When augmenting ACPI-enumerated devices with additional property data based
on DMI info, a module has often several potential property sets, with only
one being active on a given box. In order to save memory it should be
possible to mark everything and __initdata or __initconst, execute DMI
match early, and duplicate relevant properties. Then kernel will discard
the rest of them.
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
---
drivers/base/property.c | 194 +++++++++++++++++++++++++++++++----------------
include/linux/property.h | 5 ++
2 files changed, 134 insertions(+), 65 deletions(-)
diff --git a/drivers/base/property.c b/drivers/base/property.c
index 31b942a29fdc..c458c63e353f 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -682,77 +682,64 @@ int fwnode_property_match_string(struct fwnode_handle *fwnode,
}
EXPORT_SYMBOL_GPL(fwnode_property_match_string);
-/**
- * pset_free_set - releases memory allocated for copied property set
- * @pset: Property set to release
- *
- * Function takes previously copied property set and releases all the
- * memory allocated to it.
- */
-static void pset_free_set(struct property_set *pset)
+static int property_copy_string_array(struct property_entry *dst,
+ const struct property_entry *src)
{
- const struct property_entry *prop;
- size_t i, nval;
+ char **d;
+ size_t nval = src->length / sizeof(*d);
+ int i;
- if (!pset)
- return;
+ d = kcalloc(nval, sizeof(*d), GFP_KERNEL);
+ if (!d)
+ return -ENOMEM;
- for (prop = pset->properties; prop->name; prop++) {
- if (prop->is_array) {
- if (prop->is_string && prop->pointer.str) {
- nval = prop->length / sizeof(const char *);
- for (i = 0; i < nval; i++)
- kfree(prop->pointer.str[i]);
- }
- kfree(prop->pointer.raw_data);
- } else if (prop->is_string) {
- kfree(prop->value.str);
+ for (i = 0; i < nval; i++) {
+ d[i] = kstrdup(src->pointer.str[i], GFP_KERNEL);
+ if (!d[i] && src->pointer.str[i]) {
+ while (--i >= 0)
+ kfree(d[i]);
+ kfree(d);
+ return -ENOMEM;
}
- kfree(prop->name);
}
- kfree(pset->properties);
- kfree(pset);
+ dst->pointer.raw_data = d;
+ return 0;
}
-static int pset_copy_entry(struct property_entry *dst,
- const struct property_entry *src)
+static int property_entry_copy_data(struct property_entry *dst,
+ const struct property_entry *src)
{
- const char * const *s;
- char **d;
- size_t i, nval;
+ int error;
dst->name = kstrdup(src->name, GFP_KERNEL);
if (!dst->name)
return -ENOMEM;
if (src->is_array) {
- if (!src->length)
- return -ENODATA;
+ if (!src->length) {
+ error = -ENODATA;
+ goto out_free_name;
+ }
if (src->is_string) {
- nval = src->length / sizeof(const char *);
- d = kcalloc(nval, sizeof(const char *), GFP_KERNEL);
- if (!d)
- return -ENOMEM;
-
- dst->pointer.raw_data = d;
- s = src->pointer.str;
- for (i = 0; i < nval; i++) {
- d[i] = kstrdup(s[i], GFP_KERNEL);
- if (!d[i] && s[i])
- return -ENOMEM;
- }
+ error = property_copy_string_array(dst, src);
+ if (error)
+ goto out_free_name;
} else {
dst->pointer.raw_data = kmemdup(src->pointer.raw_data,
src->length, GFP_KERNEL);
- if (!dst->pointer.raw_data)
- return -ENOMEM;
+ if (!dst->pointer.raw_data) {
+ error = -ENOMEM;
+ goto out_free_name;
+ }
}
} else if (src->is_string) {
dst->value.str = kstrdup(src->value.str, GFP_KERNEL);
- if (!dst->value.str && src->value.str)
- return -ENOMEM;
+ if (!dst->value.str && src->value.str) {
+ error = -ENOMEM;
+ goto out_free_name;
+ }
} else {
dst->value.raw_data = src->value.raw_data;
}
@@ -762,6 +749,95 @@ static int pset_copy_entry(struct property_entry *dst,
dst->is_string = src->is_string;
return 0;
+
+out_free_name:
+ kfree(dst->name);
+ return error;
+}
+
+static void property_entry_free_data(const struct property_entry *p)
+{
+ size_t i, nval;
+
+ if (p->is_array) {
+ if (p->is_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(p->value.str);
+ }
+ kfree(p->name);
+}
+
+/**
+ * property_entries_dup - duplicate array of properties
+ * @properties: array of properties to copy
+ *
+ * This function creates a deep copy of the given NULL-terminated array
+ * of property entries.
