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Date: Thu, 26 Apr 2018 13:23:56 +0300
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-kernel@...r.kernel.org,
Ard Biesheuvel <ard.biesheuvel@...aro.org>,
linux-efi@...r.kernel.org,
Sakari Ailus <sakari.ailus@...ux.intel.com>,
Mika Westerberg <mika.westerberg@...ux.intel.com>,
"Rafael J . Wysocki" <rjw@...ysocki.net>,
ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
Lukas Wunner <lukas@...ner.de>
Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v1] device property: Get rid of union aliasing
The commit
318a19718261 ("device property: refactor built-in properties support")
went way too far and brought a union aliasing. Partially revert it here
to get rid of union aliasing.
Note, Apple properties support is still utilizing this trick.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
drivers/base/property.c | 99 ++++++++++++++++++++-----
drivers/firmware/efi/apple-properties.c | 8 +-
include/linux/property.h | 52 +++++++------
3 files changed, 112 insertions(+), 47 deletions(-)
diff --git a/drivers/base/property.c b/drivers/base/property.c
index 8f205f6461ed..de19d7cc073b 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -56,6 +56,67 @@ 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;
+ default:
+ if (prop->is_array)
+ return prop->pointer.str;
+ return &prop->value.str;
+ }
+}
+
+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;
+ default:
+ if (prop->is_array)
+ prop->pointer.str = pointer;
+ else
+ prop->value.str = pointer;
+ }
+}
+
static const void *pset_prop_find(const struct property_set *pset,
const char *propname, size_t length)
{
@@ -65,10 +126,7 @@ 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 +756,17 @@ 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 +775,7 @@ 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 +793,44 @@ 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)
diff --git a/drivers/firmware/efi/apple-properties.c b/drivers/firmware/efi/apple-properties.c
index adaa9a3714b9..b2c2d5a45f91 100644
--- a/drivers/firmware/efi/apple-properties.c
+++ b/drivers/firmware/efi/apple-properties.c
@@ -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/>.
+ *
+ * FIXME: The approach is still based on union aliasing and should be
+ * replaced by a proper resource provider.
*/
#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);
}
diff --git a/include/linux/property.h b/include/linux/property.h
index 2eea4b310fc2..ac8a1ebc4c1b 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -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_ } }, \
}
--
2.17.0
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