linux-kernel - [PATCH] bus: mhi: ep: make mhi_ep_bus

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Message-Id: <20240208-bus_cleanup-mhi-v1-1-ee80f4e71845@marliere.net>
Date: Thu, 08 Feb 2024 16:12:02 -0300
From: "Ricardo B. Marliere" <ricardo@...liere.net>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc: mhi@...ts.linux.dev, linux-arm-msm@...r.kernel.org, 
 linux-kernel@...r.kernel.org, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 "Ricardo B. Marliere" <ricardo@...liere.net>
Subject: [PATCH] bus: mhi: ep: make mhi_ep_bus_type const

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

Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Suggested-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Ricardo B. Marliere <ricardo@...liere.net>
---
 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 8d7a4102bdb7..a583038131d3 100644
--- a/drivers/bus/mhi/ep/main.c
+++ b/drivers/bus/mhi/ep/main.c
@@ -1716,7 +1716,7 @@ static int mhi_ep_match(struct device *dev, 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,

---
base-commit: ceeb64f41fe6a1eb9fc56d583983a81f8f3dd058
change-id: 20240208-bus_cleanup-mhi-cff3d8395b88

Best regards,
-- 
Ricardo B. Marliere <ricardo@...liere.net>