linux-kernel - [PATCH] bus: fsl-mc: make fsl_mc_bus

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Message-ID: <20240823062440.113628-1-kunwu.chan@linux.dev>
Date: Fri, 23 Aug 2024 14:24:40 +0800
From: Kunwu Chan <kunwu.chan@...ux.dev>
To: stuyoder@...il.com,
	laurentiu.tudor@....com,
	christophe.leroy@...roup.eu
Cc: linux-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org,
	linux-arm-kernel@...ts.infradead.org,
	Kunwu Chan <chentao@...inos.cn>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH] bus: fsl-mc: make fsl_mc_bus_type const

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 fsl_mc_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/bus/fsl-mc/fsl-mc-bus.c | 2 +-
 include/linux/fsl/mc.h          | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/bus/fsl-mc/fsl-mc-bus.c b/drivers/bus/fsl-mc/fsl-mc-bus.c
index dd68b8191a0a..930d8a3ba722 100644
--- a/drivers/bus/fsl-mc/fsl-mc-bus.c
+++ b/drivers/bus/fsl-mc/fsl-mc-bus.c
@@ -309,7 +309,7 @@ static struct attribute *fsl_mc_bus_attrs[] = {
 
 ATTRIBUTE_GROUPS(fsl_mc_bus);
 
-struct bus_type fsl_mc_bus_type = {
+const struct bus_type fsl_mc_bus_type = {
 	.name = "fsl-mc",
 	.match = fsl_mc_bus_match,
 	.uevent = fsl_mc_bus_uevent,
diff --git a/include/linux/fsl/mc.h b/include/linux/fsl/mc.h
index 083c860fd28e..c90ec889bfc2 100644
--- a/include/linux/fsl/mc.h
+++ b/include/linux/fsl/mc.h
@@ -436,7 +436,7 @@ void fsl_mc_free_irqs(struct fsl_mc_device *mc_dev);
 struct fsl_mc_device *fsl_mc_get_endpoint(struct fsl_mc_device *mc_dev,
 					  u16 if_id);
 
-extern struct bus_type fsl_mc_bus_type;
+extern const struct bus_type fsl_mc_bus_type;
 
 extern struct device_type fsl_mc_bus_dprc_type;
 extern struct device_type fsl_mc_bus_dpni_type;
-- 
2.43.0