mirror of https://gitee.com/openkylin/linux.git
sysfs, driver-core: remove unused {sysfs|device}_schedule_callback_owner()
All device_schedule_callback_owner() users are converted to use
device_remove_file_self(). Remove now unused
{sysfs|device}_schedule_callback_owner().
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tejun Heo
Greg Kroah-Hartman
parent
4afddd60a7
commit
33ac1257ff
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@ -614,39 +614,6 @@ void device_remove_bin_file(struct device *dev,
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}
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EXPORT_SYMBOL_GPL(device_remove_bin_file);
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/**
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* device_schedule_callback_owner - helper to schedule a callback for a device
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* @dev: device.
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* @func: callback function to invoke later.
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* @owner: module owning the callback routine
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*
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* Attribute methods must not unregister themselves or their parent device
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* (which would amount to the same thing). Attempts to do so will deadlock,
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* since unregistration is mutually exclusive with driver callbacks.
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*
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* Instead methods can call this routine, which will attempt to allocate
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* and schedule a workqueue request to call back @func with @dev as its
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* argument in the workqueue's process context. @dev will be pinned until
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* @func returns.
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*
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* This routine is usually called via the inline device_schedule_callback(),
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* which automatically sets @owner to THIS_MODULE.
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*
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* Returns 0 if the request was submitted, -ENOMEM if storage could not
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* be allocated, -ENODEV if a reference to @owner isn't available.
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*
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* NOTE: This routine won't work if CONFIG_SYSFS isn't set! It uses an
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* underlying sysfs routine (since it is intended for use by attribute
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* methods), and if sysfs isn't available you'll get nothing but -ENOSYS.
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*/
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int device_schedule_callback_owner(struct device *dev,
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void (*func)(struct device *), struct module *owner)
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{
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return sysfs_schedule_callback(&dev->kobj,
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(void (*)(void *)) func, dev, owner);
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}
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EXPORT_SYMBOL_GPL(device_schedule_callback_owner);
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static void klist_children_get(struct klist_node *n)
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{
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struct device_private *p = to_device_private_parent(n);
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@ -453,95 +453,3 @@ void sysfs_remove_bin_file(struct kobject *kobj,
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kernfs_remove_by_name(kobj->sd, attr->attr.name);
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}
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EXPORT_SYMBOL_GPL(sysfs_remove_bin_file);
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struct sysfs_schedule_callback_struct {
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struct list_head workq_list;
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struct kobject *kobj;
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void (*func)(void *);
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void *data;
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struct module *owner;
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struct work_struct work;
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};
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static struct workqueue_struct *sysfs_workqueue;
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static DEFINE_MUTEX(sysfs_workq_mutex);
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static LIST_HEAD(sysfs_workq);
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static void sysfs_schedule_callback_work(struct work_struct *work)
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{
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struct sysfs_schedule_callback_struct *ss = container_of(work,
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struct sysfs_schedule_callback_struct, work);
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(ss->func)(ss->data);
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kobject_put(ss->kobj);
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module_put(ss->owner);
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mutex_lock(&sysfs_workq_mutex);
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list_del(&ss->workq_list);
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mutex_unlock(&sysfs_workq_mutex);
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kfree(ss);
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}
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/**
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* sysfs_schedule_callback - helper to schedule a callback for a kobject
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* @kobj: object we're acting for.
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* @func: callback function to invoke later.
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* @data: argument to pass to @func.
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* @owner: module owning the callback code
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*
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* sysfs attribute methods must not unregister themselves or their parent
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* kobject (which would amount to the same thing). Attempts to do so will
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* deadlock, since unregistration is mutually exclusive with driver
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* callbacks.
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*
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* Instead methods can call this routine, which will attempt to allocate
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* and schedule a workqueue request to call back @func with @data as its
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* argument in the workqueue's process context. @kobj will be pinned
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* until @func returns.
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*
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* Returns 0 if the request was submitted, -ENOMEM if storage could not
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* be allocated, -ENODEV if a reference to @owner isn't available,
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* -EAGAIN if a callback has already been scheduled for @kobj.
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*/
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int sysfs_schedule_callback(struct kobject *kobj, void (*func)(void *),
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void *data, struct module *owner)
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{
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struct sysfs_schedule_callback_struct *ss, *tmp;
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if (!try_module_get(owner))
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return -ENODEV;
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mutex_lock(&sysfs_workq_mutex);
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list_for_each_entry_safe(ss, tmp, &sysfs_workq, workq_list)
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if (ss->kobj == kobj) {
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module_put(owner);
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mutex_unlock(&sysfs_workq_mutex);
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return -EAGAIN;
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}
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mutex_unlock(&sysfs_workq_mutex);
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if (sysfs_workqueue == NULL) {
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sysfs_workqueue = create_singlethread_workqueue("sysfsd");
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if (sysfs_workqueue == NULL) {
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module_put(owner);
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return -ENOMEM;
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}
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}
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ss = kmalloc(sizeof(*ss), GFP_KERNEL);
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if (!ss) {
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module_put(owner);
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return -ENOMEM;
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}
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kobject_get(kobj);
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ss->kobj = kobj;
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ss->func = func;
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ss->data = data;
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ss->owner = owner;
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INIT_WORK(&ss->work, sysfs_schedule_callback_work);
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INIT_LIST_HEAD(&ss->workq_list);
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mutex_lock(&sysfs_workq_mutex);
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list_add_tail(&ss->workq_list, &sysfs_workq);
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mutex_unlock(&sysfs_workq_mutex);
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queue_work(sysfs_workqueue, &ss->work);
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return 0;
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}
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EXPORT_SYMBOL_GPL(sysfs_schedule_callback);
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@ -566,12 +566,6 @@ extern int __must_check device_create_bin_file(struct device *dev,
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const struct bin_attribute *attr);
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extern void device_remove_bin_file(struct device *dev,
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const struct bin_attribute *attr);
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extern int device_schedule_callback_owner(struct device *dev,
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void (*func)(struct device *dev), struct module *owner);
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/* This is a macro to avoid include problems with THIS_MODULE */
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#define device_schedule_callback(dev, func) \
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device_schedule_callback_owner(dev, func, THIS_MODULE)
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/* device resource management */
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typedef void (*dr_release_t)(struct device *dev, void *res);
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@ -932,10 +926,7 @@ extern int device_online(struct device *dev);
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extern struct device *__root_device_register(const char *name,
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struct module *owner);
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/*
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* This is a macro to avoid include problems with THIS_MODULE,
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* just as per what is done for device_schedule_callback() above.
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*/
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/* This is a macro to avoid include problems with THIS_MODULE */
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#define root_device_register(name) \
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__root_device_register(name, THIS_MODULE)
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@ -179,9 +179,6 @@ struct sysfs_ops {
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#ifdef CONFIG_SYSFS
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int sysfs_schedule_callback(struct kobject *kobj, void (*func)(void *),
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void *data, struct module *owner);
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int __must_check sysfs_create_dir_ns(struct kobject *kobj, const void *ns);
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void sysfs_remove_dir(struct kobject *kobj);
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int __must_check sysfs_rename_dir_ns(struct kobject *kobj, const char *new_name,
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@ -255,12 +252,6 @@ static inline void sysfs_enable_ns(struct kernfs_node *kn)
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#else /* CONFIG_SYSFS */
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static inline int sysfs_schedule_callback(struct kobject *kobj,
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void (*func)(void *), void *data, struct module *owner)
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{
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return -ENOSYS;
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}
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static inline int sysfs_create_dir_ns(struct kobject *kobj, const void *ns)
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{
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return 0;
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