Re: [PATCH] kselftest: alsa: Add simplistic test for ALSA mixer controls kselftest

On Fri, 03 Dec 2021 20:33:11 +0100, Mark Brown wrote:

Add a basic test for the mixer control interface. For every control on every sound card in the system it checks that it can read and write the default value where the control supports that and for writeable controls attempts to write all valid values, restoring the default values after each test to minimise disruption for users.

There are quite a few areas for improvement - currently no coverage of the generation of notifications, several of the control types don't have any coverage for the values and we don't have any testing of error handling when we attempt to write out of range values - but this provides some basic coverage.

This is added as a kselftest since unlike other ALSA test programs it does not require either physical setup of the device or interactive monitoring by users and kselftest is one of the test suites that is frequently run by people doing general automated testing so should increase coverage. It is written in terms of alsa-lib since tinyalsa is not generally packaged for distributions which makes things harder for general users interested in kselftest as a whole but it will be a barrier to people with Android.

Signed-off-by: Mark Brown broonie@kernel.org

Thanks for the patch! That's one of my long-standing TODO, and you solved it :)

Through a quick glance, the code looks fine. But a general question is how to deal with the external library setup for kselftest. Ideally speaking, the include and the library paths should be managed via pkgconfig, but it'll make things a bit more complicated, of course. And what if the system has no libasound? Will we make it mandatory?

Takashi

---

MAINTAINERS | 7 + tools/testing/selftests/Makefile | 3 +- tools/testing/selftests/alsa/.gitignore | 1 + tools/testing/selftests/alsa/Makefile | 8 + tools/testing/selftests/alsa/mixer-test.c | 616 ++++++++++++++++++++++ 5 files changed, 634 insertions(+), 1 deletion(-) create mode 100644 tools/testing/selftests/alsa/.gitignore create mode 100644 tools/testing/selftests/alsa/Makefile create mode 100644 tools/testing/selftests/alsa/mixer-test.c

diff --git a/MAINTAINERS b/MAINTAINERS index 5b1e79f8e3d8..92deb9a83b8c 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -17934,6 +17934,7 @@ F: Documentation/sound/ F: include/sound/ F: include/uapi/sound/ F: sound/ +F: tools/testing/selftests/alsa SOUND - COMPRESSED AUDIO M: Vinod Koul vkoul@kernel.org @@ -17953,6 +17954,12 @@ F: include/sound/dmaengine_pcm.h F: sound/core/pcm_dmaengine.c F: sound/soc/soc-generic-dmaengine-pcm.c +SOUND - ALSA SELFTESTS +M: Mark Brown broonie@kernel.org +L: alsa-devel@alsa-project.org (moderated for non-subscribers) +S: Supported +F: tools/testing/selftests/alsa

SOUND - SOC LAYER / DYNAMIC AUDIO POWER MANAGEMENT (ASoC) M: Liam Girdwood lgirdwood@gmail.com M: Mark Brown broonie@kernel.org diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile index c852eb40c4f7..d08fe4cfe811 100644 --- a/tools/testing/selftests/Makefile +++ b/tools/testing/selftests/Makefile @@ -1,5 +1,6 @@ # SPDX-License-Identifier: GPL-2.0 -TARGETS = arm64 +TARGETS += alsa +TARGETS += arm64 TARGETS += bpf TARGETS += breakpoints TARGETS += capabilities diff --git a/tools/testing/selftests/alsa/.gitignore b/tools/testing/selftests/alsa/.gitignore new file mode 100644 index 000000000000..3bb7c41266a8 --- /dev/null +++ b/tools/testing/selftests/alsa/.gitignore @@ -0,0 +1 @@ +mixer-test diff --git a/tools/testing/selftests/alsa/Makefile b/tools/testing/selftests/alsa/Makefile new file mode 100644 index 000000000000..e62f227ce02c --- /dev/null +++ b/tools/testing/selftests/alsa/Makefile @@ -0,0 +1,8 @@ +# SPDX-License-Identifier: GPL-2.0 +#

+LDLIBS += -lasound

+TEST_GEN_PROGS := mixer-test

+include ../lib.mk diff --git a/tools/testing/selftests/alsa/mixer-test.c b/tools/testing/selftests/alsa/mixer-test.c new file mode 100644 index 000000000000..6082efa0b426 --- /dev/null +++ b/tools/testing/selftests/alsa/mixer-test.c @@ -0,0 +1,616 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// kselftest for the ALSA mixer API +// +// Original author: Mark Brown broonie@kernel.org +// Copyright (c) 2021 Arm Limited

+// This test will iterate over all cards detected in the system, exercising +// every mixer control it can find. This may conflict with other system +// software if there is audio activity so is best run on a system with a +// minimal active userspace.

