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Diffstat (limited to 'drivers/base/core.c')
-rw-r--r--drivers/base/core.c304
1 files changed, 100 insertions, 204 deletions
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 8856d74545d..20da3ad1696 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -23,9 +23,9 @@
#include <linux/genhd.h>
#include <linux/kallsyms.h>
#include <linux/mutex.h>
-#include <linux/async.h>
#include <linux/pm_runtime.h>
#include <linux/netdevice.h>
+#include <linux/sysfs.h>
#include "base.h"
#include "power/power.h"
@@ -36,9 +36,9 @@ long sysfs_deprecated = 1;
#else
long sysfs_deprecated = 0;
#endif
-static __init int sysfs_deprecated_setup(char *arg)
+static int __init sysfs_deprecated_setup(char *arg)
{
- return strict_strtol(arg, 10, &sysfs_deprecated);
+ return kstrtol(arg, 10, &sysfs_deprecated);
}
early_param("sysfs.deprecated", sysfs_deprecated_setup);
#endif
@@ -49,6 +49,28 @@ static struct kobject *dev_kobj;
struct kobject *sysfs_dev_char_kobj;
struct kobject *sysfs_dev_block_kobj;
+static DEFINE_MUTEX(device_hotplug_lock);
+
+void lock_device_hotplug(void)
+{
+ mutex_lock(&device_hotplug_lock);
+}
+
+void unlock_device_hotplug(void)
+{
+ mutex_unlock(&device_hotplug_lock);
+}
+
+int lock_device_hotplug_sysfs(void)
+{
+ if (mutex_trylock(&device_hotplug_lock))
+ return 0;
+
+ /* Avoid busy looping (5 ms of sleep should do). */
+ msleep(5);
+ return restart_syscall();
+}
+
#ifdef CONFIG_BLOCK
static inline int device_is_not_partition(struct device *dev)
{
@@ -345,7 +367,7 @@ static const struct kset_uevent_ops device_uevent_ops = {
.uevent = dev_uevent,
};
-static ssize_t show_uevent(struct device *dev, struct device_attribute *attr,
+static ssize_t uevent_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct kobject *top_kobj;
@@ -388,7 +410,7 @@ out:
return count;
}
-static ssize_t store_uevent(struct device *dev, struct device_attribute *attr,
+static ssize_t uevent_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
enum kobject_action action;
@@ -399,22 +421,20 @@ static ssize_t store_uevent(struct device *dev, struct device_attribute *attr,
dev_err(dev, "uevent: unknown action-string\n");
return count;
}
+static DEVICE_ATTR_RW(uevent);
-static struct device_attribute uevent_attr =
- __ATTR(uevent, S_IRUGO | S_IWUSR, show_uevent, store_uevent);
-
-static ssize_t show_online(struct device *dev, struct device_attribute *attr,
+static ssize_t online_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
bool val;
- lock_device_hotplug();
+ device_lock(dev);
val = !dev->offline;
- unlock_device_hotplug();
+ device_unlock(dev);
return sprintf(buf, "%u\n", val);
}
-static ssize_t store_online(struct device *dev, struct device_attribute *attr,
+static ssize_t online_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
bool val;
@@ -424,101 +444,25 @@ static ssize_t store_online(struct device *dev, struct device_attribute *attr,
if (ret < 0)
return ret;
- lock_device_hotplug();
+ ret = lock_device_hotplug_sysfs();
+ if (ret)
+ return ret;
+
ret = val ? device_online(dev) : device_offline(dev);
unlock_device_hotplug();
return ret < 0 ? ret : count;
}
+static DEVICE_ATTR_RW(online);
-static struct device_attribute online_attr =
- __ATTR(online, S_IRUGO | S_IWUSR, show_online, store_online);
-
-static int device_add_attributes(struct device *dev,
- struct device_attribute *attrs)
+int device_add_groups(struct device *dev, const struct attribute_group **groups)
{
- int error = 0;
- int i;
-
- if (attrs) {
- for (i = 0; attr_name(attrs[i]); i++) {
- error = device_create_file(dev, &attrs[i]);
- if (error)
- break;
- }
- if (error)
- while (--i >= 0)
- device_remove_file(dev, &attrs[i]);
- }
- return error;
+ return sysfs_create_groups(&dev->kobj, groups);
}
-static void device_remove_attributes(struct device *dev,
