[PATCH v5 2/3] fpga: bridge: Use standard dev_release for class driver

[Russ Weight <russell.h.weight@intel.com>]

The FPGA bridge class driver data structure is being treated as a
managed resource instead of using standard dev_release call-back
to release the class data structure. This change removes the
managed resource code and combines the create() and register()
functions into a single register() function.

Signed-off-by: Russ Weight <russell.h.weight@intel.com>
---
v5:
  - Rebased on top of recently accepted patches.
v4:
  - Restore the previous format for the Return value in the comment header
    for fpga_bridge_register()
v3:
  - Cleaned up comment header for fpga_bridge_register()
  - Fix error return values for fpga_bridge_register()
v2:
  - No changes
---
 drivers/fpga/altera-fpga2sdram.c    |  12 +--
 drivers/fpga/altera-freeze-bridge.c |  10 +--
 drivers/fpga/altera-hps2fpga.c      |  12 +--
 drivers/fpga/dfl-fme-br.c           |  10 +--
 drivers/fpga/fpga-bridge.c          | 116 ++++++----------------------
 drivers/fpga/xilinx-pr-decoupler.c  |  17 ++--
 include/linux/fpga/fpga-bridge.h    |  12 +--
 7 files changed, 49 insertions(+), 140 deletions(-)

diff --git a/drivers/fpga/altera-fpga2sdram.c b/drivers/fpga/altera-fpga2sdram.c
index a78e49c63c64..66063507116b 100644
--- a/drivers/fpga/altera-fpga2sdram.c
+++ b/drivers/fpga/altera-fpga2sdram.c
@@ -121,17 +121,13 @@ static int alt_fpga_bridge_probe(struct platform_device *pdev)
 	/* Get f2s bridge configuration saved in handoff register */
 	regmap_read(sysmgr, SYSMGR_ISWGRP_HANDOFF3, &priv->mask);
 
-	br = devm_fpga_bridge_create(dev, F2S_BRIDGE_NAME,
-				     &altera_fpga2sdram_br_ops, priv);
-	if (!br)
-		return -ENOMEM;
+	br = fpga_bridge_register(dev, F2S_BRIDGE_NAME,
+				  &altera_fpga2sdram_br_ops, priv);
+	if (IS_ERR(br))
+		return PTR_ERR(mgr);
 
 	platform_set_drvdata(pdev, br);
 
-	ret = fpga_bridge_register(br);
-	if (ret)
-		return ret;
-
 	dev_info(dev, "driver initialized with handoff %08x\n", priv->mask);
 
 	if (!of_property_read_u32(dev->of_node, "bridge-enable", &enable)) {
diff --git a/drivers/fpga/altera-freeze-bridge.c b/drivers/fpga/altera-freeze-bridge.c
index dd58c4aea92e..bfbfa43cd05b 100644
--- a/drivers/fpga/altera-freeze-bridge.c
+++ b/drivers/fpga/altera-freeze-bridge.c
@@ -244,14 +244,14 @@ static int altera_freeze_br_probe(struct platform_device *pdev)
 
 	priv->base_addr = base_addr;
 
-	br = devm_fpga_bridge_create(dev, FREEZE_BRIDGE_NAME,
-				     &altera_freeze_br_br_ops, priv);
-	if (!br)
-		return -ENOMEM;
+	br = fpga_bridge_register(dev, FREEZE_BRIDGE_NAME,
+				  &altera_freeze_br_br_ops, priv);
+	if (IS_ERR(br))
+		return PTR_ERR(br);
 
 	platform_set_drvdata(pdev, br);
 
-	return fpga_bridge_register(br);
+	return 0;
 }
 
 static int altera_freeze_br_remove(struct platform_device *pdev)
diff --git a/drivers/fpga/altera-hps2fpga.c b/drivers/fpga/altera-hps2fpga.c
index 77b95f251821..aa758426c22b 100644
--- a/drivers/fpga/altera-hps2fpga.c
+++ b/drivers/fpga/altera-hps2fpga.c
@@ -180,19 +180,15 @@ static int alt_fpga_bridge_probe(struct platform_device *pdev)
 		}
 	}
 
-	br = devm_fpga_bridge_create(dev, priv->name,
-				     &altera_hps2fpga_br_ops, priv);
-	if (!br) {
-		ret = -ENOMEM;
+	br = fpga_bridge_register(dev, priv->name,
+				  &altera_hps2fpga_br_ops, priv);
+	if (IS_ERR(br)) {
+		ret = PTR_ERR(br);
 		goto err;
 	}
 
 	platform_set_drvdata(pdev, br);
 
-	ret = fpga_bridge_register(br);
-	if (ret)
-		goto err;
-
 	return 0;
 
 err:
diff --git a/drivers/fpga/dfl-fme-br.c b/drivers/fpga/dfl-fme-br.c
index 3ff9f3a687ce..808d1f4d76df 100644
--- a/drivers/fpga/dfl-fme-br.c
+++ b/drivers/fpga/dfl-fme-br.c
@@ -68,14 +68,14 @@ static int fme_br_probe(struct platform_device *pdev)
 
 	priv->pdata = dev_get_platdata(dev);
 
