linux-kernel - [PATCH] drivers: rapidio: make rio_bus

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Message-ID: <20250919073201.751348-1-abarnas@google.com>
Date: Fri, 19 Sep 2025 07:32:01 +0000
From: "Adrian Barnaś" <abarnas@...gle.com>
To: Matt Porter <mporter@...nel.crashing.org>, Alexandre Bounine <alex.bou9@...il.com>, 
	linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
	"Adrian Barnaś" <abarnas@...gle.com>
Subject: [PATCH] drivers: rapidio: make rio_bus_type const

Because driver core can properly handle constant struct bus_type,
move the rio_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/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 238250e69005..bcfe0b45b377 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 3c29f40f3c94..2c29f21ba9e5 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;
-- 
2.51.0.534.gc79095c0ca-goog