+ */
+struct property_entry *
+property_entries_dup(const struct property_entry *properties)
+{
+ struct property_entry *p;
+ int i, n = 0;
+
+ while (properties[n].name)
+ n++;
+
+ p = kcalloc(n + 1, sizeof(*p), GFP_KERNEL);
+ if (!p)
+ return ERR_PTR(-ENOMEM);
+
+ for (i = 0; i < n; i++) {
+ int ret = property_entry_copy_data(&p[i], &properties[i]);
+ if (ret) {
+ while (--i >= 0)
+ property_entry_free_data(&p[i]);
+ kfree(p);
+ return ERR_PTR(ret);
+ }
+ }
+
+ return p;
+}
+EXPORT_SYMBOL_GPL(property_entries_dup);
+
+/**
+ * property_entries_free - free previously allocated array of properties
+ * @properties: array of properties to destroy
+ *
+ * This function frees given NULL-terminated array of property entries,
+ * along with their data.
+ */
+void property_entries_free(const struct property_entry *properties)
+{
+ const struct property_entry *p;
+
+ for (p = properties; p->name; p++)
+ property_entry_free_data(p);
+
+ kfree(properties);
+}
+EXPORT_SYMBOL_GPL(property_entries_free);
+
+/**
+ * pset_free_set - releases memory allocated for copied property set
+ * @pset: Property set to release
+ *
+ * Function takes previously copied property set and releases all the
+ * memory allocated to it.
+ */
+static void pset_free_set(struct property_set *pset)
+{
+ if (!pset)
+ return;
+
+ property_entries_free(pset->properties);
+ kfree(pset);
}
/**
@@ -776,32 +852,20 @@ static int pset_copy_entry(struct property_entry *dst,
*/
static struct property_set *pset_copy_set(const struct property_set *pset)
{
- struct property_entry *props;
+ struct property_entry *properties;
struct property_set *p;
- size_t i, n = 0;
p = kzalloc(sizeof(*p), GFP_KERNEL);
if (!p)
return ERR_PTR(-ENOMEM);
- while (pset->properties[n].name)
- n++;
-
- p->properties = props = kcalloc(n + 1, sizeof(*props), GFP_KERNEL);
- if (!p->properties) {
+ properties = property_entries_dup(pset->properties);
+ if (IS_ERR(properties)) {
kfree(p);
- return ERR_PTR(-ENOMEM);
- }
-
- for (i = 0; i < n; i++) {
- int ret = pset_copy_entry(&props[i],
- &pset->properties[i]);
- if (ret) {
- pset_free_set(p);
- return ERR_PTR(ret);
- }
+ return ERR_CAST(properties);
}
+ p->properties = properties;
return p;
}
diff --git a/include/linux/property.h b/include/linux/property.h
index 7a0a1cce5165..64e3a9c6d95f 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -241,6 +241,11 @@ struct property_entry {
.name = _name_, \
}
+struct property_entry *
+property_entries_dup(const struct property_entry *properties);
+
+void property_entries_free(const struct property_entry *properties);
+
int device_add_properties(struct device *dev,
const struct property_entry *properties);
void device_remove_properties(struct device *dev);
--
2.11.0.483.g087da7b7c-goog
--
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