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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/drivers/fpga/fpga-region.c
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@@ -1,6 +1,6 @@
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 // SPDX-License-Identifier: GPL-2.0
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 /*
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- * FPGA Region - Device Tree support for FPGA programming under Linux
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+ * FPGA Region - Support for FPGA programming under Linux
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  *
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  *  Copyright (C) 2013-2016 Altera Corporation
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  *  Copyright (C) 2017 Intel Corporation
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@@ -185,6 +185,10 @@
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  * @mgr: manager that programs this region
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  * @get_bridges: optional function to get bridges to a list
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  *
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+ * The caller of this function is responsible for freeing the resulting region
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+ * struct with fpga_region_free().  Using devm_fpga_region_create() instead is
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+ * recommended.
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+ *
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  * Return: struct fpga_region or NULL
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  */
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 struct fpga_region
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@@ -230,8 +234,8 @@
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 EXPORT_SYMBOL_GPL(fpga_region_create);
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 /**
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- * fpga_region_free - free a struct fpga_region
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- * @region: FPGA region created by fpga_region_create
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+ * fpga_region_free - free a FPGA region created by fpga_region_create()
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+ * @region: FPGA region
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  */
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 void fpga_region_free(struct fpga_region *region)
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 {
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@@ -240,21 +244,69 @@
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 }
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 EXPORT_SYMBOL_GPL(fpga_region_free);
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+static void devm_fpga_region_release(struct device *dev, void *res)
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+{
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+	struct fpga_region *region = *(struct fpga_region **)res;
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+
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+	fpga_region_free(region);
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+}
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+
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+/**
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+ * devm_fpga_region_create - create and initialize a managed FPGA region struct
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+ * @dev: device parent
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+ * @mgr: manager that programs this region
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+ * @get_bridges: optional function to get bridges to a list
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+ *
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+ * This function is intended for use in a FPGA region driver's probe function.
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+ * After the region driver creates the region struct with
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+ * devm_fpga_region_create(), it should register it with fpga_region_register().
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+ * The region driver's remove function should call fpga_region_unregister().
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+ * The region struct allocated with this function will be freed automatically on
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+ * driver detach.  This includes the case of a probe function returning error
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+ * before calling fpga_region_register(), the struct will still get cleaned up.
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+ *
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+ * Return: struct fpga_region or NULL
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+ */
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+struct fpga_region
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+*devm_fpga_region_create(struct device *dev,
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+			 struct fpga_manager *mgr,
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+			 int (*get_bridges)(struct fpga_region *))
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+{
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+	struct fpga_region **ptr, *region;
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+
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+	ptr = devres_alloc(devm_fpga_region_release, sizeof(*ptr), GFP_KERNEL);
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+	if (!ptr)
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+		return NULL;
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+
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+	region = fpga_region_create(dev, mgr, get_bridges);
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+	if (!region) {
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+		devres_free(ptr);
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+	} else {
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+		*ptr = region;
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+		devres_add(dev, ptr);
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+	}
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+
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+	return region;
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+}
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+EXPORT_SYMBOL_GPL(devm_fpga_region_create);
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+
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 /**
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  * fpga_region_register - register a FPGA region
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- * @region: FPGA region created by fpga_region_create
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+ * @region: FPGA region
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+ *
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  * Return: 0 or -errno
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  */
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 int fpga_region_register(struct fpga_region *region)
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 {
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 	return device_add(&region->dev);
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-
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 }
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 EXPORT_SYMBOL_GPL(fpga_region_register);
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 /**
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- * fpga_region_unregister - unregister and free a FPGA region
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+ * fpga_region_unregister - unregister a FPGA region
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  * @region: FPGA region
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+ *
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+ * This function is intended for use in a FPGA region driver's remove function.
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  */
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 void fpga_region_unregister(struct fpga_region *region)
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 {
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@@ -264,9 +316,6 @@
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 static void fpga_region_dev_release(struct device *dev)
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 {
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-	struct fpga_region *region = to_fpga_region(dev);
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-
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-	fpga_region_free(region);
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 }
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 /**