- struct device_attribute *attrs)
+void device_remove_groups(struct device *dev,
+ const struct attribute_group **groups)
{
- int i;
-
- if (attrs)
- for (i = 0; attr_name(attrs[i]); i++)
- device_remove_file(dev, &attrs[i]);
-}
-
-static int device_add_bin_attributes(struct device *dev,
- struct bin_attribute *attrs)
-{
- int error = 0;
- int i;
-
- if (attrs) {
- for (i = 0; attr_name(attrs[i]); i++) {
- error = device_create_bin_file(dev, &attrs[i]);
- if (error)
- break;
- }
- if (error)
- while (--i >= 0)
- device_remove_bin_file(dev, &attrs[i]);
- }
- return error;
-}
-
-static void device_remove_bin_attributes(struct device *dev,
- struct bin_attribute *attrs)
-{
- int i;
-
- if (attrs)
- for (i = 0; attr_name(attrs[i]); i++)
- device_remove_bin_file(dev, &attrs[i]);
-}
-
-static int device_add_groups(struct device *dev,
- const struct attribute_group **groups)
-{
- int error = 0;
- int i;
-
- if (groups) {
- for (i = 0; groups[i]; i++) {
- error = sysfs_create_group(&dev->kobj, groups[i]);
- if (error) {
- while (--i >= 0)
- sysfs_remove_group(&dev->kobj,
- groups[i]);
- break;
- }
- }
- }
- return error;
-}
-
-static void device_remove_groups(struct device *dev,
- const struct attribute_group **groups)
-{
- int i;
-
- if (groups)
- for (i = 0; groups[i]; i++)
- sysfs_remove_group(&dev->kobj, groups[i]);
+ sysfs_remove_groups(&dev->kobj, groups);
}
static int device_add_attrs(struct device *dev)
@@ -531,18 +475,12 @@ static int device_add_attrs(struct device *dev)
error = device_add_groups(dev, class->dev_groups);
if (error)
return error;
- error = device_add_attributes(dev, class->dev_attrs);
- if (error)
- goto err_remove_class_groups;
- error = device_add_bin_attributes(dev, class->dev_bin_attrs);
- if (error)
- goto err_remove_class_attrs;
}
if (type) {
error = device_add_groups(dev, type->groups);
if (error)
- goto err_remove_class_bin_attrs;
+ goto err_remove_class_groups;
}
error = device_add_groups(dev, dev->groups);
@@ -550,22 +488,18 @@ static int device_add_attrs(struct device *dev)
goto err_remove_type_groups;
if (device_supports_offline(dev) && !dev->offline_disabled) {
- error = device_create_file(dev, &online_attr);
+ error = device_create_file(dev, &dev_attr_online);
if (error)
- goto err_remove_type_groups;
+ goto err_remove_dev_groups;
}
return 0;
+ err_remove_dev_groups:
+ device_remove_groups(dev, dev->groups);
err_remove_type_groups:
if (type)
device_remove_groups(dev, type->groups);
- err_remove_class_bin_attrs:
- if (class)
- device_remove_bin_attributes(dev, class->dev_bin_attrs);
- err_remove_class_attrs:
- if (class)
- device_remove_attributes(dev, class->dev_attrs);
err_remove_class_groups:
if (class)
device_remove_groups(dev, class->dev_groups);
@@ -578,28 +512,22 @@ static void device_remove_attrs(struct device *dev)
struct class *class = dev->class;
const struct device_type *type = dev->type;
- device_remove_file(dev, &online_attr);
+ device_remove_file(dev, &dev_attr_online);
device_remove_groups(dev, dev->groups);
if (type)
device_remove_groups(dev, type->groups);
- if (class) {
- device_remove_attributes(dev, class->dev_attrs);
- device_remove_bin_attributes(dev, class->dev_bin_attrs);
+ if (class)
device_remove_groups(dev, class->dev_groups);
- }
}
-
-static ssize_t show_dev(struct device *dev, struct device_attribute *attr,
+static ssize_t dev_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
return print_dev_t(buf, dev->devt);
}
-
-static struct device_attribute devt_attr =
- __ATTR(dev, S_IRUGO, show_dev, NULL);
+static DEVICE_ATTR_RO(dev);
/* /sys/devices/ */
struct kset *devices_kset;
@@ -626,6 +554,7 @@ int device_create_file(struct device *dev,
return error;
}
+EXPORT_SYMBOL_GPL(device_create_file);
/**
* device_remove_file - remove sysfs attribute file.
