[PATCH 21/23] selftests: revocable: Add test case for DEFINE_REVOCABLE()

[Tzung-Bi Shih]

Add selftest case to verify DEFINE_REVOCABLE() can successfully access
the resource.

Signed-off-by: Tzung-Bi Shih <tzungbi@xxxxxxxxxx>
---
 .../drivers/base/revocable/revocable_test.c   | 12 ++++++
 .../revocable/test_modules/revocable_test.c   | 37 +++++++++++++++----
 2 files changed, 42 insertions(+), 7 deletions(-)

diff --git a/tools/testing/selftests/drivers/base/revocable/revocable_test.c b/tools/testing/selftests/drivers/base/revocable/revocable_test.c
index f024164e9273..723e5ea9ec84 100644
--- a/tools/testing/selftests/drivers/base/revocable/revocable_test.c
+++ b/tools/testing/selftests/drivers/base/revocable/revocable_test.c
@@ -14,6 +14,9 @@
  *
  * - Try Access Macro: Same as "Revocation" but uses the
  *   REVOCABLE_TRY_ACCESS_WITH() and REVOCABLE_TRY_ACCESS_SCOPED().
+ *
+ * - Define Macro: Verifies DEFINE_REVOCABLE() can successfully access the
+ *   resource.
  */
 
 #include <fcntl.h>
@@ -26,6 +29,7 @@
 #define TEST_DATA "12345678"
 #define TEST_MAGIC_OFFSET 0x1234
 #define TEST_MAGIC_OFFSET2 0x5678
+#define TEST_MAGIC_OFFSET3 0x9abc
 
 FIXTURE(revocable_fixture) {
 	int pfd;
@@ -133,4 +137,12 @@ TEST_F(revocable_fixture, try_access_macro2) {
 	EXPECT_STREQ("(null)", data);
 }
 
+TEST_F(revocable_fixture, define_macro) {
+	char data[16];
+
+	READ_TEST_DATA(self->cfd, TEST_MAGIC_OFFSET3, data,
+		       "failed to read test data");
+	EXPECT_STREQ(TEST_DATA, data);
+}
+
 TEST_HARNESS_MAIN
diff --git a/tools/testing/selftests/drivers/base/revocable/test_modules/revocable_test.c b/tools/testing/selftests/drivers/base/revocable/test_modules/revocable_test.c
index 1b0692eb75f3..d3bd0ce3a645 100644
--- a/tools/testing/selftests/drivers/base/revocable/test_modules/revocable_test.c
+++ b/tools/testing/selftests/drivers/base/revocable/test_modules/revocable_test.c
@@ -13,6 +13,7 @@
 #define TEST_CMD_RESOURCE_GONE "resource_gone"
 #define TEST_MAGIC_OFFSET 0x1234
 #define TEST_MAGIC_OFFSET2 0x5678
+#define TEST_MAGIC_OFFSET3 0x9abc
 
 static struct dentry *debugfs_dir;
 
@@ -22,15 +23,27 @@ struct revocable_test_provider_priv {
 	char res[16];
 };
 
+struct revocable_test_consumer_priv {
+	struct revocable_provider *rp;
+	struct revocable *rev;
+};
+
 static int revocable_test_consumer_open(struct inode *inode, struct file *filp)
 {
-	struct revocable *rev;
 	struct revocable_provider *rp = inode->i_private;
+	struct revocable_test_consumer_priv *priv;
 
-	rev = revocable_alloc(rp);
-	if (!rev)
+	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+	if (!priv)
 		return -ENOMEM;
-	filp->private_data = rev;
+
+	priv->rp = rp;
+	priv->rev = revocable_alloc(rp);
+	if (!priv->rev) {
+		kfree(priv);
+		return -ENOMEM;
+	}
+	filp->private_data = priv;
 
 	return 0;
 }
@@ -38,9 +51,10 @@ static int revocable_test_consumer_open(struct inode *inode, struct file *filp)
 static int revocable_test_consumer_release(struct inode *inode,
 					   struct file *filp)
 {
-	struct revocable *rev = filp->private_data;
+	struct revocable_test_consumer_priv *priv = filp->private_data;
 
-	revocable_free(rev);
+	revocable_free(priv->rev);
+	kfree(priv);
 	return 0;
 }
 
@@ -51,7 +65,8 @@ static ssize_t revocable_test_consumer_read(struct file *filp,
 	char *res;
 	char data[16];
 	size_t len;
-	struct revocable *rev = filp->private_data;
+	struct revocable_test_consumer_priv *priv = filp->private_data;
+	struct revocable *rev = priv->rev;
 
 	switch (*offset) {
 	case 0:
@@ -69,6 +84,14 @@ static ssize_t revocable_test_consumer_read(struct file *filp,
 		REVOCABLE_TRY_ACCESS_SCOPED(rev, res)
 			snprintf(data, sizeof(data), "%s", res ?: "(null)");
 		break;
+	case TEST_MAGIC_OFFSET3:
+		{
+			DEFINE_REVOCABLE(rev_on_stack, priv->rp);
+
+			REVOCABLE_TRY_ACCESS_WITH(rev_on_stack, res);
+			snprintf(data, sizeof(data), "%s", res ?: "(null)");
+		}
+		break;
 	default:
 		return 0;
 	}
-- 
2.52.0.457.g6b5491de43-goog