[PATCH 1/4] iommu: constify pointer to bus_type

[Krzysztof Kozlowski]

Make pointer to bus_type a pointer to const for code safety.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>
---
 drivers/iommu/iommu-priv.h | 5 +++--
 drivers/iommu/iommu.c      | 5 +++--
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/iommu/iommu-priv.h b/drivers/iommu/iommu-priv.h
index 2024a2313348..5f731d994803 100644
--- a/drivers/iommu/iommu-priv.h
+++ b/drivers/iommu/iommu-priv.h
@@ -21,10 +21,11 @@ int iommu_group_replace_domain(struct iommu_group *group,
 			       struct iommu_domain *new_domain);
 
 int iommu_device_register_bus(struct iommu_device *iommu,
-			      const struct iommu_ops *ops, struct bus_type *bus,
+			      const struct iommu_ops *ops,
+			      const struct bus_type *bus,
 			      struct notifier_block *nb);
 void iommu_device_unregister_bus(struct iommu_device *iommu,
-				 struct bus_type *bus,
+				 const struct bus_type *bus,
 				 struct notifier_block *nb);
 
 #endif /* __LINUX_IOMMU_PRIV_H */
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index d14413916f93..170329a085b8 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -291,7 +291,7 @@ EXPORT_SYMBOL_GPL(iommu_device_unregister);
 
 #if IS_ENABLED(CONFIG_IOMMUFD_TEST)
 void iommu_device_unregister_bus(struct iommu_device *iommu,
-				 struct bus_type *bus,
+				 const struct bus_type *bus,
 				 struct notifier_block *nb)
 {
 	bus_unregister_notifier(bus, nb);
@@ -305,7 +305,8 @@ EXPORT_SYMBOL_GPL(iommu_device_unregister_bus);
  * some memory to hold a notifier_block.
  */
 int iommu_device_register_bus(struct iommu_device *iommu,
-			      const struct iommu_ops *ops, struct bus_type *bus,
+			      const struct iommu_ops *ops,
+			      const struct bus_type *bus,
 			      struct notifier_block *nb)
 {
 	int err;
-- 
2.34.1