+#include <stdio.h> +#include <stdlib.h> +#include <stdbool.h> +#include <string.h> +#include <getopt.h> +#include <stdarg.h> +#include <ctype.h> +#include <math.h> +#include <errno.h> +#include <assert.h> +#include <alsa/asoundlib.h> +#include <poll.h> +#include <stdint.h>

+#include "../kselftest.h"

+#define TESTS_PER_CONTROL 3

+struct card_data {

• snd_ctl_t *handle;
• int card;
• int num_ctls;
• snd_ctl_elem_list_t *ctls;
• struct card_data *next;

+};

+struct ctl_data {

• const char *name;
• snd_ctl_elem_id_t *id;
• snd_ctl_elem_info_t *info;
• snd_ctl_elem_value_t *def_val;
• int elem;
• struct card_data *card;
• struct ctl_data *next;

+};

+int num_cards = 0; +int num_controls = 0; +struct card_data *card_list = NULL; +struct ctl_data *ctl_list = NULL;

+void find_controls(void) +{

• char name[32];
• int card, ctl, err;
• struct card_data *card_data;
• struct ctl_data *ctl_data;
• card = -1;
• if (snd_card_next(&card) < 0 || card < 0)

• return;
  

• while (card >= 0) {

• sprintf(name, "hw:%d", card);
  

• card_data = malloc(sizeof(*card_data));
  

• if (!card_data) {
  

• 	ksft_print_msg("Out of memory\n");
  

• 	ksft_exit_fail();
  

• }
  

• err = snd_ctl_open(&card_data->handle, name, 0);
  

• if (err < 0) {
  

• 	ksft_print_msg("Failed to get hctl for card %d: %s\n",
  

• 		       card, snd_strerror(err));
  

• 	goto next_card;
  

• }
  

• /* Count controls */
  

• snd_ctl_elem_list_malloc(&card_data->ctls);
  

• snd_ctl_elem_list(card_data->handle, card_data->ctls);
  

• card_data->num_ctls = snd_ctl_elem_list_get_count(card_data->ctls);
  

• /* Enumerate control information */
  

• snd_ctl_elem_list_alloc_space(card_data->ctls, card_data->num_ctls);
  

• snd_ctl_elem_list(card_data->handle, card_data->ctls);
  

• card_data->card = num_cards++;
  

• card_data->next = card_list;
  

• card_list = card_data;
  

• num_controls += card_data->num_ctls;
  

• for (ctl = 0; ctl < card_data->num_ctls; ctl++) {
  

• 	ctl_data = malloc(sizeof(*ctl_data));
  

• 	if (!ctl_data) {
  

• 		ksft_print_msg("Out of memory\n");
  

• 		ksft_exit_fail();
  

• 	}
  

• 	ctl_data->card = card_data;
  

• 	ctl_data->elem = ctl;
  

• 	ctl_data->name = snd_ctl_elem_list_get_name(card_data->ctls,
  

• 						    ctl);
  

• 	err = snd_ctl_elem_id_malloc(&ctl_data->id);
  

• 	if (err < 0) {
  

• 		ksft_print_msg("Out of memory\n");
  

• 		ksft_exit_fail();
  

• 	}
  

• 	err = snd_ctl_elem_info_malloc(&ctl_data->info);
  

• 	if (err < 0) {
  

• 		ksft_print_msg("Out of memory\n");
  

• 		ksft_exit_fail();
  

• 	}
  

• 	err = snd_ctl_elem_value_malloc(&ctl_data->def_val);
  

• 	if (err < 0) {
  

• 		ksft_print_msg("Out of memory\n");
  

• 		ksft_exit_fail();
  

• 	}
  

• 	snd_ctl_elem_list_get_id(card_data->ctls, ctl,
  

• 				 ctl_data->id);
  

• 	snd_ctl_elem_info_set_id(ctl_data->info, ctl_data->id);
  

