[PATCH v2 4/6] kselftest/alsa: mixer-test: Skip write verification for volatile controls

[Takashi Iwai <tiwai@xxxxxxx>]

The control elements with volatile flag don't guarantee that the
written values are actually saved for the next reads, hence we can't
verify the written values reliably.  Skip the verification after write
tests for those volatile controls for avoiding confusion.

Reported-by: Paul Menzel <pmenzel@xxxxxxxxxxxxx>
Closes: https://lore.kernel.org/r/1d44be36-9bb9-4d82-8953-5ae2a4f09405@xxxxxxxxxxxxx
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
---
 tools/testing/selftests/alsa/mixer-test.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/testing/selftests/alsa/mixer-test.c b/tools/testing/selftests/alsa/mixer-test.c
index 1c04e5f638a0..c98167818319 100644
--- a/tools/testing/selftests/alsa/mixer-test.c
+++ b/tools/testing/selftests/alsa/mixer-test.c
@@ -616,6 +616,10 @@ static int write_and_verify(struct ctl_data *ctl,
 	if (!snd_ctl_elem_info_is_readable(ctl->info))
 		return err;
 
+	/* Skip the verification for volatile controls, too */
+	if (snd_ctl_elem_info_is_volatile(ctl->info))
+		return err;
+
 	snd_ctl_elem_value_set_id(read_val, ctl->id);
 
 	err = snd_ctl_elem_read(ctl->card->handle, read_val);
-- 
2.43.0