linux-kernel - [PATCH] slimbus: core: make slimbus

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Message-Id: <20240213-bus_cleanup-slimbus-v1-1-34f06d82de6e@marliere.net>
Date: Tue, 13 Feb 2024 11:40:35 -0300
From: "Ricardo B. Marliere" <ricardo@...liere.net>
To: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc: alsa-devel@...a-project.org, linux-kernel@...r.kernel.org, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 "Ricardo B. Marliere" <ricardo@...liere.net>
Subject: [PATCH] slimbus: core: make slimbus_bus const

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 slimbus_bus 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>
---
This patch is based on
https://git.kernel.org/pub/scm/linux/kernel/git/srini/slimbus.git/,
should this tree be listed under "SERIAL LOW-POWER INTER-CHIP MEDIA BUS
(SLIMbus)" in the MAINTAINERS file?
---
 drivers/slimbus/core.c  | 2 +-
 include/linux/slimbus.h | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/slimbus/core.c b/drivers/slimbus/core.c
index d43873bb5fe6..375218e02e28 100644
--- a/drivers/slimbus/core.c
+++ b/drivers/slimbus/core.c
@@ -100,7 +100,7 @@ static int slim_device_uevent(const struct device *dev, struct kobj_uevent_env *
 	return add_uevent_var(env, "MODALIAS=slim:%s", dev_name(&sbdev->dev));
 }

-struct bus_type slimbus_bus = {
+const struct bus_type slimbus_bus = {
 	.name		= "slimbus",
 	.match		= slim_device_match,
 	.probe		= slim_device_probe,
diff --git a/include/linux/slimbus.h b/include/linux/slimbus.h
index 12c9719b2a55..3042385b7b40 100644
--- a/include/linux/slimbus.h
+++ b/include/linux/slimbus.h
@@ -10,7 +10,7 @@
 #include <linux/completion.h>
 #include <linux/mod_devicetable.h>

-extern struct bus_type slimbus_bus;
+extern const struct bus_type slimbus_bus;

 /**
  * struct slim_eaddr - Enumeration address for a SLIMbus device

---
base-commit: 04b945e4cf81a12365f8207a4d34dbc81ba17413
change-id: 20240213-bus_cleanup-slimbus-e23b9e976fd2

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