• 	err = snd_ctl_elem_info(card_data->handle,
  

• 				ctl_data->info);
  

• 	if (err < 0) {
  

• 		ksft_print_msg("%s getting info for %d\n",
  

• 			       snd_strerror(err),
  

• 			       ctl_data->name);
  

• 	}
  

• 	snd_ctl_elem_value_set_id(ctl_data->def_val,
  

• 				  ctl_data->id);
  

• 	ctl_data->next = ctl_list;
  

• 	ctl_list = ctl_data;
  

• }
  

• next_card:

• if (snd_card_next(&card) < 0) {
  

• 	ksft_print_msg("snd_card_next");
  

• 	break;
  

• }
  

• }

+}

+/*

• • Check that we can read the default value and it is valid. Write
• • tests use the read value to restore the default.
• */

+void test_ctl_get_value(struct ctl_data *ctl) +{

• int err;
• long int_val;
• long long int64_val;
• /* If the control is turned off let's be polite */
• if (snd_ctl_elem_info_is_inactive(ctl->info)) {

• ksft_print_msg("%s is inactive\n", ctl->name);
  

• ksft_test_result_skip("get_value.%d.%d\n",
  

• 		      ctl->card->card, ctl->elem);
  

• return;
  

• }
• /* Can't test reading on an unreadable control */
• if (!snd_ctl_elem_info_is_readable(ctl->info)) {

• ksft_print_msg("%s is not readable\n", ctl->name);
  

• ksft_test_result_skip("get_value.%d.%d\n",
  

• 		      ctl->card->card, ctl->elem);
  

• return;
  

• }
• err = snd_ctl_elem_read(ctl->card->handle, ctl->def_val);
• if (err < 0) {

• ksft_print_msg("snd_ctl_elem_read() failed: %s\n",
  

• 	       snd_strerror(err));
  

• goto out;
  

• }
• switch (snd_ctl_elem_info_get_type(ctl->info)) {
• case SND_CTL_ELEM_TYPE_NONE:

• ksft_print_msg("%s Invalid control type NONE\n", ctl->name);
  

• err = -1;
  

• break;
  

• case SND_CTL_ELEM_TYPE_BOOLEAN:

• int_val = snd_ctl_elem_value_get_boolean(ctl->def_val, 0);
  

• switch (int_val) {
  

• case 0:
  

• case 1:
  

• 	break;
  

• default:
  

• 	ksft_print_msg("%s Invalid boolean value %ld\n",
  

• 		       ctl->name, int_val);
  

• 	err = -1;
  

• 	break;
  

• }
  

• break;
  

• case SND_CTL_ELEM_TYPE_INTEGER:

• int_val = snd_ctl_elem_value_get_integer(ctl->def_val, 0);
  

• if (int_val < snd_ctl_elem_info_get_min(ctl->info)) {
  

• 	ksft_print_msg("%s value %ld less than minimum %ld\n",
  

• 		       ctl->name, int_val,
  

• 		       snd_ctl_elem_info_get_min(ctl->info));
  

• 	err = -1;
  

• }
  

• if (int_val > snd_ctl_elem_info_get_max(ctl->info)) {
  

• 	ksft_print_msg("%s value %ld more than maximum %ld\n",
  

• 		       ctl->name, int_val,
  

• 		       snd_ctl_elem_info_get_max(ctl->info));
  

• 	err = -1;
  

• }
  

• /* Only check step size if there is one and we're in bounds */
  

• if (err >= 0 && snd_ctl_elem_info_get_step(ctl->info) &&
  

•     (int_val - snd_ctl_elem_info_get_min(ctl->info) %
  

•      snd_ctl_elem_info_get_step(ctl->info))) {
  

• 	ksft_print_msg("%s value %ld invalid for step %ld minimum %ld\n",
  

• 		       ctl->name, int_val,
  

• 		       snd_ctl_elem_info_get_step(ctl->info),
  

• 		       snd_ctl_elem_info_get_min(ctl->info));
  

• 	err = -1;
  

• }
  

• break;
  

• case SND_CTL_ELEM_TYPE_INTEGER64:

• int64_val = snd_ctl_elem_value_get_integer64(ctl->def_val, 0);
  

• if (int64_val < snd_ctl_elem_info_get_min64(ctl->info)) {
  

• 	ksft_print_msg("%s value %lld less than minimum %lld\n",
  

• 		       ctl->name, int64_val,
  

• 		       snd_ctl_elem_info_get_min64(ctl->info));
  

