kunit: prevent log overwrite in param_tests

When running parameterized tests, each test case is initialized with
kunit_init_test(). This function takes the test_case->log as a parameter
but it clears it via string_stream_clear() on each iteration.

This results in only the log from the last parameter being preserved in
the test_case->log and the results from the previous parameters are lost
from the debugfs entry.

Fix this by manually setting the param_test.log to the test_case->log
after it has been initialized. This prevents kunit_init_test() from
clearing the log on each iteration.

Link: https://lore.kernel.org/r/[email protected]
Fixes: 4b59300 ("kunit: Add parent kunit for parameterized test context")
Signed-off-by: Carlos Llamas <[email protected]>
Reviewed-by: David Gow <[email protected]>
Signed-off-by: Shuah Khan <[email protected]>

Author: Carlos Llamas

lib/kunit/test.c

@@ -745,7 +745,8 @@ int kunit_run_tests(struct kunit_suite *suite)
 					.param_index = ++test.param_index,
 					.parent = &test,
 				};
-				kunit_init_test(&param_test, test_case->name, test_case->log);
+				kunit_init_test(&param_test, test_case->name, NULL);
+				param_test.log = test_case->log;
 				kunit_run_case_catch_errors(suite, test_case, &param_test);
 
 				if (param_desc[0] == '\0') {