_probe_files(bus);
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if (retval)
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goto bus_probe_files_fail;
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@ -894,13 +906,14 @@ int bus_register(struct bus_type * bus)
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bus_attrs_fail:
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remove_probe_files(bus);
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bus_probe_files_fail:
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kset_unregister(bus->drivers_kset);
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kset_unregister(bus->p->drivers_kset);
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bus_drivers_fail:
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kset_unregister(bus->devices_kset);
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kset_unregister(bus->p->devices_kset);
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bus_devices_fail:
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bus_remove_file(bus, &bus_attr_uevent);
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bus_uevent_fail:
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kset_unregister(&bus->subsys);
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kset_unregister(&bus->p->subsys);
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kfree(bus->p);
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out:
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return retval;
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}
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@ -917,33 +930,34 @@ void bus_unregister(struct bus_type * bus)
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pr_debug("bus %s: unregistering\n", bus->name);
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bus_remove_attrs(bus);
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remove_probe_files(bus);
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kset_unregister(bus->drivers_kset);
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kset_unregister(bus->devices_kset);
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kset_unregister(bus->p->drivers_kset);
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kset_unregister(bus->p->devices_kset);
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bus_remove_file(bus, &bus_attr_uevent);
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kset_unregister(&bus->subsys);
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kset_unregister(&bus->p->subsys);
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kfree(bus->p);
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}
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int bus_register_notifier(struct bus_type *bus, struct notifier_block *nb)
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{
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return blocking_notifier_chain_register(&bus->bus_notifier, nb);
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return blocking_notifier_chain_register(&bus->p->bus_notifier, nb);
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}
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EXPORT_SYMBOL_GPL(bus_register_notifier);
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int bus_unregister_notifier(struct bus_type *bus, struct notifier_block *nb)
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{
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return blocking_notifier_chain_unregister(&bus->bus_notifier, nb);
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return blocking_notifier_chain_unregister(&bus->p->bus_notifier, nb);
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}
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EXPORT_SYMBOL_GPL(bus_unregister_notifier);
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struct kset *bus_get_kset(struct bus_type *bus)
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{
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return &bus->subsys;
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return &bus->p->subsys;
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}
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EXPORT_SYMBOL_GPL(bus_get_kset);
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struct klist *bus_get_device_klist(struct bus_type *bus)
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{
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return &bus->klist_devices;
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return &bus->p->klist_devices;
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}
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EXPORT_SYMBOL_GPL(bus_get_device_klist);
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@ -769,7 +769,7 @@ int device_add(struct device *dev)
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/* notify clients of device entry (new way) */
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if (dev->bus)
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blocking_notifier_call_chain(&dev->bus->bus_notifier,
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blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
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BUS_NOTIFY_ADD_DEVICE, dev);
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error = device_create_file(dev, &uevent_attr);
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@ -820,7 +820,7 @@ int device_add(struct device *dev)
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dpm_sysfs_remove(dev);
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PMError:
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if (dev->bus)
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blocking_notifier_call_chain(&dev->bus->bus_notifier,
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blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
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BUS_NOTIFY_DEL_DEVICE, dev);
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device_remove_attrs(dev);
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AttrsError:
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@ -999,7 +999,7 @@ void device_del(struct device * dev)
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if (platform_notify_remove)
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platform_notify_remove(dev);
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if (dev->bus)
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blocking_notifier_call_chain(&dev->bus->bus_notifier,
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blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
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BUS_NOTIFY_DEL_DEVICE, dev);
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kobject_uevent(&dev->kobj, KOBJ_REMOVE);
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kobject_del(&dev->kobj);
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@ -38,7 +38,7 @@ static void driver_bound(struct device *dev)
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dev->bus_id, dev->driver->name);
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if (dev->bus)
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blocking_notifier_call_chain(&dev->bus->bus_notifier,
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blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
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BUS_NOTIFY_BOUND_DRIVER, dev);
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klist_add_tail(&dev->knode_driver, &dev->driver->klist_devices);
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@ -296,7 +296,7 @@ static void __device_release_driver(struct device * dev)
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klist_remove(&dev->knode_driver);
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if (dev->bus)
|
||||
blocking_notifier_call_chain(&dev->bus->bus_notifier,
|
||||
blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
|
||||
BUS_NOTIFY_UNBIND_DRIVER,
|
||||
dev);
|
||||
|
||||
|
||||
@ -185,7 +185,7 @@ void driver_unregister(struct device_driver * drv)
|
||||
*/
|
||||
struct device_driver *driver_find(const char *name, struct bus_type *bus)
|
||||
{
|
||||
struct kobject *k = kset_find_obj(bus->drivers_kset, name);
|
||||
struct kobject *k = kset_find_obj(bus->p->drivers_kset, name);
|
||||
if (k)
|
||||
return to_drv(k);
|
||||
return NULL;
|
||||
|
||||
@ -497,12 +497,12 @@ int __init_or_module platform_driver_probe(struct platform_driver *drv,
|
||||
* if the probe was successful, and make sure any forced probes of
|
||||
* new devices fail.
|
||||
*/
|
||||
spin_lock(&platform_bus_type.klist_drivers.k_lock);
|
||||
spin_lock(&platform_bus_type.p->klist_drivers.k_lock);
|
||||
drv->probe = NULL;
|
||||
if (code == 0 && list_empty(&drv->driver.klist_devices.k_list))
|
||||
retval = -ENODEV;
|
||||
drv->driver.probe = platform_drv_probe_fail;
|
||||
spin_unlock(&platform_bus_type.klist_drivers.k_lock);
|
||||
spin_unlock(&platform_bus_type.p->klist_drivers.k_lock);
|
||||
|
||||
if (code != retval)
|
||||
platform_driver_unregister(drv);
|
||||
|
||||
@ -35,6 +35,7 @@ struct device_driver;
|
||||
struct class;
|
||||
struct class_device;
|
||||
struct bus_type;
|
||||
struct bus_type_private;
|
||||
|
||||
struct bus_attribute {
|
||||
struct attribute attr;
|
||||
@ -51,15 +52,6 @@ extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
|
||||
|
||||
struct bus_type {
|
||||
const char * name;
|
||||
|
||||
struct kset subsys;
|
||||
struct kset *drivers_kset;
|
||||
struct kset *devices_kset;
|
||||
struct klist klist_devices;
|
||||
struct klist klist_drivers;
|
||||
|
||||
struct blocking_notifier_head bus_notifier;
|
||||
|
||||
struct bus_attribute * bus_attrs;
|
||||
struct device_attribute * dev_attrs;
|
||||
struct driver_attribute * drv_attrs;
|
||||
@ -75,7 +67,7 @@ struct bus_type {
|
||||
int (*resume_early)(struct device * dev);
|
||||
int (*resume)(struct device * dev);
|
||||
|
||||
unsigned int drivers_autoprobe:1;
|
||||
struct bus_type_private *p;
|
||||
};
|
||||
|
||||
extern int __must_check bus_register(struct bus_type * bus);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user