As mentined by Takashi Sakamoto, the system-wide alsa-lib configuration may override the standard device declarations. This patch use the private alsa-lib configuration to set the predictable environment.

Cc: Mark Brown broonie@kernel.org Cc: Shuah Khan shuah@kernel.org Cc: Takashi Sakamoto o-takashi@sakamocchi.jp Cc: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com Cc: linux-kselftest@vger.kernel.org Link: https://lore.kernel.org/alsa-devel/Ya7TAHdMe9i41bsC@workstation/ Signed-off-by: Jaroslav Kysela perex@perex.cz --- tools/testing/selftests/alsa/mixer-test.c | 50 ++++++++++++++++++++++- 1 file changed, 49 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/alsa/mixer-test.c b/tools/testing/selftests/alsa/mixer-test.c index b87475fb7372..0f533707484c 100644 --- a/tools/testing/selftests/alsa/mixer-test.c +++ b/tools/testing/selftests/alsa/mixer-test.c @@ -46,22 +46,68 @@ struct ctl_data { struct ctl_data *next; };

+static const char *alsa_config = +"ctl.hw {\n" +" @args [ CARD ]\n" +" @args.CARD.type string\n" +" type hw\n" +" card $CARD\n" +"}\n" +; + int num_cards = 0; int num_controls = 0; struct card_data *card_list = NULL; struct ctl_data *ctl_list = NULL;

+#if !defined(SND_LIB_VER) || SND_LIB_VERSION < SND_LIB_VER(1, 2, 6) +int snd_config_load_string(snd_config_t **config, const char *s, size_t size) +{ + snd_input_t *input; + snd_config_t *dst; + int err; + + assert(config && s); + if (size == 0) + size = strlen(s); + err = snd_input_buffer_open(&input, s, size); + if (err < 0) + return err; + err = snd_config_top(&dst); + if (err < 0) { + snd_input_close(input); + return err; + } + err = snd_config_load(dst, input); + snd_input_close(input); + if (err < 0) { + snd_config_delete(dst); + return err; + } + *config = dst; + return 0; +} +#endif + void find_controls(void) { char name[32]; int card, ctl, err; struct card_data *card_data; struct ctl_data *ctl_data; + snd_config_t *config;

card = -1; if (snd_card_next(&card) < 0 || card < 0) return;

+ err = snd_config_load_string(&config, alsa_config, strlen(alsa_config)); + if (err < 0) { + ksft_print_msg("Unable to parse custom alsa-lib configuration: %s\n", + snd_strerror(err)); + ksft_exit_fail(); + } + while (card >= 0) { sprintf(name, "hw:%d", card);

@@ -71,7 +117,7 @@ void find_controls(void) ksft_exit_fail(); }

- err = snd_ctl_open(&card_data->handle, name, 0); + err = snd_ctl_open_lconf(&card_data->handle, name, 0, config); if (err < 0) { ksft_print_msg("Failed to get hctl for card %d: %s\n", card, snd_strerror(err)); @@ -147,6 +193,8 @@ void find_controls(void) break; } } + + snd_config_delete(config); }

/*