From c63469a3985a9771c18a916b8d42845d044ea0b1 Mon Sep 17 00:00:00 2001 From: Greg Kroah-Hartman Date: Wed, 28 Nov 2007 12:23:18 -0800 Subject: Driver core: move the driver specific module code into the driver core The module driver specific code should belong in the driver core, not in the kernel/ directory. So move this code. This is done in preparation for some struct device_driver rework that should be confined to the driver core code only. This also lets us keep from exporting these functions, as no external code should ever be calling it. Thanks to Andrew Morton for the !CONFIG_MODULES fix. Signed-off-by: Greg Kroah-Hartman --- drivers/base/module.c | 94 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 94 insertions(+) create mode 100644 drivers/base/module.c (limited to 'drivers/base/module.c') diff --git a/drivers/base/module.c b/drivers/base/module.c new file mode 100644 index 000000000000..cad07be5de1a --- /dev/null +++ b/drivers/base/module.c @@ -0,0 +1,94 @@ +/* + * module.c - module sysfs fun for drivers + * + * This file is released under the GPLv2 + * + */ +#include +#include +#include +#include +#include "base.h" + +static char *make_driver_name(struct device_driver *drv) +{ + char *driver_name; + + driver_name = kmalloc(strlen(drv->name) + strlen(drv->bus->name) + 2, + GFP_KERNEL); + if (!driver_name) + return NULL; + + sprintf(driver_name, "%s:%s", drv->bus->name, drv->name); + return driver_name; +} + +static void module_create_drivers_dir(struct module_kobject *mk) +{ + if (!mk || mk->drivers_dir) + return; + + mk->drivers_dir = kobject_create_and_add("drivers", &mk->kobj); +} + +void module_add_driver(struct module *mod, struct device_driver *drv) +{ + char *driver_name; + int no_warn; + struct module_kobject *mk = NULL; + + if (!drv) + return; + + if (mod) + mk = &mod->mkobj; + else if (drv->mod_name) { + struct kobject *mkobj; + + /* Lookup built-in module entry in /sys/modules */ + mkobj = kset_find_obj(module_kset, drv->mod_name); + if (mkobj) { + mk = container_of(mkobj, struct module_kobject, kobj); + /* remember our module structure */ + drv->mkobj = mk; + /* kset_find_obj took a reference */ + kobject_put(mkobj); + } + } + + if (!mk) + return; + + /* Don't check return codes; these calls are idempotent */ + no_warn = sysfs_create_link(&drv->kobj, &mk->kobj, "module"); + driver_name = make_driver_name(drv); + if (driver_name) { + module_create_drivers_dir(mk); + no_warn = sysfs_create_link(mk->drivers_dir, &drv->kobj, + driver_name); + kfree(driver_name); + } +} + +void module_remove_driver(struct device_driver *drv) +{ + struct module_kobject *mk = NULL; + char *driver_name; + + if (!drv) + return; + + sysfs_remove_link(&drv->kobj, "module"); + + if (drv->owner) + mk = &drv->owner->mkobj; + else if (drv->mkobj) + mk = drv->mkobj; + if (mk && mk->drivers_dir) { + driver_name = make_driver_name(drv); + if (driver_name) { + sysfs_remove_link(mk->drivers_dir, driver_name); + kfree(driver_name); + } + } +} -- cgit v1.2.3 From e5dd12784617f0f1fae5f96a7fac1ec4c49fadbe Mon Sep 17 00:00:00 2001 From: Greg Kroah-Hartman Date: Wed, 28 Nov 2007 15:59:15 -0800 Subject: Driver core: move the static kobject out of struct driver This patch removes the kobject, and a few other driver-core-only fields out of struct driver and into the driver core only. Now drivers can be safely create on the stack or statically (like they currently are.) Cc: Kay Sievers Signed-off-by: Greg Kroah-Hartman --- drivers/base/base.h | 8 ++++++ drivers/base/bus.c | 71 +++++++++++++++++++++++++++---------------------- drivers/base/dd.c | 24 ++++++++--------- drivers/base/driver.c | 40 ++++++++++++++++++---------- drivers/base/module.c | 12 ++++----- drivers/base/platform.c | 2 +- include/linux/device.h | 16 +++++------ 7 files changed, 99 insertions(+), 