@@ -638,6 +567,24 @@ void device_remove_file(struct device *dev,
if (dev)
sysfs_remove_file(&dev->kobj, &attr->attr);
}
+EXPORT_SYMBOL_GPL(device_remove_file);
+
+/**
+ * device_remove_file_self - remove sysfs attribute file from its own method.
+ * @dev: device.
+ * @attr: device attribute descriptor.
+ *
+ * See kernfs_remove_self() for details.
+ */
+bool device_remove_file_self(struct device *dev,
+ const struct device_attribute *attr)
+{
+ if (dev)
+ return sysfs_remove_file_self(&dev->kobj, &attr->attr);
+ else
+ return false;
+}
+EXPORT_SYMBOL_GPL(device_remove_file_self);
/**
* device_create_bin_file - create sysfs binary attribute file for device.
@@ -667,39 +614,6 @@ void device_remove_bin_file(struct device *dev,
}
EXPORT_SYMBOL_GPL(device_remove_bin_file);
-/**
- * device_schedule_callback_owner - helper to schedule a callback for a device
- * @dev: device.
- * @func: callback function to invoke later.
- * @owner: module owning the callback routine
- *
- * Attribute methods must not unregister themselves or their parent device
- * (which would amount to the same thing). Attempts to do so will deadlock,
- * since unregistration is mutually exclusive with driver callbacks.
- *
- * Instead methods can call this routine, which will attempt to allocate
- * and schedule a workqueue request to call back @func with @dev as its
- * argument in the workqueue's process context. @dev will be pinned until
- * @func returns.
- *
- * This routine is usually called via the inline device_schedule_callback(),
- * which automatically sets @owner to THIS_MODULE.
- *
- * Returns 0 if the request was submitted, -ENOMEM if storage could not
- * be allocated, -ENODEV if a reference to @owner isn't available.
- *
- * NOTE: This routine won't work if CONFIG_SYSFS isn't set! It uses an
- * underlying sysfs routine (since it is intended for use by attribute
- * methods), and if sysfs isn't available you'll get nothing but -ENOSYS.
- */
-int device_schedule_callback_owner(struct device *dev,
- void (*func)(struct device *), struct module *owner)
-{
- return sysfs_schedule_callback(&dev->kobj,
- (void (*)(void *)) func, dev, owner);
-}
-EXPORT_SYMBOL_GPL(device_schedule_callback_owner);
-
static void klist_children_get(struct klist_node *n)
{
struct device_private *p = to_device_private_parent(n);
@@ -748,6 +662,7 @@ void device_initialize(struct device *dev)
device_pm_init(dev);
set_dev_node(dev, -1);
}
+EXPORT_SYMBOL_GPL(device_initialize);
struct kobject *virtual_device_parent(struct device *dev)
{
@@ -1100,12 +1015,12 @@ int device_add(struct device *dev)
if (platform_notify)
platform_notify(dev);
- error = device_create_file(dev, &uevent_attr);
+ error = device_create_file(dev, &dev_attr_uevent);
if (error)
goto attrError;
if (MAJOR(dev->devt)) {
- error = device_create_file(dev, &devt_attr);
+ error = device_create_file(dev, &dev_attr_dev);
if (error)
goto ueventattrError;
@@ -1172,9 +1087,9 @@ done:
device_remove_sys_dev_entry(dev);
devtattrError:
if (MAJOR(dev->devt))
- device_remove_file(dev, &devt_attr);
+ device_remove_file(dev, &dev_attr_dev);
ueventattrError:
- device_remove_file(dev, &uevent_attr);
+ device_remove_file(dev, &dev_attr_uevent);
attrError:
kobject_uevent(&dev->kobj, KOBJ_REMOVE);
kobject_del(&dev->kobj);
@@ -1187,6 +1102,7 @@ name_error:
dev->p = NULL;
goto done;
}
+EXPORT_SYMBOL_GPL(device_add);
/**
* device_register - register a device with the system.