• 	err = -1;
  

• }
  

• if (int64_val > snd_ctl_elem_info_get_max64(ctl->info)) {
  

• 	ksft_print_msg("%s value %lld more than maximum %lld\n",
  

• 		       ctl->name, int64_val,
  

• 		       snd_ctl_elem_info_get_max(ctl->info));
  

• 	err = -1;
  

• }
  

• /* Only check step size if there is one and we're in bounds */
  

• if (err >= 0 && snd_ctl_elem_info_get_step64(ctl->info) &&
  

•     (int64_val - snd_ctl_elem_info_get_min64(ctl->info)) %
  

•     snd_ctl_elem_info_get_step64(ctl->info)) {
  

• 	ksft_print_msg("%s value %lld invalid for step %lld minimum %lld\n",
  

• 		       ctl->name, int64_val,
  

• 		       snd_ctl_elem_info_get_step64(ctl->info),
  

• 		       snd_ctl_elem_info_get_min64(ctl->info));
  

• 	err = -1;
  

• }
  

• break;
  

• default:

• /* No tests for other types */
  

• ksft_test_result_skip("get_value.%d.%d\n",
  

• 		      ctl->card->card, ctl->elem);
  

• return;
  

• }

+out:

• ksft_test_result(err >= 0, "get_value.%d.%d\n",

• 	 ctl->card->card, ctl->elem);
  

+}

+bool show_mismatch(struct ctl_data *ctl, int index,

•    snd_ctl_elem_value_t *read_val,
  

•    snd_ctl_elem_value_t *expected_val)
  

+{

• long long expected_int, read_int;
• /*

• * We factor out the code to compare values representable as
  

• * integers, ensure that check doesn't log otherwise.
  

• */
  

• expected_int = 0;
• read_int = 0;
• switch (snd_ctl_elem_info_get_type(ctl->info)) {
• case SND_CTL_ELEM_TYPE_BOOLEAN:

• expected_int = snd_ctl_elem_value_get_boolean(expected_val,
  

• 					      index);
  

• read_int = snd_ctl_elem_value_get_boolean(read_val, index);
  

• break;
  

• case SND_CTL_ELEM_TYPE_INTEGER:

• expected_int = snd_ctl_elem_value_get_integer(expected_val,
  

• 					      index);
  

• read_int = snd_ctl_elem_value_get_integer(read_val, index);
  

• break;
  

• case SND_CTL_ELEM_TYPE_INTEGER64:

• expected_int = snd_ctl_elem_value_get_integer64(expected_val,
  

• 						index);
  

• read_int = snd_ctl_elem_value_get_integer64(read_val,
  

• 					    index);
  

• break;
  

• case SND_CTL_ELEM_TYPE_ENUMERATED:

• expected_int = snd_ctl_elem_value_get_enumerated(expected_val,
  

• 						 index);
  

• read_int = snd_ctl_elem_value_get_enumerated(read_val,
  

• 					     index);
  

• break;
  

• default:

• break;
  

• }
• if (expected_int != read_int) {

• ksft_print_msg("%s.%d expected %lld but read %lld\n",
  

• 	       ctl->name, index, expected_int, read_int);
  

• return true;
  

• } else {

• return false;
  

• }

+}

+/*

• • Write a value then if possible verify that we get the expected
• • result. An optional expected value can be provided if we expect
• • the write to fail, for verifying that invalid writes don't corrupt
• • anything.
• */

+int write_and_verify(struct ctl_data *ctl,

•      snd_ctl_elem_value_t *write_val,
  

•      snd_ctl_elem_value_t *expected_val)
  

+{

• int err, i;
• bool error_expected, mismatch_shown;
• snd_ctl_elem_value_t *read_val, *w_val;
• snd_ctl_elem_value_alloca(&read_val);
• snd_ctl_elem_value_alloca(&w_val);
• /*

• * We need to copy the write value since writing can modify
  

• * the value which causes surprises, and allocate an expected
  

• * value if we expect to read back what we wrote.
  

• */
  

• snd_ctl_elem_value_copy(w_val, write_val);
• if (expected_val) {

• error_expected = true;
  

• } else {

• error_expected = false;
  

• snd_ctl_elem_value_alloca(&expected_val);
  

• snd_ctl_elem_value_copy(expected_val, write_val);
  

• }
• /*

• * Do the write, if we have an expected value ignore the error
  

• * and carry on to validate the expected value.
  

