linux-kernel - Re: [PATCH v2] selftests/input: introduce a test for the EVIOCGLED ioctl

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Date:   Thu, 22 Jun 2023 17:24:52 +0200
From:   Enric Balletbo Serra <eballetbo@...il.com>
To:     Dana Elfassy <delfassy@...hat.com>
Cc:     shuah@...nel.org, eballetbo@...nel.org, usama.anjum@...labora.com,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        Dana Elfassy <dangel101@...il.com>
Subject: Re: [PATCH v2] selftests/input: introduce a test for the EVIOCGLED ioctl

Hi Dana,

Thanks for taking my comments into consideration.

Missatge de Dana Elfassy <delfassy@...hat.com> del dia dj., 22 de juny
2023 a les 16:35:
>
> This patch introduces a specific test case for the EVIOCGLED ioctl.
> The test covers the case where len > maxlen in the
> EVIOCGLED(sizeof(all_leds)), all_leds) ioctl.
>

If I understand correctly this covers the same code path in the kernel
as the EVIOCGKEY test [1] that you sent before. The only difference is
that from the userspace point of view, the entry point is different,
here you use EVIOCGLED as a trigerr and before you used EVIOCGKEY. But
once in the kernel, the code path is the same. I am not sure if it
makes really sense to repeat this test, but it is up to maintainers to
decide. In any case, it looks good to me, so

> Signed-off-by: Dana Elfassy <dangel101@...il.com>

Reviewed-by: Enric Balletbo i Serra <eballetbo@...nel.org>

[1] https://patchwork.kernel.org/project/linux-kselftest/patch/20230622141802.135723-1-dangel101@gmail.com/

> ---
> Changes in v2:
> - Changed variable leds from an array to an int
>
> This patch depends on '[v3] selftests/input: Introduce basic tests for evdev ioctls' [1] sent to the ML.
> [1] https://patchwork.kernel.org/project/linux-input/patch/20230607153214.15933-1-eballetbo@kernel.org/
>
>  tools/testing/selftests/input/evioc-test.c | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
>
> diff --git a/tools/testing/selftests/input/evioc-test.c b/tools/testing/selftests/input/evioc-test.c
> index ad7b93fe39cf..378db2b4dd56 100644
> --- a/tools/testing/selftests/input/evioc-test.c
> +++ b/tools/testing/selftests/input/evioc-test.c
> @@ -234,4 +234,21 @@ TEST(eviocsrep_set_repeat_settings)
>         selftest_uinput_destroy(uidev);
>  }
>
> +TEST(eviocgled_get_all_leds)
> +{
> +       struct selftest_uinput *uidev;
> +       int leds = 0;
> +       int rc;
> +
> +       rc = selftest_uinput_create_device(&uidev, -1);
> +       ASSERT_EQ(0, rc);
> +       ASSERT_NE(NULL, uidev);
> +
> +       /* ioctl to set the maxlen = 0 */
> +       rc = ioctl(uidev->evdev_fd, EVIOCGLED(0), leds);
> +       ASSERT_EQ(0, rc);
> +
> +       selftest_uinput_destroy(uidev);
> +}
> +
>  TEST_HARNESS_MAIN
> --
> 2.41.0
>