74 deletions(-) (limited to 'drivers/base/module.c') diff --git a/drivers/base/base.h b/drivers/base/base.h index 05472360f6a2..3b0f395552db 100644 --- a/drivers/base/base.h +++ b/drivers/base/base.h @@ -27,6 +27,14 @@ struct bus_type_private { struct bus_type *bus; }; +struct driver_private { + struct kobject kobj; + struct klist klist_devices; + struct klist_node knode_bus; + struct module_kobject *mkobj; + struct device_driver *driver; +}; +#define to_driver(obj) container_of(obj, struct driver_private, kobj) /* initialisation functions */ extern int devices_init(void); diff --git a/drivers/base/bus.c b/drivers/base/bus.c index 04d3850ff4b7..aa0c986c323a 100644 --- a/drivers/base/bus.c +++ b/drivers/base/bus.c @@ -3,6 +3,8 @@ * * Copyright (c) 2002-3 Patrick Mochel * Copyright (c) 2002-3 Open Source Development Labs + * Copyright (c) 2007 Greg Kroah-Hartman + * Copyright (c) 2007 Novell Inc. * * This file is released under the GPLv2 * @@ -24,7 +26,6 @@ */ #define to_drv_attr(_attr) container_of(_attr, struct driver_attribute, attr) -#define to_driver(obj) container_of(obj, struct device_driver, kobj) static int __must_check bus_rescan_devices_helper(struct device *dev, @@ -49,11 +50,11 @@ static ssize_t drv_attr_show(struct kobject * kobj, struct attribute * attr, char * buf) { struct driver_attribute * drv_attr = to_drv_attr(attr); - struct device_driver * drv = to_driver(kobj); + struct driver_private *drv_priv = to_driver(kobj); ssize_t ret = -EIO; if (drv_attr->show) - ret = drv_attr->show(drv, buf); + ret = drv_attr->show(drv_priv->driver, buf); return ret; } @@ -62,11 +63,11 @@ drv_attr_store(struct kobject * kobj, struct attribute * attr, const char * buf, size_t count) { struct driver_attribute * drv_attr = to_drv_attr(attr); - struct device_driver * drv = to_driver(kobj); + struct driver_private *drv_priv = to_driver(kobj); ssize_t ret = -EIO; if (drv_attr->store) - ret = drv_attr->store(drv, buf, count); + ret = drv_attr->store(drv_priv->driver, buf, count); return ret; } @@ -75,22 +76,12 @@ static struct sysfs_ops driver_sysfs_ops = { .store = drv_attr_store, }; - -static void driver_release(struct kobject * kobj) +static void driver_release(struct kobject *kobj) { - /* - * Yes this is an empty release function, it is this way because struct - * device is always a static object, not a dynamic one. Yes, this is - * not nice and bad, but remember, drivers are code, reference counted - * by the module count, not a device, which is really data. And yes, - * in the future I do want to have all drivers be created dynamically, - * and am working toward that goal, but it will take a bit longer... - * - * But do not let this example give _anyone_ the idea that they can - * create a release function without any code in it at all, to do that - * is almost always wrong. If you have any questions about this, - * please send an email to - */ + struct driver_private *drv_priv = to_driver(kobj); + + pr_debug("%s: freeing %s\n", __FUNCTION__, kobject_name(kobj)); + kfree(drv_priv); } static struct kobj_type driver_ktype = { @@ -350,7 +341,13 @@ struct device * bus_find_device(struct bus_type *bus, static struct device_driver * next_driver(struct klist_iter * i) { struct klist_node * n = klist_next(i); - return n ? container_of(n, struct device_driver, knode_bus) : NULL; + struct driver_private *drv_priv; + + if (n) { + drv_priv = container_of(n, struct driver_private, knode_bus); + return drv_priv->driver; + } + return NULL; } /** @@ -384,7 +381,7 @@ int bus_for_each_drv(struct bus_type * bus, struct device_driver * start, return -EINVAL; klist_iter_init_node(&bus->p->klist_drivers, &i, - start ? &start->knode_bus : NULL); + start ? &start->p->knode_bus : NULL); while ((drv = next_driver(&i)) && !error) error = fn(drv, data); klist_iter_exit(&i); @@ -620,7 +617,7 @@ static ssize_t driver_uevent_store(struct device_driver *drv, enum kobject_action action; if (kobject_action_type(buf, count, &action) == 0) - kobject_uevent(&drv->kobj, action); + kobject_uevent(&drv->p->kobj, action); return count; } static DRIVER_ATTR(uevent, S_IWUSR, NULL, driver_uevent_store); @@ -632,19 +629,29 @@ static DRIVER_ATTR(uevent, S_IWUSR, NULL, driver_uevent_store); */ int bus_add_driver(struct device_driver *drv) { - struct bus_type * bus = bus_get(drv->bus); + struct bus_type *bus; + struct driver_private *priv; int error = 0; + bus = bus_get(drv->bus); if (!bus) return -EINVAL; pr_debug("bus %s: add driver %s\n", bus->name, drv->name); - error = kobject_set_name(&drv->kobj, "%s", drv->name); + + priv = kzalloc(sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + error = kobject_set_name(&priv->kobj, "%s", drv->name); if (error) goto out_put_bus; - drv->kobj.kset = bus->p->drivers_kset; - drv->kobj.ktype = &driver_ktype; - error = kobject_register(&drv->kobj); + priv->kobj.kset = bus->p->drivers_kset; + priv->kobj.ktype = &driver_ktype; + klist_init(&priv->klist_devices, NULL, NULL); + priv->driver = drv; + drv->p = priv; + error = kobject_register(&priv->kobj); if (error) goto out_put_bus; @@ -653,7 +660,7 @@ int bus_add_driver(struct device_driver *drv) if (error) goto out_unregister; } - klist_add_tail(&drv->knode_bus, &bus->p->klist_drivers); + klist_add_tail(&priv->knode_bus, &bus->p->klist_drivers); module_add_driver(drv->owner, drv); error = driver_create_file(drv, &driver_attr_uevent); @@ -676,7 +683,7 @@ int bus_add_driver(struct device_driver *drv) return error; out_unregister: - kobject_unregister(&drv->kobj); + kobject_unregister(&priv->kobj); out_put_bus: bus_put(bus); return error; @@ -699,11 +706,11 @@ void bus_remove_driver(struct device_driver * drv) remove_bind_files(drv); driver_remove_attrs(drv->bus, drv); driver_remove_file(drv, &driver_attr_uevent); - klist_remove(&drv->knode_bus); + klist_remove(&drv->p->knode_bus); pr_debug("bus %s: remove driver %s\n", drv->bus->name, drv->name); driver_detach(drv); module_remove_driver(drv); - kobject_unregister(&drv->kobj); + kobject_unregister(&drv->p->kobj); bus_put(drv->bus); } diff --git a/drivers/base/dd.c b/drivers/base/dd.c index 7bf0e674c975..87a348ce818c 100644 --- a/drivers/base/dd.c +++ b/drivers/base/dd.c @@ -11,6 +11,8 @@ * * Copyright (c) 2002-5 Patrick Mochel * Copyright (c) 2002-3 Open Source Development Labs + * Copyright (c) 2007 Greg Kroah-Hartman + * Copyright (c) 2007 Novell Inc. * * This file is released under the GPLv2 */ @@ -23,8 +25,6 @@ #include "base.h" #include "power/power.h" -#define to_drv(node) container_of(node, struct device_driver, kobj.entry) - static void driver_bound(struct device *dev) { @@ -41,20 +41,20 @@ static void driver_bound(struct device *dev) blocking_notifier_call_chain(&dev->bus->p->bus_notifier, BUS_NOTIFY_BOUND_DRIVER, dev); - klist_add_tail(&dev->knode_driver, &dev->driver->klist_devices); + klist_add_tail(&dev->knode_driver, &dev->driver->p->klist_devices); } static int driver_sysfs_add(struct device *dev) { int ret; - ret = sysfs_create_link(&dev->driver->kobj, &dev->kobj, + ret = sysfs_create_link(&dev->driver->p->kobj, &dev->kobj, kobject_name(&dev->kobj)); if (ret == 0) { - ret = sysfs_create_link(&dev->kobj, &dev->driver->kobj, + ret = sysfs_create_link(&dev->kobj, &dev->driver->p->kobj, "driver"); if (ret) - sysfs_remove_link(&dev->driver->kobj, + sysfs_remove_link(&dev->driver->p->kobj, kobject_name(&dev->kobj)); } return ret; @@ -65,7 +65,7 @@ static void driver_sysfs_remove(struct device *dev) struct device_driver *drv = dev->driver; if (drv) { - sysfs_remove_link(&drv->kobj, kobject_name(&dev->kobj)); + sysfs_remove_link(&drv->p->kobj, kobject_name(&dev->kobj)); sysfs_remove_link(&dev->kobj, "driver"); } } @@ -339,15 +339,15 @@ void driver_detach(struct device_driver * drv) struct device * dev; for (;;) { - spin_lock(&drv->klist_devices.k_lock); - if (list_empty(&drv->klist_devices.k_list)) { - spin_unlock(&drv->klist_devices.k_lock); + spin_lock(&drv->p->klist_devices.k_lock); + if (list_empty(&drv->p->klist_devices.k_list)) { + spin_unlock(&drv->p->klist_devices.k_lock); break; } - dev = list_entry(drv->klist_devices.k_list.prev, + dev = list_entry(drv->p->klist_devices.k_list.prev, struct device, knode_driver.n_node); get_device(dev); - spin_unlock(&drv->klist_devices.k_lock); + spin_unlock(&drv->p->klist_devices.k_lock); if (dev->parent) /* Needed for USB */ down(&dev->parent->sem); diff --git a/drivers/base/driver.c b/drivers/base/driver.c index 633ae1d70e14..5aacff208f21 100644 --- a/drivers/base/driver.c +++ b/drivers/base/driver.c @@ -3,6 +3,8 @@ * * Copyright (c) 2002-3 Patrick Mochel * Copyright (c) 2002-3 Open Source Development Labs + * Copyright (c) 2007 Greg Kroah-Hartman + * Copyright (c) 2007 Novell Inc. * * This file is released under the GPLv2 * @@ -15,7 +17,6 @@ #include "base.h" #define to_dev(node) container_of(node, struct device, driver_list) -#define to_drv(obj) container_of(obj, struct device_driver, kobj) static struct device * next_device(struct klist_iter * i) @@ -44,7 +45,7 @@ int driver_for_each_device(struct device_driver * drv, struct device * start, if (!drv) return -EINVAL; - klist_iter_init_node(&drv->klist_devices, &i, + klist_iter_init_node(&drv->p->klist_devices, &i, start ? &start->knode_driver : NULL); while ((dev = next_device(&i)) && !error) error = fn(dev, data); @@ -80,7 +81,7 @@ struct device * driver_find_device(struct device_driver *drv, if (!drv) return NULL; - klist_iter_init_node(&drv->klist_devices, &i, + klist_iter_init_node(&drv->p->klist_devices, &i, (start ? &start->knode_driver : NULL)); while ((dev = next_device(&i))) if (match(dev, data) && get_device(dev)) @@ -100,7 +101,7 @@ int driver_create_file(struct device_driver * drv, struct driver_attribute * att { int error; if (get_driver(drv)) { - error = sysfs_create_file(&drv->kobj, &attr->attr); + error = sysfs_create_file(&drv->p->kobj, &attr->attr); put_driver(drv); } else error = -EINVAL; @@ -117,7 +118,7 @@ int driver_create_file(struct device_driver * drv, struct driver_attribute * att void driver_remove_file(struct device_driver * drv, struct driver_attribute * attr) { if (get_driver(drv)) { - sysfs_remove_file(&drv->kobj, &attr->attr); + sysfs_remove_file(&drv->p->kobj, &attr->attr); put_driver(drv); } } @@ -143,7 +144,7 @@ int driver_add_kobj(struct device_driver *drv, struct kobject *kobj, if (!name) return -ENOMEM; - return kobject_add_ng(kobj, &drv->kobj, "%s", name); + return kobject_add_ng(kobj, &drv->p->kobj, "%s", name); } EXPORT_SYMBOL_GPL(driver_add_kobj); @@ -153,7 +154,15 @@ EXPORT_SYMBOL_GPL(driver_add_kobj); */ struct device_driver * get_driver(struct device_driver * drv) { - return drv ? to_drv(kobject_get(&drv->kobj)) : NULL; + if (drv) { + struct driver_private *priv; + struct kobject *kobj; + + kobj = kobject_get(&drv->p->kobj); + priv = to_driver(kobj); + return priv->driver; + } + return NULL; } @@ -163,7 +172,7 @@ struct device_driver * get_driver(struct device_driver * drv) */ void put_driver(struct device_driver * drv) { - kobject_put(&drv->kobj); + kobject_put(&drv->p->kobj); } static int driver_add_groups(struct device_driver *drv, @@ -174,10 +183,10 @@ static int driver_add_groups(struct device_driver *drv, if (groups) { for (i = 0; groups[i]; i++) { - error = sysfs_create_group(&drv->kobj, groups[i]); + error = sysfs_create_group(&drv->p->kobj, groups[i]); if (error) { while (--i >= 0) - sysfs_remove_group(&drv->kobj, + sysfs_remove_group(&drv->p->kobj, groups[i]); break; } @@ -193,7 +202,7 @@ static void driver_remove_groups(struct device_driver *drv, if (groups) for (i = 0; groups[i]; i++) - sysfs_remove_group(&drv->kobj, groups[i]); + sysfs_remove_group(&drv->p->kobj, groups[i]); } @@ -214,7 +223,6 @@ int driver_register(struct device_driver * drv) (drv->bus->shutdown && drv->shutdown)) { printk(KERN_WARNING "Driver '%s' needs updating - please use bus_type methods\n", drv->name); } - klist_init(&drv->klist_devices, NULL, NULL); ret = bus_add_driver(drv); if (ret) return ret; @@ -250,8 +258,12 @@ 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->p->drivers_kset, name); - if (k) - return to_drv(k); + struct driver_private *priv; + + if (k) { + priv = to_driver(k); + return priv->driver; + } return NULL; } diff --git a/drivers/base/module.c b/drivers/base/module.c index cad07be5de1a..103be9cacb05 100644 --- a/drivers/base/module.c +++ b/drivers/base/module.c @@ -50,7 +50,7 @@ void module_add_driver(struct module *mod, struct device_driver *drv) if (mkobj) { mk = container_of(mkobj, struct module_kobject, kobj); /* remember our module structure */ - drv->mkobj = mk; + drv->p->mkobj = mk; /* kset_find_obj took a reference */ kobject_put(mkobj); } @@ -60,11 +60,11 @@ void module_add_driver(struct module *mod, struct device_driver *drv) return; /* Don't check return codes; these calls are idempotent */ - no_warn = sysfs_create_link(&drv->kobj, &mk->kobj, "module"); + no_warn = sysfs_create_link(&drv->p->kobj, &mk->kobj, "module"); driver_name = make_driver_name(drv); if (driver_name) { module_create_drivers_dir(mk); - no_warn = sysfs_create_link(mk->drivers_dir, &drv->kobj, + no_warn = sysfs_create_link(mk->drivers_dir, &drv->p->kobj, driver_name); kfree(driver_name); } @@ -78,12 +78,12 @@ void module_remove_driver(struct device_driver *drv) if (!drv) return; - sysfs_remove_link(&drv->kobj, "module"); + sysfs_remove_link(&drv->p->kobj, "module"); if (drv->owner) mk = &drv->owner->mkobj; - else if (drv->mkobj) - mk = drv->mkobj; + else if (drv->p->mkobj) + mk = drv->p->mkobj; if (mk && mk->drivers_dir) { driver_name = make_driver_name(drv); if (driver_name) { diff --git a/drivers/base/platform.c b/drivers/base/platform.c index d56a05f94f67..bdd59e8358f0 100644 --- a/drivers/base/platform.c +++ b/drivers/base/platform.c @@ -499,7 +499,7 @@ int __init_or_module platform_driver_probe(struct platform_driver *drv, */ spin_lock(&platform_bus_type.p->klist_drivers.k_lock); drv->probe = NULL; - if (code == 0 && list_empty(&drv->driver.klist_devices.k_list)) + if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list)) retval = -ENODEV; drv->driver.probe = platform_drv_probe_fail; spin_unlock(&platform_bus_type.p->klist_drivers.k_lock); diff --git a/include/linux/device.h b/include/linux/device.h index 721ee318d57b..92ba3a874627 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -32,6 +32,7 @@ struct device; struct device_driver; +struct driver_private; struct class; struct class_device; struct bus_type; @@ -113,16 +114,11 @@ extern struct kset *bus_get_kset(struct bus_type *bus); extern struct klist *bus_get_device_klist(struct bus_type *bus); struct device_driver { - const char * name; - struct bus_type * bus; - - struct kobject kobj; - struct klist klist_devices; - struct klist_node knode_bus; + const char *name; + struct bus_type *bus; - struct module * owner; - const char * mod_name; /* used for built-in modules */ - struct module_kobject * mkobj; + struct module *owner; + const char *mod_name; /* used for built-in modules */ int (*probe) (struct device * dev); int (*remove) (struct device * dev); @@ -130,6 +126,8 @@ struct device_driver { int (*suspend) (struct device * dev, pm_message_t state); int (*resume) (struct device * dev); struct attribute_group **groups; + + struct driver_private *p; }; -- cgit v1.2.3