@@ -1211,6 +1127,7 @@ int device_register(struct device *dev)
device_initialize(dev);
return device_add(dev);
}
+EXPORT_SYMBOL_GPL(device_register);
/**
* get_device - increment reference count for device.
@@ -1224,6 +1141,7 @@ struct device *get_device(struct device *dev)
{
return dev ? kobj_to_dev(kobject_get(&dev->kobj)) : NULL;
}
+EXPORT_SYMBOL_GPL(get_device);
/**
* put_device - decrement reference count.
@@ -1235,6 +1153,7 @@ void put_device(struct device *dev)
if (dev)
kobject_put(&dev->kobj);
}
+EXPORT_SYMBOL_GPL(put_device);
/**
* device_del - delete device from system.
@@ -1266,7 +1185,7 @@ void device_del(struct device *dev)
if (MAJOR(dev->devt)) {
devtmpfs_delete_node(dev);
device_remove_sys_dev_entry(dev);
- device_remove_file(dev, &devt_attr);
+ device_remove_file(dev, &dev_attr_dev);
}
if (dev->class) {
device_remove_class_symlinks(dev);
@@ -1281,7 +1200,7 @@ void device_del(struct device *dev)
klist_del(&dev->knode_class);
mutex_unlock(&dev->class->p->mutex);
}
- device_remove_file(dev, &uevent_attr);
+ device_remove_file(dev, &dev_attr_uevent);
device_remove_attrs(dev);
bus_remove_device(dev);
device_pm_remove(dev);
@@ -1297,6 +1216,7 @@ void device_del(struct device *dev)
kobject_del(&dev->kobj);
put_device(parent);
}
+EXPORT_SYMBOL_GPL(device_del);
/**
* device_unregister - unregister device from system.
@@ -1315,6 +1235,7 @@ void device_unregister(struct device *dev)
device_del(dev);
put_device(dev);
}
+EXPORT_SYMBOL_GPL(device_unregister);
static struct device *next_device(struct klist_iter *i)
{
@@ -1403,6 +1324,7 @@ int device_for_each_child(struct device *parent, void *data,
klist_iter_exit(&i);
return error;
}
+EXPORT_SYMBOL_GPL(device_for_each_child);
/**
* device_find_child - device iterator for locating a particular device.
