linux-kernel - [PATCH 2/2] ARM: ecard: make ecard_bus

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Message-Id: <20240211-bus_cleanup-rmk-v1-2-65668e578d55@marliere.net>
Date: Sun, 11 Feb 2024 12:45:08 -0300
From: "Ricardo B. Marliere" <ricardo@...liere.net>
To: Russell King <linux@...linux.org.uk>
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 "Ricardo B. Marliere" <ricardo@...liere.net>
Subject: [PATCH 2/2] ARM: ecard: make ecard_bus_type const

Now that the driver core can properly handle constant struct bus_type,
move the ecard_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>
---
 arch/arm/include/asm/ecard.h | 2 +-
 arch/arm/mach-rpc/ecard.c    | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm/include/asm/ecard.h b/arch/arm/include/asm/ecard.h
index 4befe8d2ae19..7cbe001bf9cc 100644
--- a/arch/arm/include/asm/ecard.h
+++ b/arch/arm/include/asm/ecard.h
@@ -195,7 +195,7 @@ void __iomem *ecardm_iomap(struct expansion_card *ec, unsigned int res,
 			   unsigned long offset, unsigned long maxsize);
 #define ecardm_iounmap(__ec, __addr)	devm_iounmap(&(__ec)->dev, __addr)

-extern struct bus_type ecard_bus_type;
+extern const struct bus_type ecard_bus_type;

 #define ECARD_DEV(_d)	container_of((_d), struct expansion_card, dev)

diff --git a/arch/arm/mach-rpc/ecard.c b/arch/arm/mach-rpc/ecard.c
index c30df1097c52..4b843cffcac2 100644
--- a/arch/arm/mach-rpc/ecard.c
+++ b/arch/arm/mach-rpc/ecard.c
@@ -1124,7 +1124,7 @@ static int ecard_match(struct device *_dev, struct device_driver *_drv)
 	return ret;
 }

-struct bus_type ecard_bus_type = {
+const struct bus_type ecard_bus_type = {
 	.name		= "ecard",
 	.dev_groups	= ecard_dev_groups,
 	.match		= ecard_match,

-- 
2.43.0