-	br = devm_fpga_bridge_create(dev, "DFL FPGA FME Bridge",
-				     &fme_bridge_ops, priv);
-	if (!br)
-		return -ENOMEM;
+	br = fpga_bridge_register(dev, "DFL FPGA FME Bridge",
+				  &fme_bridge_ops, priv);
+	if (IS_ERR(br))
+		return PTR_ERR(br);
 
 	platform_set_drvdata(pdev, br);
 
-	return fpga_bridge_register(br);
+	return 0;
 }
 
 static int fme_br_remove(struct platform_device *pdev)
diff --git a/drivers/fpga/fpga-bridge.c b/drivers/fpga/fpga-bridge.c
index 798f55670646..15be378b64ab 100644
--- a/drivers/fpga/fpga-bridge.c
+++ b/drivers/fpga/fpga-bridge.c
@@ -312,36 +312,35 @@ static struct attribute *fpga_bridge_attrs[] = {
 ATTRIBUTE_GROUPS(fpga_bridge);
 
 /**
- * fpga_bridge_create - create and initialize a struct fpga_bridge
+ * fpga_bridge_register - create and register a FPGA Bridge device
  * @parent:	FPGA bridge device from pdev
  * @name:	FPGA bridge name
  * @br_ops:	pointer to structure of fpga bridge ops
  * @priv:	FPGA bridge private data
  *
- * The caller of this function is responsible for freeing the bridge with
- * fpga_bridge_free().  Using devm_fpga_bridge_create() instead is recommended.
- *
- * Return: struct fpga_bridge or NULL
+ * Return: struct fpga_bridge pointer or ERR_PTR()
  */
-struct fpga_bridge *fpga_bridge_create(struct device *parent, const char *name,
-				       const struct fpga_bridge_ops *br_ops,
-				       void *priv)
+struct fpga_bridge *fpga_bridge_register(struct device *parent, const char *name,
+					 const struct fpga_bridge_ops *br_ops,
+					 void *priv)
 {
 	struct fpga_bridge *bridge;
 	int id, ret;
 
 	if (!name || !strlen(name)) {
 		dev_err(parent, "Attempt to register with no name!\n");
-		return NULL;
+		return ERR_PTR(-EINVAL);
 	}
 
 	bridge = kzalloc(sizeof(*bridge), GFP_KERNEL);
 	if (!bridge)
-		return NULL;
+		return ERR_PTR(-ENOMEM);
 
 	id = ida_simple_get(&fpga_bridge_ida, 0, 0, GFP_KERNEL);
-	if (id < 0)
+	if (id < 0) {
+		ret = id;
 		goto error_kfree;
+	}
 
 	mutex_init(&bridge->mutex);
 	INIT_LIST_HEAD(&bridge->node);
@@ -350,17 +349,23 @@ struct fpga_bridge *fpga_bridge_create(struct device *parent, const char *name,
 	bridge->br_ops = br_ops;
 	bridge->priv = priv;
 
-	device_initialize(&bridge->dev);
 	bridge->dev.groups = br_ops->groups;
 	bridge->dev.class = fpga_bridge_class;
 	bridge->dev.parent = parent;
 	bridge->dev.of_node = parent->of_node;
 	bridge->dev.id = id;
+	of_platform_populate(bridge->dev.of_node, NULL, NULL, &bridge->dev);
 
 	ret = dev_set_name(&bridge->dev, "br%d", id);
 	if (ret)
 		goto error_device;
 
+	ret = device_register(&bridge->dev);
+	if (ret) {
+		put_device(&bridge->dev);
+		return ERR_PTR(ret);
+	}
+
 	return bridge;
 
 error_device:
@@ -368,88 +373,7 @@ struct fpga_bridge *fpga_bridge_create(struct device *parent, const char *name,
 error_kfree:
 	kfree(bridge);
 
