[igt-dev] [PATCH i-g-t 08/17] lib/kunit: Cancel KTP parser on module load failure

[Janusz Krzysztofik]

For our KTAP parser to be running in parallel with kunit test module
loading, we now start it in a separate thread before we load the module.
If the module loading fails then we join the KTAP parser thread right
after that failure.  If the KTAP thread sleeps for some reason then we
can fail to break the test immediately.

Cancel the KTAP parser thread right after module load error and before
joining it.

Signed-off-by: Janusz Krzysztofik <janusz.krzysztofik at linux.intel.com>
---
 lib/igt_kmod.c | 1 +
 lib/igt_ktap.c | 6 ++++++
 lib/igt_ktap.h | 1 +
 3 files changed, 8 insertions(+)

diff --git a/lib/igt_kmod.c b/lib/igt_kmod.c
index 78b8eb8f53..fb0bd21ee5 100644
--- a/lib/igt_kmod.c
+++ b/lib/igt_kmod.c
@@ -773,6 +773,7 @@ static void __igt_kunit(struct igt_ktest *tst, const char *opts)
 	results = ktap_parser_start(tst->kmsg, is_builtin);
 
 	if (igt_debug_on(igt_kmod_load(tst->module_name, opts) < 0)) {
+		ktap_parser_cancel();
 		igt_ignore_warn(ktap_parser_stop());
 		igt_skip("Unable to load %s module\n", tst->module_name);
 	}
diff --git a/lib/igt_ktap.c b/lib/igt_ktap.c
index 3cfb55ec97..1e75b2ec23 100644
--- a/lib/igt_ktap.c
+++ b/lib/igt_ktap.c
@@ -602,6 +602,12 @@ struct ktap_test_results *ktap_parser_start(int fd, bool is_builtin)
 	return &results;
 }
 
+void ktap_parser_cancel(void)
+{
+	ktap_args.is_running = false;
+	pthread_cancel(ktap_parser_thread);
+}
+
 int ktap_parser_stop(void)
 {
 	ktap_args.is_running = false;
diff --git a/lib/igt_ktap.h b/lib/igt_ktap.h
index ea57c2bb9b..991800e912 100644
--- a/lib/igt_ktap.h
+++ b/lib/igt_ktap.h
@@ -45,6 +45,7 @@ struct ktap_test_results {
 
 
 struct ktap_test_results *ktap_parser_start(int fd, bool is_builtin);
+void ktap_parser_cancel(void);
 int ktap_parser_stop(void);
 
 #endif /* IGT_KTAP_H */
-- 
2.41.0