linux-kernel - [PATCH] tee: make tee_bus

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Message-Id: <20240213-bus_cleanup-tee-v1-1-77945ae1a172@marliere.net>
Date: Tue, 13 Feb 2024 11:46:25 -0300
From: "Ricardo B. Marliere" <ricardo@...liere.net>
To: Jens Wiklander <jens.wiklander@...aro.org>, 
 Sumit Garg <sumit.garg@...aro.org>
Cc: op-tee@...ts.trustedfirmware.org, linux-kernel@...r.kernel.org, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 "Ricardo B. Marliere" <ricardo@...liere.net>
Subject: [PATCH] tee: make tee_bus_type const

Since commit d492cc2573a0 ("driver core: device.h: make struct
bus_type a const *"), the driver core can properly handle constant
struct bus_type, move the tee_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/tee/tee_core.c  | 2 +-
 include/linux/tee_drv.h | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/tee/tee_core.c b/drivers/tee/tee_core.c
index 792d6fae4354..e59c20d74b36 100644
--- a/drivers/tee/tee_core.c
+++ b/drivers/tee/tee_core.c
@@ -1226,7 +1226,7 @@ static int tee_client_device_uevent(const struct device *dev,
 	return add_uevent_var(env, "MODALIAS=tee:%pUb", dev_id);
 }

-struct bus_type tee_bus_type = {
+const struct bus_type tee_bus_type = {
 	.name		= "tee",
 	.match		= tee_client_device_match,
 	.uevent		= tee_client_device_uevent,
diff --git a/include/linux/tee_drv.h b/include/linux/tee_drv.h
index 911ddf92dcee..71632e3c5f18 100644
--- a/include/linux/tee_drv.h
+++ b/include/linux/tee_drv.h
@@ -482,7 +482,7 @@ static inline bool tee_param_is_memref(struct tee_param *param)
 	}
 }

-extern struct bus_type tee_bus_type;
+extern const struct bus_type tee_bus_type;

 /**
  * struct tee_client_device - tee based device

---
base-commit: 716f4aaa7b48a55c73d632d0657b35342b1fefd7
change-id: 20240213-bus_cleanup-tee-c25729bbcd7f

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