@@ -1437,6 +1359,7 @@ struct device *device_find_child(struct device *parent, void *data,
klist_iter_exit(&i);
return child;
}
+EXPORT_SYMBOL_GPL(device_find_child);
int __init devices_init(void)
{
@@ -1464,33 +1387,6 @@ int __init devices_init(void)
return -ENOMEM;
}
-EXPORT_SYMBOL_GPL(device_for_each_child);
-EXPORT_SYMBOL_GPL(device_find_child);
-
-EXPORT_SYMBOL_GPL(device_initialize);
-EXPORT_SYMBOL_GPL(device_add);
-EXPORT_SYMBOL_GPL(device_register);
-
-EXPORT_SYMBOL_GPL(device_del);
-EXPORT_SYMBOL_GPL(device_unregister);
-EXPORT_SYMBOL_GPL(get_device);
-EXPORT_SYMBOL_GPL(put_device);
-
-EXPORT_SYMBOL_GPL(device_create_file);
-EXPORT_SYMBOL_GPL(device_remove_file);
-
-static DEFINE_MUTEX(device_hotplug_lock);
-
-void lock_device_hotplug(void)
-{
- mutex_lock(&device_hotplug_lock);
-}
-
-void unlock_device_hotplug(void)
-{
- mutex_unlock(&device_hotplug_lock);
-}
-
static int device_check_offline(struct device *dev, void *not_used)
{
int ret;
@@ -1692,6 +1588,7 @@ device_create_groups_vargs(struct class *class, struct device *parent,
goto error;
}
+ device_initialize(dev);
dev->devt = devt;
dev->class = class;
dev->parent = parent;
@@ -1703,7 +1600,7 @@ device_create_groups_vargs(struct class *class, struct device *parent,
if (retval)
goto error;
- retval = device_register(dev);
+ retval = device_add(dev);
if (retval)
goto error;
@@ -1897,6 +1794,7 @@ EXPORT_SYMBOL_GPL(device_destroy);
*/
int device_rename(struct device *dev, const char *new_name)
{
+ struct kobject *kobj = &dev->kobj;
char *old_device_name = NULL;
int error;
@@ -1904,8 +1802,7 @@ int device_rename(struct device *dev, const char *new_name)
if (!dev)
return -EINVAL;
- pr_debug("device: '%s': %s: renaming to '%s'\n", dev_name(dev),
- __func__, new_name);
+ dev_dbg(dev, "renaming to %s\n", new_name);
old_device_name = kstrdup(dev_name(dev), GFP_KERNEL);
if (!old_device_name) {
@@ -1914,13 +1811,14 @@ int device_rename(struct device *dev, const char *new_name)
}
if (dev->class) {
- error = sysfs_rename_link(&dev->class->p->subsys.kobj,
- &dev->kobj, old_device_name, new_name);
+ error = sysfs_rename_link_ns(&dev->class->p->subsys.kobj,
+ kobj, old_device_name,
+ new_name, kobject_namespace(kobj));
if (error)
goto out;
}
- error = kobject_rename(&dev->kobj, new_name);
+ error = kobject_rename(kobj, new_name);
if (error)
goto out;
@@ -2033,7 +1931,7 @@ EXPORT_SYMBOL_GPL(device_move);
*/
void device_shutdown(void)
{
- struct device *dev;
+ struct device *dev, *parent;
spin_lock(&devices_kset->list_lock);
/*
@@ -2050,7 +1948,7 @@ void device_shutdown(void)
* prevent it from being freed because parent's
* lock is to be held
*/
- get_device(dev->parent);
+ parent = get_device(dev->parent);
get_device(dev);
/*
* Make sure the device is off the kset list, in the
@@ -2060,8 +1958,8 @@ void device_shutdown(void)
spin_unlock(&devices_kset->list_lock);
/* hold lock to avoid race with probe/release */
- if (dev->parent)
- device_lock(dev->parent);
+ if (parent)
+ device_lock(parent);
device_lock(dev);
/* Don't allow any more runtime suspends */
@@ -2079,16 +1977,15 @@ void device_shutdown(void)
}
device_unlock(dev);
- if (dev->parent)
- device_unlock(dev->parent);
+ if (parent)
+ device_unlock(parent);
put_device(dev);
- put_device(dev->parent);
+ put_device(parent);
spin_lock(&devices_kset->list_lock);
}
spin_unlock(&devices_kset->list_lock);
- async_synchronize_full();
}
/*
@@ -2143,7 +2040,6 @@ create_syslog_header(const struct device *dev, char *hdr, size_t hdrlen)
return pos;
}
-EXPORT_SYMBOL(create_syslog_header);
int dev_vprintk_emit(int level, const struct device *dev,
const char *fmt, va_list args)
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-10 09:40:31 +0000