summaryrefslogtreecommitdiffstats
path: root/drivers/base/attribute_container.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/base/attribute_container.c')
-rw-r--r--drivers/base/attribute_container.c43
1 files changed, 43 insertions, 0 deletions
diff --git a/drivers/base/attribute_container.c b/drivers/base/attribute_container.c
index ec615d854be..ebcae5c3413 100644
--- a/drivers/base/attribute_container.c
+++ b/drivers/base/attribute_container.c
@@ -58,6 +58,7 @@ attribute_container_register(struct attribute_container *cont)
{
INIT_LIST_HEAD(&cont->node);
INIT_LIST_HEAD(&cont->containers);
+ spin_lock_init(&cont->containers_lock);
down(&attribute_container_mutex);
list_add_tail(&cont->node, &attribute_container_list);
@@ -77,11 +78,13 @@ attribute_container_unregister(struct attribute_container *cont)
{
int retval = -EBUSY;
down(&attribute_container_mutex);
+ spin_lock(&cont->containers_lock);
if (!list_empty(&cont->containers))
goto out;
retval = 0;
list_del(&cont->node);
out:
+ spin_unlock(&cont->containers_lock);
up(&attribute_container_mutex);
return retval;
@@ -151,7 +154,9 @@ attribute_container_add_device(struct device *dev,
fn(cont, dev, &ic->classdev);
else
attribute_container_add_class_device(&ic->classdev);
+ spin_lock(&cont->containers_lock);
list_add_tail(&ic->node, &cont->containers);
+ spin_unlock(&cont->containers_lock);
}
up(&attribute_container_mutex);
}
@@ -189,6 +194,7 @@ attribute_container_remove_device(struct device *dev,
if (!cont->match(cont, dev))
continue;
+ spin_lock(&cont->containers_lock);
list_for_each_entry_safe(ic, tmp, &cont->containers, node) {
if (dev != ic->classdev.dev)
continue;
@@ -200,6 +206,7 @@ attribute_container_remove_device(struct device *dev,
class_device_unregister(&ic->classdev);
}
}
+ spin_unlock(&cont->containers_lock);
}
up(&attribute_container_mutex);
}
@@ -230,10 +237,17 @@ attribute_container_device_trigger(struct device *dev,
if (!cont->match(cont, dev))
continue;
+ if (attribute_container_no_classdevs(cont)) {
+ fn(cont, dev, NULL);
+ continue;
+ }
+
+ spin_lock(&cont->containers_lock);
list_for_each_entry_safe(ic, tmp, &cont->containers, node) {
if (dev == ic->classdev.dev)
fn(cont, dev, &ic->classdev);
}
+ spin_unlock(&cont->containers_lock);
}
up(&attribute_container_mutex);
}
@@ -368,6 +382,35 @@ attribute_container_class_device_del(struct class_device *classdev)
}
EXPORT_SYMBOL_GPL(attribute_container_class_device_del);
+/**
+ * attribute_container_find_class_device - find the corresponding class_device
+ *
+ * @cont: the container
+ * @dev: the generic device
+ *
+ * Looks up the device in the container's list of class devices and returns
+ * the corresponding class_device.
+ */
+struct class_device *
+attribute_container_find_class_device(struct attribute_container *cont,
+ struct device *dev)
+{
+ struct class_device *cdev = NULL;
+ struct internal_container *ic;
+
+ spin_lock(&cont->containers_lock);
+ list_for_each_entry(ic, &cont->containers, node) {
+ if (ic->classdev.dev == dev) {
+ cdev = &ic->classdev;
+ break;
+ }
+ }
+ spin_unlock(&cont->containers_lock);
+
+ return cdev;
+}
+EXPORT_SYMBOL_GPL(attribute_container_find_class_device);
+
int __init
attribute_container_init(void)
{