linux-kernel - [PATCH] drivers: mhi: make mhi_ep_bus

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Message-ID: <20250919074408.868220-1-abarnas@google.com>
Date: Fri, 19 Sep 2025 07:44:08 +0000
From: "Adrian Barnaś" <abarnas@...gle.com>
To: Manivannan Sadhasivam <mani@...nel.org>, mhi@...ts.linux.dev, linux-arm-msm@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Cc: Akhil Vinod <akhil.vinod@....qualcomm.com>, 
	Sumit Kumar <sumit.kumar@....qualcomm.com>, 
	Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
	"Adrian Barnaś" <abarnas@...gle.com>
Subject: [PATCH] drivers: mhi: make mhi_ep_bus_type const

Because driver core can properly handle constant struct bus_type,
move the mhi_ep_bus_type to be a constant structure as well, placing it
into read-only memory which can not be modified at runtime.

Signed-off-by: Adrian Barnaś <abarnas@...gle.com>
---
 drivers/bus/mhi/ep/internal.h | 2 +-
 drivers/bus/mhi/ep/main.c     | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/bus/mhi/ep/internal.h b/drivers/bus/mhi/ep/internal.h
index 577965f95fda..512da7482acc 100644
--- a/drivers/bus/mhi/ep/internal.h
+++ b/drivers/bus/mhi/ep/internal.h
@@ -11,7 +11,7 @@
 
 #include "../common.h"
 
-extern struct bus_type mhi_ep_bus_type;
+extern const struct bus_type mhi_ep_bus_type;
 
 #define MHI_REG_OFFSET				0x100
 #define BHI_REG_OFFSET				0x200
diff --git a/drivers/bus/mhi/ep/main.c b/drivers/bus/mhi/ep/main.c
index cdea24e92919..86e003bc44e0 100644
--- a/drivers/bus/mhi/ep/main.c
+++ b/drivers/bus/mhi/ep/main.c
@@ -1703,7 +1703,7 @@ static int mhi_ep_match(struct device *dev, const struct device_driver *drv)
 	return 0;
 };
 
-struct bus_type mhi_ep_bus_type = {
+const struct bus_type mhi_ep_bus_type = {
 	.name = "mhi_ep",
 	.dev_name = "mhi_ep",
 	.match = mhi_ep_match,
-- 
2.51.0.534.gc79095c0ca-goog