linux-kernel - [PATCH] mips: bus: make mips_cdmm

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Date: Tue, 13 Feb 2024 11:49:24 -0300
From: "Ricardo B. Marliere" <ricardo@...liere.net>
To: Thomas Bogendoerfer <tsbogend@...ha.franken.de>, 
 Serge Semin <fancer.lancer@...il.com>
Cc: linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 "Ricardo B. Marliere" <ricardo@...liere.net>
Subject: [PATCH] mips: bus: make mips_cdmm_bustype const

Now that the driver core can properly handle constant struct bus_type,
move the mips_cdmm_bustype 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/mips/include/asm/cdmm.h | 2 +-
 drivers/bus/mips_cdmm.c      | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/mips/include/asm/cdmm.h b/arch/mips/include/asm/cdmm.h
index c06dbf8ba937..81fa99084178 100644
--- a/arch/mips/include/asm/cdmm.h
+++ b/arch/mips/include/asm/cdmm.h
@@ -63,7 +63,7 @@ struct mips_cdmm_driver {
  */
 phys_addr_t mips_cdmm_phys_base(void);
 
-extern struct bus_type mips_cdmm_bustype;
+extern const struct bus_type mips_cdmm_bustype;
 void __iomem *mips_cdmm_early_probe(unsigned int dev_type);
 
 #define to_mips_cdmm_device(d)	container_of(d, struct mips_cdmm_device, dev)
diff --git a/drivers/bus/mips_cdmm.c b/drivers/bus/mips_cdmm.c
index 554e1992edd4..8baf14bd5eff 100644
--- a/drivers/bus/mips_cdmm.c
+++ b/drivers/bus/mips_cdmm.c
@@ -118,7 +118,7 @@ static struct attribute *mips_cdmm_dev_attrs[] = {
 };
 ATTRIBUTE_GROUPS(mips_cdmm_dev);
 
-struct bus_type mips_cdmm_bustype = {
+const struct bus_type mips_cdmm_bustype = {
 	.name		= "cdmm",
 	.dev_groups	= mips_cdmm_dev_groups,
 	.match		= mips_cdmm_match,

---
base-commit: 841c35169323cd833294798e58b9bf63fa4fa1de
change-id: 20240213-bus_cleanup-mips2-434cc6d8f7bd

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