From 0d70af3c2530a70f1b2c197feaa63fbd3548ce34 Mon Sep 17 00:00:00 2001
From: Russ Weight <russell.h.weight@intel.com>
Date: Thu, 18 Nov 2021 17:55:52 -0800
Subject: [PATCH] fpga: bridge: Use standard dev_release for class driver
Git-commit: 0d70af3c2530a70f1b2c197feaa63fbd3548ce34
Patch-mainline: v5.17-rc1
References: jsc#PED-1263
The FPGA bridge class driver data structure is being treated as a
managed resource instead of using the standard dev_release call-back
function 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>
Reviewed-by: Xu Yilun <yilun.xu@intel.com>
Acked-by: Xu Yilun <yilun.xu@intel.com>
Signed-off-by: Moritz Fischer <mdf@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
Documentation/driver-api/fpga/fpga-bridge.rst | 6 -
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 | 122 +++++---------------------
drivers/fpga/xilinx-pr-decoupler.c | 17 +--
include/linux/fpga/fpga-bridge.h | 30 ++++--
8 files changed, 74 insertions(+), 145 deletions(-)
--- a/Documentation/driver-api/fpga/fpga-bridge.rst
+++ b/Documentation/driver-api/fpga/fpga-bridge.rst
@@ -6,8 +6,7 @@ API to implement a new FPGA bridge
* struct fpga_bridge - The FPGA Bridge structure
* struct fpga_bridge_ops - Low level Bridge driver ops
-* devm_fpga_bridge_create() - Allocate and init a bridge struct
-* fpga_bridge_register() - Register a bridge
+* fpga_bridge_register() - Create and register a bridge
* fpga_bridge_unregister() - Unregister a bridge
.. kernel-doc:: include/linux/fpga/fpga-bridge.h
@@ -17,9 +16,6 @@ API to implement a new FPGA bridge
:functions: fpga_bridge_ops
.. kernel-doc:: drivers/fpga/fpga-bridge.c
- :functions: devm_fpga_bridge_create
-
-.. kernel-doc:: drivers/fpga/fpga-bridge.c
:functions: fpga_bridge_register
.. kernel-doc:: drivers/fpga/fpga-bridge.c
--- a/drivers/fpga/altera-fpga2sdram.c
+++ b/drivers/fpga/altera-fpga2sdram.c
@@ -121,17 +121,13 @@ static int alt_fpga_bridge_probe(struct
/* 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(br);
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)) {
--- a/drivers/fpga/altera-freeze-bridge.c
+++ b/drivers/fpga/altera-freeze-bridge.c
@@ -246,14 +246,14 @@ static int altera_freeze_br_probe(struct
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)
--- a/drivers/fpga/altera-hps2fpga.c
+++ b/drivers/fpga/altera-hps2fpga.c
@@ -180,19 +180,15 @@ static int alt_fpga_bridge_probe(struct
}
}
- 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:
--- 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_
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)
--- a/drivers/fpga/fpga-bridge.c
+++ b/drivers/fpga/fpga-bridge.c
@@ -312,36 +312,41 @@ static struct attribute *fpga_bridge_att
ATTRIBUTE_GROUPS(fpga_bridge);
/**
- * fpga_bridge_create - create and initialize a struct fpga_bridge
+ * fpga_bridge_register - create and register an 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 (!br_ops) {
+ dev_err(parent, "Attempt to register without fpga_bridge_ops\n");
+ return ERR_PTR(-EINVAL);
+ }
+
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 +355,23 @@ struct fpga_bridge *fpga_bridge_create(s
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 +379,7 @@ error_device:
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 +405,10 @@ 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)
--- a/drivers/fpga/xilinx-pr-decoupler.c
+++ b/drivers/fpga/xilinx-pr-decoupler.c
@@ -140,22 +140,17 @@ static int xlnx_pr_decoupler_probe(struc
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:
--- a/include/linux/fpga/fpga-bridge.h
+++ b/include/linux/fpga/fpga-bridge.h
@@ -25,6 +25,23 @@ struct fpga_bridge_ops {
};
/**
+ * struct fpga_bridge_info - collection of parameters an FPGA Bridge
+ * @name: fpga bridge name
+ * @br_ops: pointer to structure of fpga bridge ops
+ * @priv: fpga bridge private data
+ *
+ * fpga_bridge_info contains parameters for the register function. These
+ * are separated into an info structure because they some are optional
+ * others could be added to in the future. The info structure facilitates
+ * maintaining a stable API.
+ */
+struct fpga_bridge_info {
+ const char *name;
+ const struct fpga_bridge_ops *br_ops;
+ void *priv;
+};
+
+/**
* struct fpga_bridge - FPGA bridge structure
* @name: name of low level FPGA bridge
* @dev: FPGA bridge device
@@ -66,15 +83,10 @@ int of_fpga_bridge_get_to_list(struct de
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 *parent, 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 */