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@linuxfoundation.org>
Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ricardo B. Marliere <ricardo@marliere.net>
Acked-by: Nuno Sa <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20240208-bus_cleanup-iio-v1-1-4a167c3b5fb3@marliere.net
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index e8551a1636bac49c9d7dda3ab711acfe7572b775..9b2877fe8689872623211631887cc936d8facb1f 100644 (file)
--- 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 4f89279e531cda2de694d82506cfd82cf7f11d07..e370a7bb3300b770f614696c55e2225f8b3e8464 100644 (file)
--- 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