linux-kernel - [PATCH 01/11] nvmem: layouts: store owner from modules with nvmem_layout_driver

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Date: Tue, 30 Apr 2024 09:49:11 +0100
From: srinivas.kandagatla@...aro.org
To: gregkh@...uxfoundation.org
Cc: linux-kernel@...r.kernel.org,
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
	Michael Walle <mwalle@...nel.org>,
	Miquel Raynal <miquel.raynal@...tlin.com>,
	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: [PATCH 01/11] nvmem: layouts: store owner from modules with nvmem_layout_driver_register()

From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>

Modules registering driver with nvmem_layout_driver_register() might
forget to set .owner field.  The field is used by some of other kernel
parts for reference counting (try_module_get()), so it is expected that
drivers will set it.

Solve the problem by moving this task away from the drivers to the core
code, just like we did for platform_driver in
commit 9447057eaff8 ("platform_device: use a macro instead of
platform_driver_register").

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Reviewed-by: Michael Walle <mwalle@...nel.org>
Reviewed-by: Miquel Raynal <miquel.raynal@...tlin.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
---
 drivers/nvmem/layouts.c        | 6 ++++--
 include/linux/nvmem-provider.h | 5 ++++-
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/nvmem/layouts.c b/drivers/nvmem/layouts.c
index 8b5e2de138eb..64dc7013a098 100644
--- a/drivers/nvmem/layouts.c
+++ b/drivers/nvmem/layouts.c
@@ -52,13 +52,15 @@ static const struct bus_type nvmem_layout_bus_type = {
 	.remove		= nvmem_layout_bus_remove,
 };
 
-int nvmem_layout_driver_register(struct nvmem_layout_driver *drv)
+int __nvmem_layout_driver_register(struct nvmem_layout_driver *drv,
+				   struct module *owner)
 {
 	drv->driver.bus = &nvmem_layout_bus_type;
+	drv->driver.owner = owner;
 
 	return driver_register(&drv->driver);
 }
-EXPORT_SYMBOL_GPL(nvmem_layout_driver_register);
+EXPORT_SYMBOL_GPL(__nvmem_layout_driver_register);
 
 void nvmem_layout_driver_unregister(struct nvmem_layout_driver *drv)
 {
diff --git a/include/linux/nvmem-provider.h b/include/linux/nvmem-provider.h
index f0ba0e03218f..3ebeaa0ded00 100644
--- a/include/linux/nvmem-provider.h
+++ b/include/linux/nvmem-provider.h
@@ -199,7 +199,10 @@ int nvmem_add_one_cell(struct nvmem_device *nvmem,
 int nvmem_layout_register(struct nvmem_layout *layout);
 void nvmem_layout_unregister(struct nvmem_layout *layout);
 
-int nvmem_layout_driver_register(struct nvmem_layout_driver *drv);
+#define nvmem_layout_driver_register(drv) \
+	__nvmem_layout_driver_register(drv, THIS_MODULE)
+int __nvmem_layout_driver_register(struct nvmem_layout_driver *drv,
+				   struct module *owner);
 void nvmem_layout_driver_unregister(struct nvmem_layout_driver *drv);
 #define module_nvmem_layout_driver(__nvmem_layout_driver)		\
 	module_driver(__nvmem_layout_driver, nvmem_layout_driver_register, \
-- 
2.25.1