• */
  

• err = snd_ctl_elem_write(ctl->card->handle, w_val);
• if (err < 0 && !error_expected) {

• ksft_print_msg("snd_ctl_elem_write() failed: %s\n",
  

• 	       snd_strerror(err));
  

• return err;
  

• }
• /* Can we do the verification part? */
• if (!snd_ctl_elem_info_is_readable(ctl->info))

• return err;
  

• snd_ctl_elem_value_set_id(read_val, ctl->id);
• err = snd_ctl_elem_read(ctl->card->handle, read_val);
• if (err < 0) {

• ksft_print_msg("snd_ctl_elem_read() failed: %s\n",
  

• 	       snd_strerror(err));
  

• return err;
  

• }
• /*

• * Use the libray to compare values, if there's a mismatch
  

• * carry on and try to provide a more useful diagnostic than
  

• * just "mismatch".
  

• */
  

• if (!snd_ctl_elem_value_compare(expected_val, read_val))

• return 0;
  

• mismatch_shown = false;
• for (i = 0; i < snd_ctl_elem_info_get_count(ctl->info); i++)

• if (show_mismatch(ctl, i, read_val, expected_val))
  

• 	mismatch_shown = true;
  

• if (!mismatch_shown)

• ksft_print_msg("%s read and written values differ\n",
  

• 	       ctl->name);
  

• return -1;

+}

+/*

• • Make sure we can write the default value back to the control, this
• • should validate that at least some write works.
• */

+void test_ctl_write_default(struct ctl_data *ctl) +{

• int err;
• /* If the control is turned off let's be polite */
• if (snd_ctl_elem_info_is_inactive(ctl->info)) {

• ksft_print_msg("%s is inactive\n", ctl->name);
  

• ksft_test_result_skip("write_default.%d.%d\n",
  

• 		      ctl->card->card, ctl->elem);
  

• return;
  

• }
• if (!snd_ctl_elem_info_is_writable(ctl->info)) {

• ksft_print_msg("%s is not writeable\n", ctl->name);
  

• ksft_test_result_skip("write_default.%d.%d\n",
  

• 		      ctl->card->card, ctl->elem);
  

• return;
  

• }
• /* No idea what the default was for unreadable controls */
• if (!snd_ctl_elem_info_is_readable(ctl->info)) {

• ksft_print_msg("%s couldn't read default\n", ctl->name);
  

• ksft_test_result_skip("write_default.%d.%d\n",
  

• 		      ctl->card->card, ctl->elem);
  

• return;
  

• }
• err = write_and_verify(ctl, ctl->def_val, NULL);
• ksft_test_result(err >= 0, "write_default.%d.%d\n",

• 	 ctl->card->card, ctl->elem);
  

+}

+bool test_ctl_write_valid_boolean(struct ctl_data *ctl) +{

• int err, i, j;
• bool fail = false;
• snd_ctl_elem_value_t *val;
• snd_ctl_elem_value_alloca(&val);
• snd_ctl_elem_value_set_id(val, ctl->id);
• for (i = 0; i < snd_ctl_elem_info_get_count(ctl->info); i++) {

• for (j = 0; j < 2; j++) {
  

• 	snd_ctl_elem_value_set_boolean(val, i, j);
  

• 	err = write_and_verify(ctl, val, NULL);
  

• 	if (err != 0)
  

• 		fail = true;
  

• }
  

• }
• return !fail;

+}

+bool test_ctl_write_valid_integer(struct ctl_data *ctl) +{

• int err;
• int i;
• long j, step;
• bool fail = false;
• snd_ctl_elem_value_t *val;
• snd_ctl_elem_value_alloca(&val);
• snd_ctl_elem_value_set_id(val, ctl->id);
• step = snd_ctl_elem_info_get_step(ctl->info);
• if (!step)

• step = 1;
  

• for (i = 0; i < snd_ctl_elem_info_get_count(ctl->info); i++) {

• for (j = snd_ctl_elem_info_get_min(ctl->info);
  

•      j <= snd_ctl_elem_info_get_max(ctl->info); j += step) {
  

• 	snd_ctl_elem_value_set_integer(val, i, j);
  

