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-rw-r--r--drivers/base/core.c150
1 files changed, 67 insertions, 83 deletions
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 8856d74545d9..c7cfadcf6752 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -26,6 +26,7 @@
#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 +37,9 @@ 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 +50,28 @@ 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 +368,7 @@ 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 +411,7 @@ 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 +422,20 @@ 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;
@@ -424,14 +445,15 @@ 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 struct device_attribute online_attr =
- __ATTR(online, S_IRUGO | S_IWUSR, show_online, store_online);
+static DEVICE_ATTR_RW(online);
static int device_add_attributes(struct device *dev,
struct device_attribute *attrs)
@@ -440,7 +462,7 @@ static int device_add_attributes(struct device *dev,
int i;
if (attrs) {
- for (i = 0; attr_name(attrs[i]); i++) {
+ for (i = 0; attrs[i].attr.name; i++) {
error = device_create_file(dev, &attrs[i]);
if (error)
break;
@@ -458,7 +480,7 @@ static void device_remove_attributes(struct device *dev,
int i;
if (attrs)
- for (i = 0; attr_name(attrs[i]); i++)
+ for (i = 0; attrs[i].attr.name; i++)
device_remove_file(dev, &attrs[i]);
}
@@ -469,7 +491,7 @@ static int device_add_bin_attributes(struct device *dev,
int i;
if (attrs) {
- for (i = 0; attr_name(attrs[i]); i++) {
+ for (i = 0; attrs[i].attr.name; i++) {
error = device_create_bin_file(dev, &attrs[i]);
if (error)
break;
@@ -487,38 +509,19 @@ static void device_remove_bin_attributes(struct device *dev,
int i;
if (attrs)
- for (i = 0; attr_name(attrs[i]); i++)
+ for (i = 0; attrs[i].attr.name; i++)
device_remove_bin_file(dev, &attrs[i]);
}
-static int device_add_groups(struct device *dev,
- const struct attribute_group **groups)
+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;
+ return sysfs_create_groups(&dev->kobj, groups);
}
-static void device_remove_groups(struct device *dev,
- const struct attribute_group **groups)
+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)
@@ -550,7 +553,7 @@ 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;
}
@@ -578,7 +581,7 @@ 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)
@@ -591,15 +594,12 @@ static void device_remove_attrs(struct device *dev)
}
}
-
-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 +626,7 @@ int device_create_file(struct device *dev,
return error;
}
+EXPORT_SYMBOL_GPL(device_create_file);
/**
* device_remove_file - remove sysfs attribute file.
@@ -638,6 +639,7 @@ void device_remove_file(struct device *dev,
if (dev)
sysfs_remove_file(&dev->kobj, &attr->attr);
}
+EXPORT_SYMBOL_GPL(device_remove_file);
/**
* device_create_bin_file - create sysfs binary attribute file for device.
@@ -748,6 +750,7 @@ 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 +1103,12 @@ 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 +1175,9 @@ 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 +1190,7 @@ name_error:
dev->p = NULL;
goto done;
}
+EXPORT_SYMBOL_GPL(device_add);
/**
* device_register - register a device with the system.
@@ -1211,6 +1215,7 @@ 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 +1229,7 @@ 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 +1241,7 @@ 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 +1273,7 @@ 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 +1288,7 @@ 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 +1304,7 @@ 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 +1323,7 @@ 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 +1412,7 @@ 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 +1447,7 @@ 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 +1475,6 @@ 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;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.