[PATCH v5 02/17] nvmem: add DEFINE_FREE for nvmem_cell_put cleanup

[Varshini Rajendran <varshini.rajendran@microchip.com>]

Add cleanup.h helper for nvmem_cell_put() to enable automatic resource
cleanup using __free(nvmem_cell_put) annotation.

Use IS_ERR_OR_NULL() since nvmem_cell_get() can return error pointers,
and passing an ERR_PTR to nvmem_cell_put() would cause issues.

Signed-off-by: Varshini Rajendran <varshini.rajendran@microchip.com>
---
 include/linux/nvmem-consumer.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/linux/nvmem-consumer.h b/include/linux/nvmem-consumer.h
index 34c0e58dfa26..35a2ea8b8957 100644
--- a/include/linux/nvmem-consumer.h
+++ b/include/linux/nvmem-consumer.h
@@ -9,6 +9,7 @@
 #ifndef _LINUX_NVMEM_CONSUMER_H
 #define _LINUX_NVMEM_CONSUMER_H
 
+#include <linux/cleanup.h>
 #include <linux/err.h>
 #include <linux/errno.h>
 #include <linux/notifier.h>
@@ -54,6 +55,9 @@ struct nvmem_cell *nvmem_cell_get(struct device *dev, const char *id);
 struct nvmem_cell *devm_nvmem_cell_get(struct device *dev, const char *id);
 void nvmem_cell_put(struct nvmem_cell *cell);
 void devm_nvmem_cell_put(struct device *dev, struct nvmem_cell *cell);
+
+DEFINE_FREE(nvmem_cell_put, struct nvmem_cell *, if (!IS_ERR_OR_NULL(_T)) nvmem_cell_put(_T))
+
 void *nvmem_cell_read(struct nvmem_cell *cell, size_t *len);
 int nvmem_cell_write(struct nvmem_cell *cell, void *buf, size_t len);
 int nvmem_cell_read_u8(struct device *dev, const char *cell_id, u8 *val);
-- 
2.34.1