• 	err = write_and_verify(ctl, val, NULL);
  

• 	if (err != 0)
  

• 		fail = true;
  

• }
  

• }
• return !fail;

+}

+bool test_ctl_write_valid_integer64(struct ctl_data *ctl) +{

• int err, i;
• long long j, step;
• bool fail = false;
• snd_ctl_elem_value_t *val;
• snd_ctl_elem_value_alloca(&val);
• snd_ctl_elem_value_set_id(val, ctl->id);
• step = snd_ctl_elem_info_get_step64(ctl->info);
• if (!step)

• step = 1;
  

• for (i = 0; i < snd_ctl_elem_info_get_count(ctl->info); i++) {

• for (j = snd_ctl_elem_info_get_min64(ctl->info);
  

•      j <= snd_ctl_elem_info_get_max64(ctl->info); j += step) {
  

• 	snd_ctl_elem_value_set_integer64(val, i, j);
  

• 	err = write_and_verify(ctl, val, NULL);
  

• 	if (err != 0)
  

• 		fail = true;
  

• }
  

• }
• return !fail;

+}

+bool test_ctl_write_valid_enumerated(struct ctl_data *ctl) +{

• int err, i, j;
• bool fail = false;
• snd_ctl_elem_value_t *val;
• snd_ctl_elem_value_alloca(&val);
• snd_ctl_elem_value_set_id(val, ctl->id);
• for (i = 0; i < snd_ctl_elem_info_get_count(ctl->info); i++) {

• for (j = 0; j < snd_ctl_elem_info_get_items(ctl->info); j++) {
  

• 	snd_ctl_elem_value_set_enumerated(val, i, j);
  

• 	err = write_and_verify(ctl, val, NULL);
  

• 	if (err != 0)
  

• 		fail = true;
  

• }
  

• }
• return !fail;

+}

+void test_ctl_write_valid(struct ctl_data *ctl) +{

• bool pass;
• int err;
• /* If the control is turned off let's be polite */
• if (snd_ctl_elem_info_is_inactive(ctl->info)) {

• ksft_print_msg("%s is inactive\n", ctl->name);
  

• ksft_test_result_skip("write_valid.%d.%d\n",
  

• 		      ctl->card->card, ctl->elem);
  

• return;
  

• }
• if (!snd_ctl_elem_info_is_writable(ctl->info)) {

• ksft_print_msg("%s is not writeable\n", ctl->name);
  

• ksft_test_result_skip("write_valid.%d.%d\n",
  

• 		      ctl->card->card, ctl->elem);
  

• return;
  

• }
• switch (snd_ctl_elem_info_get_type(ctl->info)) {
• case SND_CTL_ELEM_TYPE_BOOLEAN:

• pass = test_ctl_write_valid_boolean(ctl);
  

• break;
  

• case SND_CTL_ELEM_TYPE_INTEGER:

• pass = test_ctl_write_valid_integer(ctl);
  

• break;
  

• case SND_CTL_ELEM_TYPE_INTEGER64:

• pass = test_ctl_write_valid_integer64(ctl);
  

• break;
  

• case SND_CTL_ELEM_TYPE_ENUMERATED:

• pass = test_ctl_write_valid_enumerated(ctl);
  

• break;
  

• default:

• /* No tests for this yet */
  

• ksft_test_result_skip("write_valid.%d.%d\n",
  

• 		      ctl->card->card, ctl->elem);
  

• return;
  

• }
• /* Restore the default value to minimise disruption */
• err = write_and_verify(ctl, ctl->def_val, NULL);
• if (err < 0)

• pass = false;
  

• ksft_test_result(pass, "write_valid.%d.%d\n",

• 	 ctl->card->card, ctl->elem);
  

+}

+int main(void) +{

• struct ctl_data *ctl;
• ksft_print_header();
• find_controls();
• ksft_set_plan(num_controls * TESTS_PER_CONTROL);
• for (ctl = ctl_list; ctl != NULL; ctl = ctl->next) {

• /* 
  

•  * Must test get_value() before we write anything, the
  

•  * test stores the default value for later cleanup.
  

•  */
  

• test_ctl_get_value(ctl);
  

• test_ctl_write_default(ctl);
  

• test_ctl_write_valid(ctl);
  

• }
• ksft_exit_pass();
• return 0;

+}

2.30.2