[PATCH v6 02/17] nvmem: add DEFINE_FREE for nvmem_cell_put cleanup

[Varshini Rajendran]

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 at microchip.com>
---
 include/linux/nvmem-consumer.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/linux/nvmem-consumer.h b/include/linux/nvmem-consumer.h
index 34c0e58dfa26..5315bd862f5f 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>
@@ -243,6 +244,8 @@ static inline struct nvmem_device *nvmem_device_find(void *data,
 
 #endif /* CONFIG_NVMEM */
 
+DEFINE_FREE(nvmem_cell_put, struct nvmem_cell *, if (!IS_ERR_OR_NULL(_T)) nvmem_cell_put(_T))
+
 #if IS_ENABLED(CONFIG_NVMEM) && IS_ENABLED(CONFIG_OF)
 struct nvmem_cell *of_nvmem_cell_get(struct device_node *np,
 				     const char *id);
-- 
2.34.1