linux-kernel - [PATCH v4] staging: greybus: Constify gb_audio_module

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Date: Fri, 15 Mar 2024 00:18:01 +0530
From: Ayush Tiwari <ayushtiw0110@...il.com>
To: Larry.Finger@...inger.net, florian.c.schilhabel@...glemail.com,
	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
	linux-staging@...ts.linux.dev
Cc: outreachy@...ts.linux.dev
Subject: [PATCH v4] staging: greybus: Constify gb_audio_module_type

Constify static struct kobj_type gb_audio_module_type to prevent
modification of data shared across many instances, ensuring that the
structure's usage is consistent and predictable throughout the driver
and allows the compiler to place it in read-only memory.
The gb_audio_module_type structure is used when initializing and
adding kobj instances to the kernel's object hierarchy.
After adding const, any attempt to alter gb_audio_module_type
in the code is raising a compile-time error. This enforcement
ensures that the sysfs interface and operations for audio
modules remain stable.

Signed-off-by: Ayush Tiwari <ayushtiw0110@...il.com>

---
Changes in v4: added more details verifying the change.

Changes in v3: added the message that verifies the change,
as suggested by Julia

Changes in v2: incorporated changes in commit message
as suggested by Alison
---
 drivers/staging/greybus/audio_manager_module.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/greybus/audio_manager_module.c b/drivers/staging/greybus/audio_manager_module.c
index 5f9dcbdbc191..4a4dfb42f50f 100644
--- a/drivers/staging/greybus/audio_manager_module.c
+++ b/drivers/staging/greybus/audio_manager_module.c
@@ -144,7 +144,7 @@ static struct attribute *gb_audio_module_default_attrs[] = {
 };
 ATTRIBUTE_GROUPS(gb_audio_module_default);

-static struct kobj_type gb_audio_module_type = {
+static const struct kobj_type gb_audio_module_type = {
 	.sysfs_ops = &gb_audio_module_sysfs_ops,
 	.release = gb_audio_module_release,
 	.default_groups = gb_audio_module_default_groups,
-- 
2.40.1