linux-kernel - [PATCH 1/4] iommu: constify pointer to bus

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Date: Fri, 16 Feb 2024 15:40:24 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Hector Martin <marcan@...can.st>,
	Sven Peter <sven@...npeter.dev>,
	Alyssa Rosenzweig <alyssa@...enzweig.io>,
	Joerg Roedel <joro@...tes.org>,
	Will Deacon <will@...nel.org>,
	Robin Murphy <robin.murphy@....com>,
	Rob Clark <robdclark@...il.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
	Alim Akhtar <alim.akhtar@...sung.com>,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	Yong Wu <yong.wu@...iatek.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Heiko Stuebner <heiko@...ech.de>,
	Orson Zhai <orsonzhai@...il.com>,
	Baolin Wang <baolin.wang@...ux.alibaba.com>,
	Chunyan Zhang <zhang.lyra@...il.com>,
	Chen-Yu Tsai <wens@...e.org>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Samuel Holland <samuel@...lland.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Krishna Reddy <vdumpa@...dia.com>,
	Jonathan Hunter <jonathanh@...dia.com>,
	Jean-Philippe Brucker <jean-philippe@...aro.org>,
	asahi@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org,
	linux-mediatek@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org,
	linux-sunxi@...ts.linux.dev,
	linux-tegra@...r.kernel.org,
	virtualization@...ts.linux.dev
Subject: [PATCH 1/4] iommu: constify pointer to bus_type

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

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
---
 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