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authorPantelis Antoniou <pantelis.antoniou@konsulko.com>2014-07-04 19:58:47 +0300
committerMark Brown <broonie@kernel.org>2015-02-19 23:30:21 +0900
commita39492cbb90cebc0c1cb55d95e913848f6d68109 (patch)
tree3e0f9f5753bd33930758859564ab562e105ed315
parentd5ba7b3ca35a9cb01680fac0e249ad6e12b56389 (diff)
downloadlinux-linaro-stable-a39492cbb90cebc0c1cb55d95e913848f6d68109.tar.gz
OF: Utility helper functions for dynamic nodes
Introduce helper functions for working with the live DT tree, all of them related to dynamically adding/removing nodes and properties. __of_prop_dup() copies a property dynamically __of_node_alloc() creates an empty node Bug fix about prop->len == 0 by Ionut Nicu <ioan.nicu.ext@nsn.com> Signed-off-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com> [glikely: Added unittest for of_copy_property and dropped fine-grained allocations] [glikely: removed name, type and phandle arguments from __of_node_alloc] Signed-off-by: Grant Likely <grant.likely@linaro.org> (cherry picked from commit 698433963b98d6de7b102c242805c99fda4fa1fb) Signed-off-by: Mark Brown <broonie@kernel.org> Conflicts: drivers/of/of_private.h
-rw-r--r--drivers/of/dynamic.c77
-rw-r--r--drivers/of/selftest.c28
2 files changed, 105 insertions, 0 deletions
diff --git a/drivers/of/dynamic.c b/drivers/of/dynamic.c
index f298dc55368f..7bd5501736a6 100644
--- a/drivers/of/dynamic.c
+++ b/drivers/of/dynamic.c
@@ -237,3 +237,80 @@ void of_node_release(struct kobject *kobj)
kfree(node->data);
kfree(node);
}
+
+/**
+ * __of_prop_dup - Copy a property dynamically.
+ * @prop: Property to copy
+ * @allocflags: Allocation flags (typically pass GFP_KERNEL)
+ *
+ * Copy a property by dynamically allocating the memory of both the
+ * property stucture and the property name & contents. The property's
+ * flags have the OF_DYNAMIC bit set so that we can differentiate between
+ * dynamically allocated properties and not.
+ * Returns the newly allocated property or NULL on out of memory error.
+ */
+struct property *__of_prop_dup(const struct property *prop, gfp_t allocflags)
+{
+ struct property *new;
+
+ new = kzalloc(sizeof(*new), allocflags);
+ if (!new)
+ return NULL;
+
+ /*
+ * NOTE: There is no check for zero length value.
+ * In case of a boolean property This will allocate a value
+ * of zero bytes. We do this to work around the use
+ * of of_get_property() calls on boolean values.
+ */
+ new->name = kstrdup(prop->name, allocflags);
+ new->value = kmemdup(prop->value, prop->length, allocflags);
+ new->length = prop->length;
+ if (!new->name || !new->value)
+ goto err_free;
+
+ /* mark the property as dynamic */
+ of_property_set_flag(new, OF_DYNAMIC);
+
+ return new;
+
+ err_free:
+ kfree(new->name);
+ kfree(new->value);
+ kfree(new);
+ return NULL;
+}
+
+/**
+ * __of_node_alloc() - Create an empty device node dynamically.
+ * @full_name: Full name of the new device node
+ * @allocflags: Allocation flags (typically pass GFP_KERNEL)
+ *
+ * Create an empty device tree node, suitable for further modification.
+ * The node data are dynamically allocated and all the node flags
+ * have the OF_DYNAMIC & OF_DETACHED bits set.
+ * Returns the newly allocated node or NULL on out of memory error.
+ */
+struct device_node *__of_node_alloc(const char *full_name, gfp_t allocflags)
+{
+ struct device_node *node;
+
+ node = kzalloc(sizeof(*node), allocflags);
+ if (!node)
+ return NULL;
+
+ node->full_name = kstrdup(full_name, allocflags);
+ of_node_set_flag(node, OF_DYNAMIC);
+ of_node_set_flag(node, OF_DETACHED);
+ if (!node->full_name)
+ goto err_free;
+
+ of_node_init(node);
+
+ return node;
+
+ err_free:
+ kfree(node->full_name);
+ kfree(node);
+ return NULL;
+}
diff --git a/drivers/of/selftest.c b/drivers/of/selftest.c
index 077314eebb95..ee2166f0f36a 100644
--- a/drivers/of/selftest.c
+++ b/drivers/of/selftest.c
@@ -16,6 +16,8 @@
#include <linux/slab.h>
#include <linux/device.h>
+#include "of_private.h"
+
static struct selftest_results {
int passed;
int failed;
@@ -266,6 +268,31 @@ static void __init of_selftest_property_match_string(void)
selftest(rc == -EILSEQ, "unterminated string; rc=%i", rc);
}
+#define propcmp(p1, p2) (((p1)->length == (p2)->length) && \
+ (p1)->value && (p2)->value && \
+ !memcmp((p1)->value, (p2)->value, (p1)->length) && \
+ !strcmp((p1)->name, (p2)->name))
+static void __init of_selftest_property_copy(void)
+{
+#ifdef CONFIG_OF_DYNAMIC
+ struct property p1 = { .name = "p1", .length = 0, .value = "" };
+ struct property p2 = { .name = "p2", .length = 5, .value = "abcd" };
+ struct property *new;
+
+ new = __of_prop_dup(&p1, GFP_KERNEL);
+ selftest(new && propcmp(&p1, new), "empty property didn't copy correctly\n");
+ kfree(new->value);
+ kfree(new->name);
+ kfree(new);
+
+ new = __of_prop_dup(&p2, GFP_KERNEL);
+ selftest(new && propcmp(&p2, new), "non-empty property didn't copy correctly\n");
+ kfree(new->value);
+ kfree(new->name);
+ kfree(new);
+#endif
+}
+
static void __init of_selftest_parse_interrupts(void)
{
struct device_node *np;
@@ -533,6 +560,7 @@ static int __init of_selftest(void)
of_selftest_dynamic();
of_selftest_parse_phandle_with_args();
of_selftest_property_match_string();
+ of_selftest_property_copy();
of_selftest_parse_interrupts();
of_selftest_parse_interrupts_extended();
of_selftest_match_node();