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Device properties framework update for 4.18-rc1

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Modify the device properties framework to remove union aliasing
 from it (Andy Shevchenko).
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Merge tag 'dp-4.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull device properties framework update from Rafael Wysocki:
 "Modify the device properties framework to remove union aliasing from
  it (Andy Shevchenko)"

* tag 'dp-4.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  device property: Get rid of union aliasing
This commit is contained in:
Linus Torvalds 2018-06-05 10:13:13 -07:00
commit a74e0c4c9c
3 changed files with 117 additions and 47 deletions
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104
drivers/base/property.c
View File

@ -56,6 +56,72 @@ pset_prop_get(const struct property_set *pset, const char *name)
return NULL;
}
static const void *property_get_pointer(const struct property_entry *prop)
{
switch (prop->type) {
case DEV_PROP_U8:
if (prop->is_array)
return prop->pointer.u8_data;
return &prop->value.u8_data;
case DEV_PROP_U16:
if (prop->is_array)
return prop->pointer.u16_data;
return &prop->value.u16_data;
case DEV_PROP_U32:
if (prop->is_array)
return prop->pointer.u32_data;
return &prop->value.u32_data;
case DEV_PROP_U64:
if (prop->is_array)
return prop->pointer.u64_data;
return &prop->value.u64_data;
case DEV_PROP_STRING:
if (prop->is_array)
return prop->pointer.str;
return &prop->value.str;
default:
return NULL;
}
}
static void property_set_pointer(struct property_entry *prop, const void *pointer)
{
switch (prop->type) {
case DEV_PROP_U8:
if (prop->is_array)
prop->pointer.u8_data = pointer;
else
prop->value.u8_data = *((u8 *)pointer);
break;
case DEV_PROP_U16:
if (prop->is_array)
prop->pointer.u16_data = pointer;
else
prop->value.u16_data = *((u16 *)pointer);
break;
case DEV_PROP_U32:
if (prop->is_array)
prop->pointer.u32_data = pointer;
else
prop->value.u32_data = *((u32 *)pointer);
break;
case DEV_PROP_U64:
if (prop->is_array)
prop->pointer.u64_data = pointer;
else
prop->value.u64_data = *((u64 *)pointer);
break;
case DEV_PROP_STRING:
if (prop->is_array)
prop->pointer.str = pointer;
else
prop->value.str = pointer;
break;
default:
break;
}
}
static const void *pset_prop_find(const struct property_set *pset,
const char *propname, size_t length)
{
@ -65,10 +131,7 @@ static const void *pset_prop_find(const struct property_set *pset,
prop = pset_prop_get(pset, propname);
if (!prop)
return ERR_PTR(-EINVAL);
if (prop->is_array)
pointer = prop->pointer.raw_data;
else
pointer = &prop->value.raw_data;
pointer = property_get_pointer(prop);
if (!pointer)
return ERR_PTR(-ENODATA);
if (length > prop->length)
@ -698,16 +761,17 @@ EXPORT_SYMBOL_GPL(fwnode_property_get_reference_args);
static void property_entry_free_data(const struct property_entry *p)
{
const void *pointer = property_get_pointer(p);
size_t i, nval;
if (p->is_array) {
if (p->is_string && p->pointer.str) {
if (p->type == DEV_PROP_STRING && p->pointer.str) {
nval = p->length / sizeof(const char *);
for (i = 0; i < nval; i++)
kfree(p->pointer.str[i]);
}
kfree(p->pointer.raw_data);
} else if (p->is_string) {
kfree(pointer);
} else if (p->type == DEV_PROP_STRING) {
kfree(p->value.str);
}
kfree(p->name);
@ -716,7 +780,7 @@ static void property_entry_free_data(const struct property_entry *p)
static int property_copy_string_array(struct property_entry *dst,
const struct property_entry *src)
{
char **d;
const char **d;
size_t nval = src->length / sizeof(*d);
int i;
@ -734,40 +798,44 @@ static int property_copy_string_array(struct property_entry *dst,
}
}
dst->pointer.raw_data = d;
dst->pointer.str = d;
return 0;
}
static int property_entry_copy_data(struct property_entry *dst,
const struct property_entry *src)
{
const void *pointer = property_get_pointer(src);
const void *new;
int error;
if (src->is_array) {
if (!src->length)
return -ENODATA;
if (src->is_string) {
if (src->type == DEV_PROP_STRING) {
error = property_copy_string_array(dst, src);
if (error)
return error;
new = dst->pointer.str;
} else {
dst->pointer.raw_data = kmemdup(src->pointer.raw_data,
src->length, GFP_KERNEL);
if (!dst->pointer.raw_data)
new = kmemdup(pointer, src->length, GFP_KERNEL);
if (!new)
return -ENOMEM;
}
} else if (src->is_string) {
dst->value.str = kstrdup(src->value.str, GFP_KERNEL);
if (!dst->value.str && src->value.str)
} else if (src->type == DEV_PROP_STRING) {
new = kstrdup(src->value.str, GFP_KERNEL);
if (!new && src->value.str)
return -ENOMEM;
} else {
dst->value.raw_data = src->value.raw_data;
new = pointer;
}
dst->length = src->length;
dst->is_array = src->is_array;
dst->is_string = src->is_string;
dst->type = src->type;
property_set_pointer(dst, new);
dst->name = kstrdup(src->name, GFP_KERNEL);
if (!dst->name)

