[PATCH v4 6/8] driver core: Correct API device_for_each_child_reverse_from() prototype

Zijun Hu
2024-12-18T00:03:00Z

For API device_for_each_child_reverse_from(..., const void *data,
int (*fn)(struct device *dev, const void *data))

- Type of @data is const pointer, and means caller's data @*data is not
allowed to be modified, but that usually is not proper for such non
finding device iterating API.

- Types for both @data and @fn are not consistent with all other
for_each device iterating APIs device_for_each_child(_reverse)(),
bus_for_each_dev() and (driver|class)_for_each_device().

Correct its prototype by removing const from parameter types, then adapt
for various existing usages.

An dedicated typedef device_iter_t will be introduced as @fn() type for
various for_each device interating APIs later.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Zijun Hu <quic_zijuhu@quicinc.com>
---
drivers/base/core.c | 4 ++--
drivers/cxl/core/hdm.c | 2 +-
drivers/cxl/core/region.c | 2 +-
include/linux/device.h | 4 ++--
4 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 34fb13f914b3db47e6a047fdabf3c9b18ecc08cc..7be9c732bec1b060a477b362f555c3e87c8c7b91 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -4043,8 +4043,8 @@ EXPORT_SYMBOL_GPL(device_for_each_child_reverse);
* device_for_each_child_reverse_from();
*/
int device_for_each_child_reverse_from(struct device *parent,
- struct device *from, const void *data,
- int (*fn)(struct device *, const void *))
+ struct device *from, void *data,
+ int (*fn)(struct device *, void *))
{
struct klist_iter i;
struct device *child;
diff --git a/drivers/cxl/core/hdm.c b/drivers/cxl/core/hdm.c
index 28edd5822486851912393f066478252b20abc19d..50e6a45b30ba260c066a0781b9ed3a2f6f3462d7 100644
--- a/drivers/cxl/core/hdm.c
+++ b/drivers/cxl/core/hdm.c
@@ -703,7 +703,7 @@ static int cxl_decoder_commit(struct cxl_decoder *cxld)
return 0;
}

-static int commit_reap(struct device *dev, const void *data)
+static int commit_reap(struct device *dev, void *data)
{
struct cxl_port *port = to_cxl_port(dev->parent);
struct cxl_decoder *cxld;
diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
index bfecd71040c2f4373645380b4c31327d8b42d095..a4cff4c266e7a7dd6a3feb1513bf14b7d3f9afa2 100644
--- a/drivers/cxl/core/region.c
+++ b/drivers/cxl/core/region.c
@@ -778,7 +778,7 @@ static size_t show_targetN(struct cxl_region *cxlr, char *buf, int pos)
return rc;
}

-static int check_commit_order(struct device *dev, const void *data)
+static int check_commit_order(struct device *dev, void *data)
{
struct cxl_decoder *cxld = to_cxl_decoder(dev);

diff --git a/include/linux/device.h b/include/linux/device.h
index a9d928398895b062094b94f2c188cbe9951d7ac1..025bac08fca7b2513acb1fbcb666be1dc64f03d1 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -1079,8 +1079,8 @@ int device_for_each_child(struct device *parent, void *data,
int device_for_each_child_reverse(struct device *parent, void *data,
int (*fn)(struct device *dev, void *data));
int device_for_each_child_reverse_from(struct device *parent,
- struct device *from, const void *data,
- int (*fn)(struct device *, const void *));
+ struct device *from, void *data,
+ int (*fn)(struct device *, void *));
struct device *device_find_child(struct device *parent, const void *data,
device_match_t match);
struct device *device_find_child_by_name(struct device *parent,

--
2.34.1