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path: root/drivers/base/swnode.c
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Diffstat (limited to 'drivers/base/swnode.c')
-rw-r--r--drivers/base/swnode.c106
1 files changed, 60 insertions, 46 deletions
diff --git a/drivers/base/swnode.c b/drivers/base/swnode.c
index fa3719ef80e4..3cc11b813f28 100644
--- a/drivers/base/swnode.c
+++ b/drivers/base/swnode.c
@@ -12,10 +12,10 @@
#include <linux/slab.h>
struct swnode {
- int id;
struct kobject kobj;
struct fwnode_handle fwnode;
const struct software_node *node;
+ int id;
/* hierarchy */
struct ida child_ids;
@@ -720,19 +720,30 @@ software_node_find_by_name(const struct software_node *parent, const char *name)
}
EXPORT_SYMBOL_GPL(software_node_find_by_name);
-static int
-software_node_register_properties(struct software_node *node,
- const struct property_entry *properties)
+static struct software_node *software_node_alloc(const struct property_entry *properties)
{
struct property_entry *props;
+ struct software_node *node;
props = property_entries_dup(properties);
if (IS_ERR(props))
- return PTR_ERR(props);
+ return ERR_CAST(props);
+
+ node = kzalloc(sizeof(*node), GFP_KERNEL);
+ if (!node) {
+ property_entries_free(props);
+ return ERR_PTR(-ENOMEM);
+ }
node->properties = props;
- return 0;
+ return node;
+}
+
+static void software_node_free(const struct software_node *node)
+{
+ property_entries_free(node->properties);
+ kfree(node);
}
static void software_node_release(struct kobject *kobj)
@@ -746,10 +757,9 @@ static void software_node_release(struct kobject *kobj)
ida_simple_remove(&swnode_root_ids, swnode->id);
}
- if (swnode->allocated) {
- property_entries_free(swnode->node->properties);
- kfree(swnode->node);
- }
+ if (swnode->allocated)
+ software_node_free(swnode->node);
+
ida_destroy(&swnode->child_ids);
kfree(swnode);
}
@@ -767,22 +777,19 @@ swnode_register(const struct software_node *node, struct swnode *parent,
int ret;
swnode = kzalloc(sizeof(*swnode), GFP_KERNEL);
- if (!swnode) {
- ret = -ENOMEM;
- goto out_err;
- }
+ if (!swnode)
+ return ERR_PTR(-ENOMEM);
ret = ida_simple_get(parent ? &parent->child_ids : &swnode_root_ids,
0, 0, GFP_KERNEL);
if (ret < 0) {
kfree(swnode);
- goto out_err;
+ return ERR_PTR(ret);
}
swnode->id = ret;
swnode->node = node;
swnode->parent = parent;
- swnode->allocated = allocated;
swnode->kobj.kset = swnode_kset;
fwnode_init(&swnode->fwnode, &software_node_ops);
@@ -803,16 +810,17 @@ swnode_register(const struct software_node *node, struct swnode *parent,
return ERR_PTR(ret);
}
+ /*
+ * Assign the flag only in the successful case, so
+ * the above kobject_put() won't mess up with properties.
+ */
+ swnode->allocated = allocated;
+
if (parent)
list_add_tail(&swnode->entry, &parent->children);
kobject_uevent(&swnode->kobj, KOBJ_ADD);
return &swnode->fwnode;
-
-out_err:
- if (allocated)
- property_entries_free(node->properties);
- return ERR_PTR(ret);
}
/**
@@ -880,7 +888,11 @@ EXPORT_SYMBOL_GPL(software_node_unregister_nodes);
* software_node_register_node_group - Register a group of software nodes
* @node_group: NULL terminated array of software node pointers to be registered
*
- * Register multiple software nodes at once.
+ * Register multiple software nodes at once. If any node in the array
+ * has its .parent pointer set (which can only be to another software_node),
+ * then its parent **must** have been registered before it is; either outside
+ * of this function or by ordering the array such that parent comes before
+ * child.
*/
int software_node_register_node_group(const struct software_node **node_group)
{
@@ -906,10 +918,14 @@ EXPORT_SYMBOL_GPL(software_node_register_node_group);
* software_node_unregister_node_group - Unregister a group of software nodes
* @node_group: NULL terminated array of software node pointers to be unregistered
*
- * Unregister multiple software nodes at once. The array will be unwound in
- * reverse order (i.e. last entry first) and thus if any members of the array are
- * children of another member then the children must appear later in the list such
- * that they are unregistered first.
+ * Unregister multiple software nodes at once. If parent pointers are set up
+ * in any of the software nodes then the array **must** be ordered such that
+ * parents come before their children.
+ *
+ * NOTE: If you are uncertain whether the array is ordered such that
+ * parents will be unregistered before their children, it is wiser to
+ * remove the nodes individually, in the correct order (child before
+ * parent).
*/
void software_node_unregister_node_group(
const struct software_node **node_group)
@@ -963,31 +979,28 @@ struct fwnode_handle *
fwnode_create_software_node(const struct property_entry *properties,
const struct fwnode_handle *parent)
{
+ struct fwnode_handle *fwnode;
struct software_node *node;
- struct swnode *p = NULL;
- int ret;
+ struct swnode *p;
- if (parent) {
- if (IS_ERR(parent))
- return ERR_CAST(parent);
- if (!is_software_node(parent))
- return ERR_PTR(-EINVAL);
- p = to_swnode(parent);
- }
+ if (IS_ERR(parent))
+ return ERR_CAST(parent);
- node = kzalloc(sizeof(*node), GFP_KERNEL);
- if (!node)
- return ERR_PTR(-ENOMEM);
+ p = to_swnode(parent);
+ if (parent && !p)
+ return ERR_PTR(-EINVAL);
- ret = software_node_register_properties(node, properties);
- if (ret) {
- kfree(node);
- return ERR_PTR(ret);
- }
+ node = software_node_alloc(properties);
+ if (IS_ERR(node))
+ return ERR_CAST(node);
node->parent = p ? p->node : NULL;
- return swnode_register(node, p, 1);
+ fwnode = swnode_register(node, p, 1);
+ if (IS_ERR(fwnode))
+ software_node_free(node);
+
+ return fwnode;
}
EXPORT_SYMBOL_GPL(fwnode_create_software_node);
@@ -1032,6 +1045,7 @@ int device_add_software_node(struct device *dev, const struct software_node *nod
}
set_secondary_fwnode(dev, &swnode->fwnode);
+ software_node_notify(dev, KOBJ_ADD);
return 0;
}
@@ -1105,8 +1119,8 @@ int software_node_notify(struct device *dev, unsigned long action)
switch (action) {
case KOBJ_ADD:
- ret = sysfs_create_link(&dev->kobj, &swnode->kobj,
- "software_node");
+ ret = sysfs_create_link_nowarn(&dev->kobj, &swnode->kobj,
+ "software_node");
if (ret)
break;