8
drivers/firmware/efi/apple-properties.c
View File

@ -13,6 +13,9 @@
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*
* Note, all properties are considered as u8 arrays.
* To get a value of any of them the caller must use device_property_read_u8_array().
*/
#define pr_fmt(fmt) "apple-properties: " fmt
@ -96,12 +99,13 @@ static void __init unmarshal_key_value_pairs(struct dev_header *dev_header,
entry[i].name = key;
entry[i].length = val_len - sizeof(val_len);
entry[i].is_array = !!entry[i].length;
entry[i].pointer.raw_data = ptr + key_len + sizeof(val_len);
entry[i].type = DEV_PROP_U8;
entry[i].pointer.u8_data = ptr + key_len + sizeof(val_len);
if (dump_properties) {
dev_info(dev, "property: %s\n", entry[i].name);
print_hex_dump(KERN_INFO, pr_fmt(), DUMP_PREFIX_OFFSET,
16, 1, entry[i].pointer.raw_data,
16, 1, entry[i].pointer.u8_data,
entry[i].length, true);
}

52
include/linux/property.h
View File

@ -178,7 +178,7 @@ static inline int fwnode_property_read_u64(const struct fwnode_handle *fwnode,
* @name: Name of the property.
* @length: Length of data making up the value.
* @is_array: True when the property is an array.
* @is_string: True when property is a string.
* @type: Type of the data in unions.
* @pointer: Pointer to the property (an array of items of the given type).
* @value: Value of the property (when it is a single item of the given type).
*/
@ -186,10 +186,9 @@ struct property_entry {
const char *name;
size_t length;
bool is_array;
bool is_string;
enum dev_prop_type type;
union {
union {
const void *raw_data;
const u8 *u8_data;
const u16 *u16_data;
const u32 *u32_data;
@ -197,7 +196,6 @@ struct property_entry {
const char * const *str;
} pointer;
union {
unsigned long long raw_data;
u8 u8_data;
u16 u16_data;
u32 u32_data;
@ -213,55 +211,55 @@ struct property_entry {
* and structs.
*/
#define PROPERTY_ENTRY_INTEGER_ARRAY(_name_, _type_, _val_) \
(struct property_entry) { \
.name = _name_, \
.length = ARRAY_SIZE(_val_) * sizeof(_type_), \
.is_array = true, \
.is_string = false, \
{ .pointer = { ._type_##_data = _val_ } }, \
#define PROPERTY_ENTRY_INTEGER_ARRAY(_name_, _type_, _Type_, _val_) \
(struct property_entry) { \
.name = _name_, \
.length = ARRAY_SIZE(_val_) * sizeof(_type_), \
.is_array = true, \
.type = DEV_PROP_##_Type_, \
{ .pointer = { ._type_##_data = _val_ } }, \
}
#define PROPERTY_ENTRY_U8_ARRAY(_name_, _val_) \
PROPERTY_ENTRY_INTEGER_ARRAY(_name_, u8, _val_)
PROPERTY_ENTRY_INTEGER_ARRAY(_name_, u8, U8, _val_)
#define PROPERTY_ENTRY_U16_ARRAY(_name_, _val_) \
PROPERTY_ENTRY_INTEGER_ARRAY(_name_, u16, _val_)
PROPERTY_ENTRY_INTEGER_ARRAY(_name_, u16, U16, _val_)
#define PROPERTY_ENTRY_U32_ARRAY(_name_, _val_) \
PROPERTY_ENTRY_INTEGER_ARRAY(_name_, u32, _val_)
PROPERTY_ENTRY_INTEGER_ARRAY(_name_, u32, U32, _val_)
#define PROPERTY_ENTRY_U64_ARRAY(_name_, _val_) \
PROPERTY_ENTRY_INTEGER_ARRAY(_name_, u64, _val_)
PROPERTY_ENTRY_INTEGER_ARRAY(_name_, u64, U64, _val_)
#define PROPERTY_ENTRY_STRING_ARRAY(_name_, _val_) \
(struct property_entry) { \
.name = _name_, \
.length = ARRAY_SIZE(_val_) * sizeof(const char *), \
.is_array = true, \
.is_string = true, \
.type = DEV_PROP_STRING, \
{ .pointer = { .str = _val_ } }, \
}
#define PROPERTY_ENTRY_INTEGER(_name_, _type_, _val_) \
(struct property_entry) { \
.name = _name_, \
.length = sizeof(_type_), \
.is_string = false, \
{ .value = { ._type_##_data = _val_ } }, \
#define PROPERTY_ENTRY_INTEGER(_name_, _type_, _Type_, _val_) \
(struct property_entry) { \
.name = _name_, \
.length = sizeof(_type_), \
.type = DEV_PROP_##_Type_, \
{ .value = { ._type_##_data = _val_ } }, \
}
#define PROPERTY_ENTRY_U8(_name_, _val_) \
PROPERTY_ENTRY_INTEGER(_name_, u8, _val_)
PROPERTY_ENTRY_INTEGER(_name_, u8, U8, _val_)
#define PROPERTY_ENTRY_U16(_name_, _val_) \
PROPERTY_ENTRY_INTEGER(_name_, u16, _val_)
PROPERTY_ENTRY_INTEGER(_name_, u16, U16, _val_)
#define PROPERTY_ENTRY_U32(_name_, _val_) \
PROPERTY_ENTRY_INTEGER(_name_, u32, _val_)
PROPERTY_ENTRY_INTEGER(_name_, u32, U32, _val_)
#define PROPERTY_ENTRY_U64(_name_, _val_) \
PROPERTY_ENTRY_INTEGER(_name_, u64, _val_)
PROPERTY_ENTRY_INTEGER(_name_, u64, U64, _val_)
#define PROPERTY_ENTRY_STRING(_name_, _val_) \
(struct property_entry) { \
.name = _name_, \
.length = sizeof(_val_), \
.is_string = true, \
.type = DEV_PROP_STRING, \
{ .value = { .str = _val_ } }, \
}