[PATCH v2 2/4] device property: allow to constify properties

Dmitry Torokhov
2017-02-01T02:11:35Z

There is no reason why statically defined properties should be modifiable,
so let's make device_add_properties() and the rest of pset_*() functions to
take const pointers to properties.

This will allow us to mark properties as const/__initconst at definition
sites.

Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
---
drivers/base/property.c | 35 ++++++++++++++++++-----------------
include/linux/property.h | 2 +-
2 files changed, 19 insertions(+), 18 deletions(-)

diff --git a/drivers/base/property.c b/drivers/base/property.c
index 934845fc72e5..edc09854520b 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -21,7 +21,7 @@

struct property_set {
struct fwnode_handle fwnode;
- struct property_entry *properties;
+ const struct property_entry *properties;
};

static inline bool is_pset_node(struct fwnode_handle *fwnode)
@@ -35,10 +35,10 @@ static inline struct property_set *to_pset_node(struct fwnode_handle *fwnode)
container_of(fwnode, struct property_set, fwnode) : NULL;
}

-static struct property_entry *pset_prop_get(struct property_set *pset,
- const char *name)
+static const struct property_entry *pset_prop_get(struct property_set *pset,
+ const char *name)
{
- struct property_entry *prop;
+ const struct property_entry *prop;

if (!pset || !pset->properties)
return NULL;
@@ -50,11 +50,11 @@ static struct property_entry *pset_prop_get(struct property_set *pset,
return NULL;
}

-static void *pset_prop_find(struct property_set *pset, const char *propname,
- size_t length)
+static const void *pset_prop_find(struct property_set *pset,
+ const char *propname, size_t length)
{
- struct property_entry *prop;
- void *pointer;
+ const struct property_entry *prop;
+ const void *pointer;

prop = pset_prop_get(pset, propname);
if (!prop)
@@ -74,7 +74,7 @@ static int pset_prop_read_u8_array(struct property_set *pset,
const char *propname,
u8 *values, size_t nval)
{
- void *pointer;
+ const void *pointer;
size_t length = nval * sizeof(*values);

pointer = pset_prop_find(pset, propname, length);
@@ -89,7 +89,7 @@ static int pset_prop_read_u16_array(struct property_set *pset,
const char *propname,
u16 *values, size_t nval)
{
- void *pointer;
+ const void *pointer;
size_t length = nval * sizeof(*values);

pointer = pset_prop_find(pset, propname, length);
@@ -104,7 +104,7 @@ static int pset_prop_read_u32_array(struct property_set *pset,
const char *propname,
u32 *values, size_t nval)
{
- void *pointer;
+ const void *pointer;
size_t length = nval * sizeof(*values);

pointer = pset_prop_find(pset, propname, length);
@@ -119,7 +119,7 @@ static int pset_prop_read_u64_array(struct property_set *pset,
const char *propname,
u64 *values, size_t nval)
{
- void *pointer;
+ const void *pointer;
size_t length = nval * sizeof(*values);

pointer = pset_prop_find(pset, propname, length);
@@ -133,7 +133,7 @@ static int pset_prop_read_u64_array(struct property_set *pset,
static int pset_prop_count_elems_of_size(struct property_set *pset,
const char *propname, size_t length)
{
- struct property_entry *prop;
+ const struct property_entry *prop;

prop = pset_prop_get(pset, propname);
if (!prop)
@@ -146,7 +146,7 @@ static int pset_prop_read_string_array(struct property_set *pset,
const char *propname,
const char **strings, size_t nval)
{
- void *pointer;
+ const void *pointer;
size_t length = nval * sizeof(*strings);

pointer = pset_prop_find(pset, propname, length);
@@ -160,8 +160,8 @@ static int pset_prop_read_string_array(struct property_set *pset,
static int pset_prop_read_string(struct property_set *pset,
const char *propname, const char **strings)
{
- struct property_entry *prop;
- const char **pointer;
+ const struct property_entry *prop;
+ const char * const *pointer;

prop = pset_prop_get(pset, propname);
if (!prop)
@@ -880,7 +880,8 @@ EXPORT_SYMBOL_GPL(device_remove_properties);
* @dev as its secondary firmware node. The function takes a copy of
* @properties.
*/
-int device_add_properties(struct device *dev, struct property_entry *properties)
+int device_add_properties(struct device *dev,
+ const struct property_entry *properties)
{
struct property_set *p, pset;

diff --git a/include/linux/property.h b/include/linux/property.h
index 48f154ae7e99..5746e9927016 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -247,7 +247,7 @@ property_entries_dup(const struct property_entry *properties);
void property_entries_free(const struct property_entry *properties);

int device_add_properties(struct device *dev,
- struct property_entry *properties);
+ const struct property_entry *properties);
void device_remove_properties(struct device *dev);

bool device_dma_supported(struct device *dev);
--
2.11.0.483.g087da7b7c-goog