[PATCH] selftests: ALSA: Skip tests when devices are unavailable

[Alireza Feyzabadi Farahani <arfa79lg@gmail.com>]

A kernel built without CONFIG_SND exposes no ALSA devices. In that
environment, the mixer and PCM tests currently report success with a
zero-test plan, while the userspace timer tests fail when opening
/dev/snd/timer. Neither result accurately describes an unsupported test
environment.

Report KSFT_SKIP when no sound cards are detected and when the timer
device is unavailable. Keep the PCM missing-card failures when a matching
hardware configuration says that a card should exist, and continue to
fail timer opens for unexpected errors.

Closes: https://bugzilla.kernel.org/show_bug.cgi?id=218479
Signed-off-by: Alireza Feyzabadi Farahani <arfa79lg@gmail.com>
---
 tools/testing/selftests/alsa/mixer-test.c  | 2 ++
 tools/testing/selftests/alsa/pcm-test.c    | 2 ++
 tools/testing/selftests/alsa/utimer-test.c | 6 ++++++
 3 files changed, 10 insertions(+)

diff --git a/tools/testing/selftests/alsa/mixer-test.c b/tools/testing/selftests/alsa/mixer-test.c
index 6edffcd6f..ab70645d5 100644
--- a/tools/testing/selftests/alsa/mixer-test.c
+++ b/tools/testing/selftests/alsa/mixer-test.c
@@ -1378,6 +1378,8 @@ int main(void)
 	ksft_print_header();
 
 	find_controls();
+	if (!card_list)
+		ksft_exit_skip("No sound cards detected\n");
 
 	ksft_set_plan(num_controls * TESTS_PER_CONTROL);
 
diff --git a/tools/testing/selftests/alsa/pcm-test.c b/tools/testing/selftests/alsa/pcm-test.c
index ee04ccef7..de07de650 100644
--- a/tools/testing/selftests/alsa/pcm-test.c
+++ b/tools/testing/selftests/alsa/pcm-test.c
@@ -613,6 +613,8 @@ int main(void)
 	conf_load();
 
 	find_pcms();
+	if (!card_list && !conf_cards)
+		ksft_exit_skip("No sound cards detected\n");
 
 	for (conf = conf_cards; conf; conf = conf->next)
 		if (conf->card < 0)
diff --git a/tools/testing/selftests/alsa/utimer-test.c b/tools/testing/selftests/alsa/utimer-test.c
index 1a9ff010c..07aeaa777 100644
--- a/tools/testing/selftests/alsa/utimer-test.c
+++ b/tools/testing/selftests/alsa/utimer-test.c
@@ -51,6 +51,9 @@ FIXTURE_SETUP(timer_f) {
 	self->utimer_info->resolution = (NANO / FRAME_RATE * PERIOD_SIZE);
 
 	timer_dev_fd = open("/dev/snd/timer", O_RDONLY);
+	if (timer_dev_fd < 0 &&
+	    (errno == ENOENT || errno == ENODEV || errno == ENXIO))
+		SKIP(return, "ALSA timer device unavailable");
 	ASSERT_GE(timer_dev_fd, 0);
 
 	if (ioctl(timer_dev_fd, SNDRV_TIMER_IOCTL_CREATE, self->utimer_info) < 0) {
@@ -156,6 +159,9 @@ TEST(wrong_timers_test) {
 	};
 
 	timer_dev_fd = open("/dev/snd/timer", O_RDONLY);
+	if (timer_dev_fd < 0 &&
+	    (errno == ENOENT || errno == ENODEV || errno == ENXIO))
+		SKIP(return, "ALSA timer device unavailable");
 	ASSERT_GE(timer_dev_fd, 0);
 
 	utimer_fd = ioctl(timer_dev_fd, SNDRV_TIMER_IOCTL_CREATE, &wrong_timer);
-- 
2.34.1