[PATCH v2 1/5] device property: Keep dev_fwnode() and dev_fwnode_const() separate

Andy Shevchenko
2022-09-28T10:59:11Z

It's not fully correct to take a const parameter pointer to a struct
and return a non-const pointer to a member of that struct.

Instead, introduce a const version of the dev_fwnode() API which takes
and returns const pointers and use it where it's applicable.

Suggested-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Fixes: aade55c86033 ("device property: Add const qualifier to device_get_match_data() parameter")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Reviewed-by: Sakari Ailus <sakari.ailus@linux.intel.com>
---
drivers/base/property.c | 11 +++++++++--
include/linux/property.h | 3 ++-
2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/base/property.c b/drivers/base/property.c
index 4d6278a84868..699f1b115e0a 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -17,13 +17,20 @@
#include <linux/property.h>
#include <linux/phy.h>

-struct fwnode_handle *dev_fwnode(const struct device *dev)
+struct fwnode_handle *dev_fwnode(struct device *dev)
{
return IS_ENABLED(CONFIG_OF) && dev->of_node ?
of_fwnode_handle(dev->of_node) : dev->fwnode;
}
EXPORT_SYMBOL_GPL(dev_fwnode);

+const struct fwnode_handle *dev_fwnode_const(const struct device *dev)
+{
+ return IS_ENABLED(CONFIG_OF) && dev->of_node ?
+ of_fwnode_handle(dev->of_node) : dev->fwnode;
+}
+EXPORT_SYMBOL_GPL(dev_fwnode_const);
+
/**
* device_property_present - check if a property of a device is present
* @dev: Device whose property is being checked
@@ -1202,7 +1209,7 @@ EXPORT_SYMBOL(fwnode_graph_parse_endpoint);

const void *device_get_match_data(const struct device *dev)
{
- return fwnode_call_ptr_op(dev_fwnode(dev), device_get_match_data, dev);
+ return fwnode_call_ptr_op(dev_fwnode_const(dev), device_get_match_data, dev);
}
EXPORT_SYMBOL_GPL(device_get_match_data);

diff --git a/include/linux/property.h b/include/linux/property.h
index 117cc200c656..ae5d7f8eccf4 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -32,7 +32,8 @@ enum dev_dma_attr {
DEV_DMA_COHERENT,
};

-struct fwnode_handle *dev_fwnode(const struct device *dev);
+struct fwnode_handle *dev_fwnode(struct device *dev);
+const struct fwnode_handle *dev_fwnode_const(const struct device *dev);

bool device_property_present(struct device *dev, const char *propname);
int device_property_read_u8_array(struct device *dev, const char *propname,
--
2.35.1