[PATCH v1 1/5] fpga: mgr: Use standard dev_release for class driver

[Russ Weight <russell.h.weight@xxxxxxxxx>]

The FPGA manager class driver data structure is being treated as a
managed resource instead of using the class.dev_release call-back
function to release the class data structure. This change populates
the class.dev_release function, changes the fpga_mgr_free() function
to call put_device() and changes the fpga_mgr_unregister() function
to call device_del() instead of device_unregister().

Signed-off-by: Russ Weight <russell.h.weight@xxxxxxxxx>
---
 drivers/fpga/fpga-mgr.c | 57 +++++++++++++++++++----------------------
 1 file changed, 26 insertions(+), 31 deletions(-)

diff --git a/drivers/fpga/fpga-mgr.c b/drivers/fpga/fpga-mgr.c
index b85bc47c91a9..1a4031c0771e 100644
--- a/drivers/fpga/fpga-mgr.c
+++ b/drivers/fpga/fpga-mgr.c
@@ -551,7 +551,7 @@ EXPORT_SYMBOL_GPL(fpga_mgr_unlock);
 
 /**
  * fpga_mgr_create - create and initialize a FPGA manager struct
- * @dev:	fpga manager device from pdev
+ * @parent:	fpga manager device from pdev
  * @name:	fpga manager name
  * @mops:	pointer to structure of fpga manager ops
  * @priv:	fpga manager private data
@@ -561,7 +561,7 @@ EXPORT_SYMBOL_GPL(fpga_mgr_unlock);
  *
  * Return: pointer to struct fpga_manager or NULL
  */
-struct fpga_manager *fpga_mgr_create(struct device *dev, const char *name,
+struct fpga_manager *fpga_mgr_create(struct device *parent, const char *name,
 				     const struct fpga_manager_ops *mops,
 				     void *priv)
 {
@@ -571,12 +571,12 @@ struct fpga_manager *fpga_mgr_create(struct device *dev, const char *name,
 	if (!mops || !mops->write_complete || !mops->state ||
 	    !mops->write_init || (!mops->write && !mops->write_sg) ||
 	    (mops->write && mops->write_sg)) {
-		dev_err(dev, "Attempt to register without fpga_manager_ops\n");
+		dev_err(parent, "Attempt to register without fpga_manager_ops\n");
 		return NULL;
 	}
 
 	if (!name || !strlen(name)) {
-		dev_err(dev, "Attempt to register with no name!\n");
+		dev_err(parent, "Attempt to register with no name!\n");
 		return NULL;
 	}
 
@@ -585,8 +585,10 @@ struct fpga_manager *fpga_mgr_create(struct device *dev, const char *name,
 		return NULL;
 
 	id = ida_simple_get(&fpga_mgr_ida, 0, 0, GFP_KERNEL);
-	if (id < 0)
-		goto error_kfree;
+	if (id < 0) {
+		kfree(mgr);
+		return NULL;
+	}
 
 	mutex_init(&mgr->ref_mutex);
 
@@ -597,22 +599,17 @@ struct fpga_manager *fpga_mgr_create(struct device *dev, const char *name,
 	device_initialize(&mgr->dev);
 	mgr->dev.class = fpga_mgr_class;
 	mgr->dev.groups = mops->groups;
-	mgr->dev.parent = dev;
-	mgr->dev.of_node = dev->of_node;
+	mgr->dev.parent = parent;
+	mgr->dev.of_node = parent->of_node;
 	mgr->dev.id = id;
 
 	ret = dev_set_name(&mgr->dev, "fpga%d", id);
-	if (ret)
-		goto error_device;
+	if (ret) {
+		put_device(&mgr->dev);
+		return NULL;
+	}
 
 	return mgr;
-
-error_device:
-	ida_simple_remove(&fpga_mgr_ida, id);
-error_kfree:
-	kfree(mgr);
-
-	return NULL;
 }
 EXPORT_SYMBOL_GPL(fpga_mgr_create);
 
@@ -622,8 +619,7 @@ EXPORT_SYMBOL_GPL(fpga_mgr_create);
  */
 void fpga_mgr_free(struct fpga_manager *mgr)
 {
-	ida_simple_remove(&fpga_mgr_ida, mgr->dev.id);
-	kfree(mgr);
+	put_device(&mgr->dev);
 }
 EXPORT_SYMBOL_GPL(fpga_mgr_free);
 
@@ -631,12 +627,12 @@ static void devm_fpga_mgr_release(struct device *dev, void *res)
 {
 	struct fpga_mgr_devres *dr = res;
 
-	fpga_mgr_free(dr->mgr);
+	put_device(&dr->mgr->dev);
 }
 
 /**
  * devm_fpga_mgr_create - create and initialize a managed FPGA manager struct
- * @dev:	fpga manager device from pdev
+ * @parent:	fpga manager device from pdev
  * @name:	fpga manager name
  * @mops:	pointer to structure of fpga manager ops
  * @priv:	fpga manager private data
@@ -651,7 +647,7 @@ static void devm_fpga_mgr_release(struct device *dev, void *res)
  *
  * Return: pointer to struct fpga_manager or NULL
  */
-struct fpga_manager *devm_fpga_mgr_create(struct device *dev, const char *name,
+struct fpga_manager *devm_fpga_mgr_create(struct device *parent, const char *name,
 					  const struct fpga_manager_ops *mops,
 					  void *priv)
 {
@@ -661,13 +657,13 @@ struct fpga_manager *devm_fpga_mgr_create(struct device *dev, const char *name,
 	if (!dr)
 		return NULL;
 
-	dr->mgr = fpga_mgr_create(dev, name, mops, priv);
+	dr->mgr = fpga_mgr_create(parent, name, mops, priv);
 	if (!dr->mgr) {
 		devres_free(dr);
 		return NULL;
 	}
 
-	devres_add(dev, dr);
+	devres_add(parent, dr);
 
 	return dr->mgr;
 }
@@ -692,16 +688,11 @@ int fpga_mgr_register(struct fpga_manager *mgr)
 
 	ret = device_add(&mgr->dev);
 	if (ret)
-		goto error_device;
+		return ret;
 
 	dev_info(&mgr->dev, "%s registered\n", mgr->name);
 
 	return 0;
-
-error_device:
-	ida_simple_remove(&fpga_mgr_ida, mgr->dev.id);
-
-	return ret;
 }
 EXPORT_SYMBOL_GPL(fpga_mgr_register);
 
@@ -722,7 +713,7 @@ void fpga_mgr_unregister(struct fpga_manager *mgr)
 	if (mgr->mops->fpga_remove)
 		mgr->mops->fpga_remove(mgr);
 
-	device_unregister(&mgr->dev);
+	device_del(&mgr->dev);
 }
 EXPORT_SYMBOL_GPL(fpga_mgr_unregister);
 
@@ -781,6 +772,10 @@ EXPORT_SYMBOL_GPL(devm_fpga_mgr_register);
 
 static void fpga_mgr_dev_release(struct device *dev)
 {
+	struct fpga_manager *mgr = to_fpga_manager(dev);
+
+	ida_simple_remove(&fpga_mgr_ida, mgr->dev.id);
+	kfree(mgr);
 }
 
 static int __init fpga_mgr_class_init(void)
-- 
2.25.1