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Subject[PATCH v5 1/2] devres: Provide new helper for devm functions
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Provide a simple wrapper for devres_alloc / devres_add.

Signed-off-by: Marc Gonzalez <marc.w.gonzalez@free.fr>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
drivers/base/devres.c | 28 ++++++++++++++++++++++++++++
include/linux/device.h | 3 +++
2 files changed, 31 insertions(+)

diff --git a/drivers/base/devres.c b/drivers/base/devres.c
index 0bbb328bd17f..b4c18c105f39 100644
--- a/drivers/base/devres.c
+++ b/drivers/base/devres.c
@@ -685,6 +685,34 @@ int devres_release_group(struct device *dev, void *id)
}
EXPORT_SYMBOL_GPL(devres_release_group);

+/**
+ * devm_add - allocate and register new device resource
+ * @dev: device to add resource to
+ * @func: resource release function
+ * @arg: resource data
+ * @size: resource data size
+ *
+ * Simple wrapper for devres_alloc / devres_add.
+ * Releases the resource if the allocation failed.
+ *
+ * RETURNS:
+ * 0 on success, -ENOMEM otherwise.
+ */
+int devm_add(struct device *dev, dr_release_t func, void *arg, size_t size)
+{
+ void *data = devres_alloc(func, size, GFP_KERNEL);
+
+ if (!data) {
+ func(dev, arg);
+ return -ENOMEM;
+ }
+
+ memcpy(data, arg, size);
+ devres_add(dev, data);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(devm_add);
+
/*
* Custom devres actions allow inserting a simple function call
* into the teadown sequence.
diff --git a/include/linux/device.h b/include/linux/device.h
index 0cd7c647c16c..55be3be9b276 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -247,6 +247,9 @@ void __iomem *devm_of_iomap(struct device *dev,
struct device_node *node, int index,
resource_size_t *size);

+int devm_add(struct device *dev, dr_release_t func, void *arg, size_t size);
+#define devm_vadd(dev, func, type, args...) \
+ devm_add(dev, func, &(struct type){args}, sizeof(struct type))
/* allows to add/remove a custom action to devres stack */
int devm_add_action(struct device *dev, void (*action)(void *), void *data);
void devm_remove_action(struct device *dev, void (*action)(void *), void *data);
--
2.17.1
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