linux-kernel - [PATCH] rapidio: make rio_bus

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Message-Id: <20240208-bus_cleanup-rapidio-v1-1-c69040ab0151@marliere.net>
Date: Thu, 08 Feb 2024 16:12:21 -0300
From: "Ricardo B. Marliere" <ricardo@...liere.net>
To: Matt Porter <mporter@...nel.crashing.org>, 
 Alexandre Bounine <alex.bou9@...il.com>
Cc: linux-kernel@...r.kernel.org, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 "Ricardo B. Marliere" <ricardo@...liere.net>
Subject: [PATCH] rapidio: make rio_bus_type const

Now that the driver core can properly handle constant struct bus_type,
move the rio_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/rapidio/rio-driver.c | 2 +-
 include/linux/rio.h          | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/rapidio/rio-driver.c b/drivers/rapidio/rio-driver.c
index 1b3b4c2e015d..2baef45ee5ff 100644
--- a/drivers/rapidio/rio-driver.c
+++ b/drivers/rapidio/rio-driver.c
@@ -227,7 +227,7 @@ struct class rio_mport_class = {
 };
 EXPORT_SYMBOL_GPL(rio_mport_class);

-struct bus_type rio_bus_type = {
+const struct bus_type rio_bus_type = {
 	.name = "rapidio",
 	.match = rio_match_bus,
 	.dev_groups = rio_dev_groups,
diff --git a/include/linux/rio.h b/include/linux/rio.h
index 2cd637268b4f..e9ca2fb7133f 100644
--- a/include/linux/rio.h
+++ b/include/linux/rio.h
@@ -78,7 +78,7 @@
 #define RIO_CTAG_RESRVD	0xfffe0000 /* Reserved */
 #define RIO_CTAG_UDEVID	0x0001ffff /* Unique device identifier */

-extern struct bus_type rio_bus_type;
+extern const struct bus_type rio_bus_type;
 extern struct class rio_mport_class;

 struct rio_mport;

---
base-commit: 547ab8fc4cb04a1a6b34377dd8fad34cd2c8a8e3
change-id: 20240208-bus_cleanup-rapidio-93b380dbbea5

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