-	return NULL;
-}
-EXPORT_SYMBOL_GPL(fpga_bridge_create);
-
-/**
- * fpga_bridge_free - free an fpga bridge created by fpga_bridge_create()
- * @bridge:	FPGA bridge struct
- */
-void fpga_bridge_free(struct fpga_bridge *bridge)
-{
-	ida_simple_remove(&fpga_bridge_ida, bridge->dev.id);
-	kfree(bridge);
-}
-EXPORT_SYMBOL_GPL(fpga_bridge_free);
-
-static void devm_fpga_bridge_release(struct device *dev, void *res)
-{
-	struct fpga_bridge *bridge = *(struct fpga_bridge **)res;
-
-	fpga_bridge_free(bridge);
-}
-
-/**
- * devm_fpga_bridge_create - create and init a managed struct fpga_bridge
- * @parent:	FPGA bridge device from pdev
- * @name:	FPGA bridge name
- * @br_ops:	pointer to structure of fpga bridge ops
- * @priv:	FPGA bridge private data
- *
- * This function is intended for use in an FPGA bridge driver's probe function.
- * After the bridge driver creates the struct with devm_fpga_bridge_create(), it
- * should register the bridge with fpga_bridge_register().  The bridge driver's
- * remove function should call fpga_bridge_unregister().  The bridge struct
- * allocated with this function will be freed automatically on driver detach.
- * This includes the case of a probe function returning error before calling
- * fpga_bridge_register(), the struct will still get cleaned up.
- *
- *  Return: struct fpga_bridge or NULL
- */
-struct fpga_bridge
-*devm_fpga_bridge_create(struct device *parent, const char *name,
-			 const struct fpga_bridge_ops *br_ops, void *priv)
-{
-	struct fpga_bridge **ptr, *bridge;
-
-	ptr = devres_alloc(devm_fpga_bridge_release, sizeof(*ptr), GFP_KERNEL);
-	if (!ptr)
-		return NULL;
-
-	bridge = fpga_bridge_create(parent, name, br_ops, priv);
-	if (!bridge) {
-		devres_free(ptr);
-	} else {
-		*ptr = bridge;
-		devres_add(parent, ptr);
-	}
-
-	return bridge;
-}
-EXPORT_SYMBOL_GPL(devm_fpga_bridge_create);
-
-/**
- * fpga_bridge_register - register an FPGA bridge
- *
- * @bridge: FPGA bridge struct
- *
- * Return: 0 for success, error code otherwise.
- */
-int fpga_bridge_register(struct fpga_bridge *bridge)
-{
-	struct device *dev = &bridge->dev;
-	int ret;
-
-	ret = device_add(dev);
-	if (ret)
-		return ret;
-
-	of_platform_populate(dev->of_node, NULL, NULL, dev);
-
-	dev_info(dev->parent, "fpga bridge [%s] registered\n", bridge->name);
-
-	return 0;
+	return ERR_PTR(ret);
 }
 EXPORT_SYMBOL_GPL(fpga_bridge_register);
 
@@ -475,6 +399,10 @@ EXPORT_SYMBOL_GPL(fpga_bridge_unregister);
 
 static void fpga_bridge_dev_release(struct device *dev)
 {
+	struct fpga_bridge *bridge = to_fpga_bridge(dev);
+
+	ida_simple_remove(&fpga_bridge_ida, bridge->dev.id);
+	kfree(bridge);
 }
 
 static int __init fpga_bridge_dev_init(void)
diff --git a/drivers/fpga/xilinx-pr-decoupler.c b/drivers/fpga/xilinx-pr-decoupler.c
index ea2bde6e5bc4..c004e52b9464 100644
--- a/drivers/fpga/xilinx-pr-decoupler.c
+++ b/drivers/fpga/xilinx-pr-decoupler.c
@@ -138,22 +138,17 @@ static int xlnx_pr_decoupler_probe(struct platform_device *pdev)
 
 	clk_disable(priv->clk);
 
-	br = devm_fpga_bridge_create(&pdev->dev, priv->ipconfig->name,
-				     &xlnx_pr_decoupler_br_ops, priv);
-	if (!br) {
-		err = -ENOMEM;
-		goto err_clk;
-	}
-
-	platform_set_drvdata(pdev, br);
-
-	err = fpga_bridge_register(br);
-	if (err) {
+	br = fpga_bridge_register(&pdev->dev, priv->ipconfig->name,
+				  &xlnx_pr_decoupler_br_ops, priv);
+	if (IS_ERR(br)) {
+		err = PTR_ERR(br);
 		dev_err(&pdev->dev, "unable to register %s",
 			priv->ipconfig->name);
 		goto err_clk;
 	}
 
+	platform_set_drvdata(pdev, br);
+
 	return 0;
 
 err_clk:
diff --git a/include/linux/fpga/fpga-bridge.h b/include/linux/fpga/fpga-bridge.h
index 6c3c28806ff1..2f0eb62c49f5 100644
--- a/include/linux/fpga/fpga-bridge.h
+++ b/include/linux/fpga/fpga-bridge.h
@@ -62,15 +62,9 @@ int of_fpga_bridge_get_to_list(struct device_node *np,
 			       struct fpga_image_info *info,
 			       struct list_head *bridge_list);
 
-struct fpga_bridge *fpga_bridge_create(struct device *dev, const char *name,
-				       const struct fpga_bridge_ops *br_ops,
-				       void *priv);
-void fpga_bridge_free(struct fpga_bridge *br);
-int fpga_bridge_register(struct fpga_bridge *br);
+struct fpga_bridge *fpga_bridge_register(struct device *dev, const char *name,
+					 const struct fpga_bridge_ops *br_ops,
+					 void *priv);
 void fpga_bridge_unregister(struct fpga_bridge *br);
 
-struct fpga_bridge
-*devm_fpga_bridge_create(struct device *dev, const char *name,
-			 const struct fpga_bridge_ops *br_ops, void *priv);
-
 #endif /* _LINUX_FPGA_BRIDGE_H */
-- 
2.25.1