[v1,1/8] software node: Free resources explicitly when swnode_register() fails

Commit Message

Andy Shevchenko March 27, 2021, 10:20 p.m. UTC

Currently we have a slightly twisted logic in swnode_register().
It frees resources that it doesn't allocate on error path and
in once case it relies on the ->release() implementation.

Untwist the logic by freeing resources explicitly when swnode_register()
fails. Currently it happens only in fwnode_create_software_node().

Signed-off-by: Andy Shevchenko <[e-mail]>
---
 drivers/base/swnode.c | 29 +++++++++++++++++------------
 1 file changed, 17 insertions(+), 12 deletions(-)

Patch

diff --git a/drivers/base/swnode.c b/drivers/base/swnode.c
index fa3719ef80e4..456f5fe58b58 100644
--- a/drivers/base/swnode.c
+++ b/drivers/base/swnode.c
@@ -767,22 +767,19 @@  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 +800,17 @@  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);
 }
 
 /**
@@ -963,6 +961,7 @@  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;
@@ -987,7 +986,13 @@  fwnode_create_software_node(const struct property_entry *properties,
 
 	node->parent = p ? p->node : NULL;
 
-	return swnode_register(node, p, 1);
+	fwnode = swnode_register(node, p, 1);
+	if (IS_ERR(fwnode)) {
+		property_entries_free(node->properties);
+		kfree(node);
+	}
+
+	return fwnode;
 }
 EXPORT_SYMBOL_GPL(fwnode_create_software_node);