[PATCH 08/14] nvmem: core: validate nvmem config before parsing

[Srinivas Kandagatla]

nvmem provider has to provide either reg_read/write, add a check
to enforce this.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>
---
 drivers/nvmem/core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index c05c4f4a7b9e..77d890d3623d 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -339,6 +339,9 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config)
 	if (!config->dev)
 		return ERR_PTR(-EINVAL);
 
+	if (!config->reg_read && !config->reg_write)
+		return ERR_PTR(-EINVAL);
+
 	nvmem = kzalloc(sizeof(*nvmem), GFP_KERNEL);
 	if (!nvmem)
 		return ERR_PTR(-ENOMEM);
-- 
2.21.0