linux-kernel - [PATCH] iio: core: make iio_bus

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Message-Id: <20240208-bus_cleanup-iio-v1-1-4a167c3b5fb3@marliere.net>
Date: Thu, 08 Feb 2024 16:37:19 -0300
From: "Ricardo B. Marliere" <ricardo@...liere.net>
To: Jonathan Cameron <jic23@...nel.org>, 
 Lars-Peter Clausen <lars@...afoo.de>
Cc: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 "Ricardo B. Marliere" <ricardo@...liere.net>
Subject: [PATCH] iio: core: make iio_bus_type const

Now that the driver core can properly handle constant struct bus_type,
move the iio_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>
---
 drivers/iio/industrialio-core.c | 2 +-
 include/linux/iio/iio.h         | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index e8551a1636ba..9b2877fe8689 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -42,7 +42,7 @@ static DEFINE_IDA(iio_ida);
 static dev_t iio_devt;

 #define IIO_DEV_MAX 256
-struct bus_type iio_bus_type = {
+const struct bus_type iio_bus_type = {
 	.name = "iio",
 };
 EXPORT_SYMBOL(iio_bus_type);
diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h
index 4f89279e531c..e370a7bb3300 100644
--- a/include/linux/iio/iio.h
+++ b/include/linux/iio/iio.h
@@ -669,7 +669,7 @@ DEFINE_GUARD_COND(iio_claim_direct, _try, ({
 int iio_device_claim_buffer_mode(struct iio_dev *indio_dev);
 void iio_device_release_buffer_mode(struct iio_dev *indio_dev);

-extern struct bus_type iio_bus_type;
+extern const struct bus_type iio_bus_type;

 /**
  * iio_device_put() - reference counted deallocation of struct device

---
base-commit: 81e8e40ea16329914f78ca1f454d04f570540ca8
change-id: 20240208-bus_cleanup-iio-1e5714e23bb9

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