of/selftest: Add self tests for manipulation of properties

Adds a few simple test cases to ensure that addition, update and removal
of device tree node properties works correctly.

Signed-off-by: Grant Likely <grant.likely@linaro.org>
Cc: Rob Herring <rob.herring@calxeda.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: David S. Miller <davem@davemloft.net>
Cc: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Cc: Pantelis Antoniou <panto@antoniou-consulting.com>

1 files changed, 62 insertions, 0 deletions

diff --git a/drivers/of/selftest.c b/drivers/of/selftest.c
index 6643d1920985..ae4450070503 100644
--- a/drivers/of/selftest.c
+++ b/drivers/of/selftest.c
@@ -30,6 +30,67 @@ static struct selftest_results {
         } \
 }
 
+static void __init of_selftest_dynamic(void)
+{
+        struct device_node *np;
+        struct property *prop;
+
+        np = of_find_node_by_path("/testcase-data");
+        if (!np) {
+                pr_err("missing testcase data\n");
+                return;
+        }
+
+        /* Array of 4 properties for the purpose of testing */
+        prop = kzalloc(sizeof(*prop) * 4, GFP_KERNEL);
+        if (!prop) {
+                selftest(0, "kzalloc() failed\n");
+                return;
+        }
+
+        /* Add a new property - should pass*/
+        prop->name = "new-property";
+        prop->value = "new-property-data";
+        prop->length = strlen(prop->value);
+        selftest(of_add_property(np, prop) == 0, "Adding a new property failed\n");
+
+        /* Try to add an existing property - should fail */
+        prop++;
+        prop->name = "new-property";
+        prop->value = "new-property-data-should-fail";
+        prop->length = strlen(prop->value);
+        selftest(of_add_property(np, prop) != 0,
+                 "Adding an existing property should have failed\n");
+
+        /* Try to modify an existing property - should pass */
+        prop->value = "modify-property-data-should-pass";
+        prop->length = strlen(prop->value);
+        selftest(of_update_property(np, prop) == 0,
+                 "Updating an existing property should have passed\n");
+
+        /* Try to modify non-existent property - should pass*/
+        prop++;
+        prop->name = "modify-property";
+        prop->value = "modify-missing-property-data-should-pass";
+        prop->length = strlen(prop->value);
+        selftest(of_update_property(np, prop) == 0,
+                 "Updating a missing property should have passed\n");
+
+        /* Remove property - should pass */
+        selftest(of_remove_property(np, prop) == 0,
+                 "Removing a property should have passed\n");
+
+        /* Adding very large property - should pass */
+        prop++;
+        prop->name = "large-property-PAGE_SIZEx8";
+        prop->length = PAGE_SIZE * 8;
+        prop->value = kzalloc(prop->length, GFP_KERNEL);
+        selftest(prop->value != NULL, "Unable to allocate large buffer\n");
+        if (prop->value)
+                selftest(of_add_property(np, prop) == 0,
+                         "Adding a large property should have passed\n");
+}
+
 static void __init of_selftest_parse_phandle_with_args(void)
 {
         struct device_node *np;
@@ -378,6 +439,7 @@ static int __init of_selftest(void)
         of_node_put(np);
 
         pr_info("start of selftest - you will see error messages\n");
+        of_selftest_dynamic();
         of_selftest_parse_phandle_with_args();
         of_selftest_property_match_string();
         of_selftest_parse_interrupts();