device property: Take a copy of the property set

It is convenient if the property set associated with the device secondary
firmware node is a copy of the original. This allows passing property set
from a stack for example for devices created dynamically. This also ties
the property set lifetime to the associated device.

Because of that we provide new function device_remove_property_set() that
is used to disassociate and release memory allocated for the property set.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 173 insertions, 18 deletions

diff --git a/drivers/base/property.c b/drivers/base/property.c
index ebcbe342a77b..0b22c8a5b5db 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -19,24 +19,6 @@
 #include <linux/etherdevice.h>
 #include <linux/phy.h>
 
-/**
- * device_add_property_set - Add a collection of properties to a device object.
- * @dev: Device to add properties to.
- * @pset: Collection of properties to add.
- *
- * Associate a collection of device properties represented by @pset with @dev
- * as its secondary firmware node.
- */
-void device_add_property_set(struct device *dev, struct property_set *pset)
-{
-        if (!pset)
-                return;
-
-        pset->fwnode.type = FWNODE_PDATA;
-        set_secondary_fwnode(dev, &pset->fwnode);
-}
-EXPORT_SYMBOL_GPL(device_add_property_set);
-
 static inline bool is_pset_node(struct fwnode_handle *fwnode)
 {
         return fwnode && fwnode->type == FWNODE_PDATA;
@@ -693,6 +675,179 @@ out:
 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)
+{
+        const struct property_entry *prop;
+        size_t i, nval;
+
+        if (!pset)
+                return;
+
+        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);
+                }
+                kfree(prop->name);
+        }
+
+        kfree(pset->properties);
+        kfree(pset);
+}
+
+static int pset_copy_entry(struct property_entry *dst,
+                           const struct property_entry *src)
+{
+        const char **d, **s;
+        size_t i, nval;
+
+        dst->name = kstrdup(src->name, GFP_KERNEL);
+        if (!dst->name)
+                return -ENOMEM;
+
+        if (src->is_array) {
+                if (src->is_string) {
+                        nval = src->length / sizeof(const char *);
+                        dst->pointer.str = kcalloc(nval, sizeof(const char *),
+                                                   GFP_KERNEL);
+                        if (!dst->pointer.str)
+                                return -ENOMEM;
+
+                        d = dst->pointer.str;
+                        s = src->pointer.str;
+                        for (i = 0; i < nval; i++) {
+                                d[i] = kstrdup(s[i], GFP_KERNEL);
+                                if (!d[i] && s[i])
+                                        return -ENOMEM;
+                        }
+                } else {
+                        dst->pointer.raw_data = kmemdup(src->pointer.raw_data,
+                                                        src->length, GFP_KERNEL);
+                        if (!dst->pointer.raw_data)
+                                return -ENOMEM;
+                }
+        } else if (src->is_string) {
+                dst->value.str = kstrdup(src->value.str, GFP_KERNEL);
+                if (!dst->value.str && src->value.str)
+                        return -ENOMEM;
+        } else {
+                dst->value.raw_data = src->value.raw_data;
+        }
+
+        dst->length = src->length;
+        dst->is_array = src->is_array;
+        dst->is_string = src->is_string;
+
+        return 0;
+}
+
+/**
+ * pset_copy_set - copies property set
+ * @pset: Property set to copy
+ *
+ * This function takes a deep copy of the given property set and returns
+ * pointer to the copy. Call device_free_property_set() to free resources
+ * allocated in this function.
+ *
+ * Return: Pointer to the new property set or error pointer.
+ */
+static struct property_set *pset_copy_set(const struct property_set *pset)
+{
+        const struct property_entry *entry;
+        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 = kcalloc(n + 1, sizeof(*entry), GFP_KERNEL);
+        if (!p->properties) {
+                kfree(p);
+                return ERR_PTR(-ENOMEM);
+        }
+
+        for (i = 0; i < n; i++) {
+                int ret = pset_copy_entry(&p->properties[i],
+                                          &pset->properties[i]);
+                if (ret) {
+                        pset_free_set(p);
+                        return ERR_PTR(ret);
+                }
+        }
+
+        return p;
+}
+
+/**
+ * device_remove_property_set - Remove properties from a device object.
+ * @dev: Device whose properties to remove.
+ *
+ * The function removes properties previously associated to the device
+ * secondary firmware node with device_add_property_set(). Memory allocated
+ * to the properties will also be released.
+ */
+void device_remove_property_set(struct device *dev)
+{
+        struct fwnode_handle *fwnode;
+
+        fwnode = dev_fwnode(dev);
+        if (!fwnode)
+                return;
+        /*
+         * Pick either primary or secondary node depending which one holds
+         * the pset. If there is no real firmware node (ACPI/DT) primary
+         * will hold the pset.
+         */
+        if (!is_pset_node(fwnode))
+                fwnode = fwnode->secondary;
+        if (!IS_ERR(fwnode) && is_pset_node(fwnode))
+                pset_free_set(to_pset_node(fwnode));
+        set_secondary_fwnode(dev, NULL);
+}
+EXPORT_SYMBOL_GPL(device_remove_property_set);
+
+/**
+ * device_add_property_set - Add a collection of properties to a device object.
+ * @dev: Device to add properties to.
+ * @pset: Collection of properties to add.
+ *
+ * Associate a collection of device properties represented by @pset with @dev
+ * as its secondary firmware node. The function takes a copy of @pset.
+ */
+int device_add_property_set(struct device *dev, const struct property_set *pset)
+{
+        struct property_set *p;
+
+        if (!pset)
+                return -EINVAL;
+
+        p = pset_copy_set(pset);
+        if (IS_ERR(p))
+                return PTR_ERR(p);
+
+        p->fwnode.type = FWNODE_PDATA;
+        set_secondary_fwnode(dev, &p->fwnode);
+        return 0;
+}
+EXPORT_SYMBOL_GPL(device_add_property_set);
+
+/**
  * device_get_next_child_node - Return the next child node handle for a device
  * @dev: Device to find the next child node for.
  * @child: Handle to one of the device's child nodes or a null handle.