mirror of https://gitee.com/openkylin/linux.git
device property: export code duplicating array of property entries
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@gmail.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Dmitry Torokhov
Rafael J. Wysocki
parent
9426998ce6
commit
2d479e1fa2
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@ -682,77 +682,64 @@ int fwnode_property_match_string(struct fwnode_handle *fwnode,
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}
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EXPORT_SYMBOL_GPL(fwnode_property_match_string);
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/**
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* pset_free_set - releases memory allocated for copied property set
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* @pset: Property set to release
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*
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* Function takes previously copied property set and releases all the
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* memory allocated to it.
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*/
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static void pset_free_set(struct property_set *pset)
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static int property_copy_string_array(struct property_entry *dst,
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const struct property_entry *src)
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{
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const struct property_entry *prop;
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size_t i, nval;
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char **d;
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size_t nval = src->length / sizeof(*d);
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int i;
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if (!pset)
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return;
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d = kcalloc(nval, sizeof(*d), GFP_KERNEL);
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if (!d)
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return -ENOMEM;
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for (prop = pset->properties; prop->name; prop++) {
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if (prop->is_array) {
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if (prop->is_string && prop->pointer.str) {
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nval = prop->length / sizeof(const char *);
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for (i = 0; i < nval; i++)
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kfree(prop->pointer.str[i]);
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}
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kfree(prop->pointer.raw_data);
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} else if (prop->is_string) {
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kfree(prop->value.str);
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for (i = 0; i < nval; i++) {
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d[i] = kstrdup(src->pointer.str[i], GFP_KERNEL);
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if (!d[i] && src->pointer.str[i]) {
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while (--i >= 0)
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kfree(d[i]);
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kfree(d);
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return -ENOMEM;
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}
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kfree(prop->name);
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}
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kfree(pset->properties);
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kfree(pset);
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dst->pointer.raw_data = d;
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return 0;
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}
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static int pset_copy_entry(struct property_entry *dst,
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const struct property_entry *src)
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static int property_entry_copy_data(struct property_entry *dst,
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const struct property_entry *src)
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{
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const char * const *s;
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char **d;
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size_t i, nval;
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int error;
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dst->name = kstrdup(src->name, GFP_KERNEL);
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if (!dst->name)
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return -ENOMEM;
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if (src->is_array) {
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if (!src->length)
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return -ENODATA;
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if (!src->length) {
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error = -ENODATA;
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goto out_free_name;
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}
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if (src->is_string) {
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nval = src->length / sizeof(const char *);
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d = kcalloc(nval, sizeof(const char *), GFP_KERNEL);
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if (!d)
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return -ENOMEM;
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dst->pointer.raw_data = d;
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s = src->pointer.str;
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for (i = 0; i < nval; i++) {
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d[i] = kstrdup(s[i], GFP_KERNEL);
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if (!d[i] && s[i])
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return -ENOMEM;
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}
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error = property_copy_string_array(dst, src);
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if (error)
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goto out_free_name;
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} else {
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dst->pointer.raw_data = kmemdup(src->pointer.raw_data,
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src->length, GFP_KERNEL);
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if (!dst->pointer.raw_data)
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return -ENOMEM;
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if (!dst->pointer.raw_data) {
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error = -ENOMEM;
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goto out_free_name;
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}
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}
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} else if (src->is_string) {
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dst->value.str = kstrdup(src->value.str, GFP_KERNEL);
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if (!dst->value.str && src->value.str)
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return -ENOMEM;
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if (!dst->value.str && src->value.str) {
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error = -ENOMEM;
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goto out_free_name;
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}
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} else {
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dst->value.raw_data = src->value.raw_data;
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}
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@ -762,6 +749,95 @@ static int pset_copy_entry(struct property_entry *dst,
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dst->is_string = src->is_string;
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return 0;
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out_free_name:
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kfree(dst->name);
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return error;
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}
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static void property_entry_free_data(const struct property_entry *p)
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{
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size_t i, nval;
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if (p->is_array) {
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if (p->is_string && p->pointer.str) {
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nval = p->length / sizeof(const char *);
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for (i = 0; i < nval; i++)
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kfree(p->pointer.str[i]);
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}
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kfree(p->pointer.raw_data);
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} else if (p->is_string) {
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kfree(p->value.str);
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}
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kfree(p->name);
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}
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/**
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* property_entries_dup - duplicate array of properties
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* @properties: array of properties to copy
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*
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* This function creates a deep copy of the given NULL-terminated array
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* of property entries.
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*/
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struct property_entry *
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property_entries_dup(const struct property_entry *properties)
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{
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struct property_entry *p;
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int i, n = 0;
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while (properties[n].name)
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n++;
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p = kcalloc(n + 1, sizeof(*p), GFP_KERNEL);
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if (!p)
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return ERR_PTR(-ENOMEM);
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for (i = 0; i < n; i++) {
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int ret = property_entry_copy_data(&p[i], &properties[i]);
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if (ret) {
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while (--i >= 0)
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property_entry_free_data(&p[i]);
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kfree(p);
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return ERR_PTR(ret);
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}
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}
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return p;
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}
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EXPORT_SYMBOL_GPL(property_entries_dup);
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/**
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* property_entries_free - free previously allocated array of properties
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* @properties: array of properties to destroy
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*
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* This function frees given NULL-terminated array of property entries,
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* along with their data.
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*/
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void property_entries_free(const struct property_entry *properties)
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{
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const struct property_entry *p;
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for (p = properties; p->name; p++)
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property_entry_free_data(p);
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kfree(properties);
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}
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EXPORT_SYMBOL_GPL(property_entries_free);
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/**
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* pset_free_set - releases memory allocated for copied property set
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* @pset: Property set to release
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*
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* Function takes previously copied property set and releases all the
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* memory allocated to it.
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*/
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static void pset_free_set(struct property_set *pset)
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{
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if (!pset)
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return;
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property_entries_free(pset->properties);
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kfree(pset);
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}
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/**
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@ -776,32 +852,20 @@ static int pset_copy_entry(struct property_entry *dst,
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*/
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static struct property_set *pset_copy_set(const struct property_set *pset)
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{
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struct property_entry *props;
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struct property_entry *properties;
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struct property_set *p;
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size_t i, n = 0;
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p = kzalloc(sizeof(*p), GFP_KERNEL);
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if (!p)
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return ERR_PTR(-ENOMEM);
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while (pset->properties[n].name)
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n++;
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p->properties = props = kcalloc(n + 1, sizeof(*props), GFP_KERNEL);
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if (!p->properties) {
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properties = property_entries_dup(pset->properties);
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if (IS_ERR(properties)) {
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kfree(p);
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return ERR_PTR(-ENOMEM);
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}
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for (i = 0; i < n; i++) {
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int ret = pset_copy_entry(&props[i],
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&pset->properties[i]);
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if (ret) {
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pset_free_set(p);
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return ERR_PTR(ret);
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}
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return ERR_CAST(properties);
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}
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p->properties = properties;
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return p;
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}
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@ -241,6 +241,11 @@ struct property_entry {
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.name = _name_, \
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}
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struct property_entry *
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property_entries_dup(const struct property_entry *properties);
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void property_entries_free(const struct property_entry *properties);
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int device_add_properties(struct device *dev,
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const struct property_entry *properties);
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void device_remove_properties(struct device *dev);
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