linux-kernel - [PATCH] cdx: make cdx_bus

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Message-ID: <20240823071412.130246-1-kunwu.chan@linux.dev>
Date: Fri, 23 Aug 2024 15:14:12 +0800
From: Kunwu Chan <kunwu.chan@...ux.dev>
To: nipun.gupta@....com,
	nikhil.agarwal@....com
Cc: linux-kernel@...r.kernel.org,
	Kunwu Chan <chentao@...inos.cn>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH] cdx: make cdx_bus_type constant

From: Kunwu Chan <chentao@...inos.cn>

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 cdx_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: Kunwu Chan <chentao@...inos.cn>
---
 drivers/cdx/cdx.c           | 2 +-
 include/linux/cdx/cdx_bus.h | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/cdx/cdx.c b/drivers/cdx/cdx.c
index 07371cb653d3..e92164ae88a9 100644
--- a/drivers/cdx/cdx.c
+++ b/drivers/cdx/cdx.c
@@ -643,7 +643,7 @@ static struct attribute *cdx_bus_attrs[] = {
 };
 ATTRIBUTE_GROUPS(cdx_bus);
 
-struct bus_type cdx_bus_type = {
+const struct bus_type cdx_bus_type = {
 	.name		= "cdx",
 	.match		= cdx_bus_match,
 	.probe		= cdx_probe,
diff --git a/include/linux/cdx/cdx_bus.h b/include/linux/cdx/cdx_bus.h
index 79bb80e56790..b1ba97f6c9ad 100644
--- a/include/linux/cdx/cdx_bus.h
+++ b/include/linux/cdx/cdx_bus.h
@@ -234,7 +234,7 @@ int __must_check __cdx_driver_register(struct cdx_driver *cdx_driver,
  */
 void cdx_driver_unregister(struct cdx_driver *cdx_driver);
 
-extern struct bus_type cdx_bus_type;
+extern const struct bus_type cdx_bus_type;
 
 /**
  * cdx_dev_reset - Reset CDX device
-- 
2.41.0