814-v6.6-0015-nvmem-core-Return-NULL-when-no-nvmem-layout-is-found.patch

From 6c7f48ea2e663b679aa8e60d8d8e1e6306a644f9 Mon Sep 17 00:00:00 2001
From: Miquel Raynal <miquel.raynal@bootlin.com>
Date: Tue, 8 Aug 2023 08:29:27 +0200
Subject: [PATCH] nvmem: core: Return NULL when no nvmem layout is found

Currently, of_nvmem_layout_get_container() returns NULL on error, or an
error pointer if either CONFIG_NVMEM or CONFIG_OF is turned off. We
should likely avoid this kind of mix for two reasons: to clarify the
intend and anyway fix the !CONFIG_OF which will likely always if we use
this helper somewhere else. Let's just return NULL when no layout is
found, we don't need an error value here.

Link: https://staticthinking.wordpress.com/2022/08/01/mixing-error-pointers-and-null/
Fixes: 266570f496b9 ("nvmem: core: introduce NVMEM layouts")
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/r/202308030002.DnSFOrMB-lkp@intel.com/
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Michael Walle <michael@walle.cc>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
---
 include/linux/nvmem-consumer.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/include/linux/nvmem-consumer.h
+++ b/include/linux/nvmem-consumer.h
@@ -256,7 +256,7 @@ static inline struct nvmem_device *of_nv
 static inline struct device_node *
 of_nvmem_layout_get_container(struct nvmem_device *nvmem)
 {
-	return ERR_PTR(-EOPNOTSUPP);
+	return NULL;
 }
 #endif /* CONFIG_NVMEM && CONFIG_OF */