[PATCH 03/21] driver core: bus: constantify the bus_find_* functions

Greg Kroah-Hartman
2023-02-08T11:15:38Z

All of the bus find and iterator functions do not modify the struct
bus_type passed to them, so mark them as constant to enforce this rule.

Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/base/bus.c | 6 +++---
include/linux/device/bus.h | 20 ++++++++++----------
2 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index d346afa4645c..7949302663f9 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -331,7 +331,7 @@ static struct device *next_device(struct klist_iter *i)
* to retain this data, it should do so, and increment the reference
* count in the supplied callback.
*/
-int bus_for_each_dev(struct bus_type *bus, struct device *start,
+int bus_for_each_dev(const struct bus_type *bus, struct device *start,
void *data, int (*fn)(struct device *, void *))
{
struct klist_iter i;
@@ -365,7 +365,7 @@ EXPORT_SYMBOL_GPL(bus_for_each_dev);
* if it does. If the callback returns non-zero, this function will
* return to the caller and not iterate over any more devices.
*/
-struct device *bus_find_device(struct bus_type *bus,
+struct device *bus_find_device(const struct bus_type *bus,
struct device *start, const void *data,
int (*match)(struct device *dev, const void *data))
{
@@ -416,7 +416,7 @@ static struct device_driver *next_driver(struct klist_iter *i)
* in the callback. It must also be sure to increment the refcount
* so it doesn't disappear before returning to the caller.
*/
-int bus_for_each_drv(struct bus_type *bus, struct device_driver *start,
+int bus_for_each_drv(const struct bus_type *bus, struct device_driver *start,
void *data, int (*fn)(struct device_driver *, void *))
{
struct klist_iter i;
diff --git a/include/linux/device/bus.h b/include/linux/device/bus.h
index e3094db1e9fa..f0c8bf91b07a 100644
--- a/include/linux/device/bus.h
+++ b/include/linux/device/bus.h
@@ -149,9 +149,9 @@ int device_match_acpi_handle(struct device *dev, const void *handle);
int device_match_any(struct device *dev, const void *unused);

/* iterator helpers for buses */
-int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
+int bus_for_each_dev(const struct bus_type *bus, struct device *start, void *data,
int (*fn)(struct device *dev, void *data));
-struct device *bus_find_device(struct bus_type *bus, struct device *start,
+struct device *bus_find_device(const struct bus_type *bus, struct device *start,
const void *data,
int (*match)(struct device *dev, const void *data));
/**
@@ -161,7 +161,7 @@ struct device *bus_find_device(struct bus_type *bus, struct device *start,
* @start: Device to begin with
* @name: name of the device to match
*/
-static inline struct device *bus_find_device_by_name(struct bus_type *bus,
+static inline struct device *bus_find_device_by_name(const struct bus_type *bus,
struct device *start,
const char *name)
{
@@ -175,7 +175,7 @@ static inline struct device *bus_find_device_by_name(struct bus_type *bus,
* @np: of_node of the device to match.
*/
static inline struct device *
-bus_find_device_by_of_node(struct bus_type *bus, const struct device_node *np)
+bus_find_device_by_of_node(const struct bus_type *bus, const struct device_node *np)
{
return bus_find_device(bus, NULL, np, device_match_of_node);
}
@@ -187,7 +187,7 @@ bus_find_device_by_of_node(struct bus_type *bus, const struct device_node *np)
* @fwnode: fwnode of the device to match.
*/
static inline struct device *
-bus_find_device_by_fwnode(struct bus_type *bus, const struct fwnode_handle *fwnode)
+bus_find_device_by_fwnode(const struct bus_type *bus, const struct fwnode_handle *fwnode)
{
return bus_find_device(bus, NULL, fwnode, device_match_fwnode);
}
@@ -198,7 +198,7 @@ bus_find_device_by_fwnode(struct bus_type *bus, const struct fwnode_handle *fwno
* @bus: bus type
* @devt: device type of the device to match.
*/
-static inline struct device *bus_find_device_by_devt(struct bus_type *bus,
+static inline struct device *bus_find_device_by_devt(const struct bus_type *bus,
dev_t devt)
{
return bus_find_device(bus, NULL, &devt, device_match_devt);
@@ -211,7 +211,7 @@ static inline struct device *bus_find_device_by_devt(struct bus_type *bus,
* @cur: device to begin the search with.
*/
static inline struct device *
-bus_find_next_device(struct bus_type *bus,struct device *cur)
+bus_find_next_device(const struct bus_type *bus,struct device *cur)
{
return bus_find_device(bus, cur, NULL, device_match_any);
}
@@ -226,19 +226,19 @@ struct acpi_device;
* @adev: ACPI COMPANION device to match.
*/
static inline struct device *
-bus_find_device_by_acpi_dev(struct bus_type *bus, const struct acpi_device *adev)
+bus_find_device_by_acpi_dev(const struct bus_type *bus, const struct acpi_device *adev)
{
return bus_find_device(bus, NULL, adev, device_match_acpi_dev);
}
#else
static inline struct device *
-bus_find_device_by_acpi_dev(struct bus_type *bus, const void *adev)
+bus_find_device_by_acpi_dev(const struct bus_type *bus, const void *adev)
{
return NULL;
}
#endif

-int bus_for_each_drv(struct bus_type *bus, struct device_driver *start,
+int bus_for_each_drv(const struct bus_type *bus, struct device_driver *start,
void *data, int (*fn)(struct device_driver *, void *));
void bus_sort_breadthfirst(struct bus_type *bus,
int (*compare)(const struct device *a,
--
2.39.1