linux-kernel - Re: [PATCH 0/2] Input: tests

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Date:   Wed, 03 May 2023 09:05:46 +0200
From:   Javier Martinez Canillas <javierm@...hat.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     Brendan Higgins <brendan.higgins@...ux.dev>,
        David Gow <davidgow@...gle.com>, linux-input@...r.kernel.org,
        linux-kselftest@...r.kernel.org, kunit-dev@...glegroups.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] Input: tests - miscellaneous fixes

Geert Uytterhoeven <geert@...ux-m68k.org> writes:

> Hi Dmitry,
>
> On Tue, May 2, 2023 at 7:05 PM Dmitry Torokhov
> <dmitry.torokhov@...il.com> wrote:
>> On Tue, May 02, 2023 at 06:31:51PM +0200, Javier Martinez Canillas wrote:
>> > Geert Uytterhoeven <geert@...ux-m68k.org> writes:
>> > > On Tue, May 2, 2023 at 12:17 PM Geert Uytterhoeven
>> > > <geert+renesas@...der.be> wrote:
>> > >> This patch series fixes a crash in the new input selftest, and makes the
>> > >> test available when the KUnit framework is modular.
>> > >>
>> > >> Unfortunately test 3 still fails for me (tested on Koelsch (R-Car M2-W)
>> > >> and ARAnyM):
>> > >>
>> > >>         KTAP version 1
>> > >>         # Subtest: input_core
>> > >>         1..3
>> > >>     input: Test input device as /devices/virtual/input/input1
>> > >>         ok 1 input_test_polling
>> > >>     input: Test input device as /devices/virtual/input/input2
>> > >>         ok 2 input_test_timestamp
>> > >>     input: Test input device as /devices/virtual/input/input3
>> > >>         # input_test_match_device_id: ASSERTION FAILED at # drivers/input/tests/input_test.c:99
>> > >>         Expected input_match_device_id(input_dev, &id) to be true, but is false
>> > >>         not ok 3 input_test_match_device_id
>> > >>     # input_core: pass:2 fail:1 skip:0 total:3
>> > >>     # Totals: pass:2 fail:1 skip:0 total:3
>> > >>     not ok 1 input_core
>> > >
>> > > Adding more debug code shows that it's the test on evbit [1] in
>> > > input_match_device_id() that fails.
>> > > Looking at your input_test_match_device_id(), I think you expect
>> > > the checks for the various bitmaps to be gated by
>> > > "if (id->flags & INPUT_DEVICE_ID_MATCH_EVBIT)", like is done for the
>> > > other checks?
>> > >
>> > > [1] https://elixir.bootlin.com/linux/latest/source/drivers/input/input.c#L1021
>> > >
>> >
>> > That's correct. In input_test_init(), the input dev is marked as capable
>> > of emitting EV_KEY BTN_LEFT and BTN_RIGHT. The goal of that test was to
>> > check this.
>> >
>> > That is, check if matches by the input dev capabilities in which case the
>> > __set_bit(EV_KEY, ...) would make the match true and __set_bit(EV_ABS, ..)
>> > would make the condition false.
>> >
>> > But maybe I misunderstood how the input_set_capability() and __set_bit()
>> > functions work ?
>> >
>> > I'll take a look to this tomorrow, thanks a lot for your report!
>>
>> Unfortunately (?) INPUT_DEVICE_ID_MATCH_*BIT have never had any effect,
>> the kernel always used bitmaps when matching (with the assumption that
>> if one does not care about given bitmap they can simply pass empty one),
>> so I think what we need to change is:
>>
>> diff --git a/drivers/input/tests/input_test.c b/drivers/input/tests/input_test.c
>> index 8b8ac3412a70..0540225f0288 100644
>> --- a/drivers/input/tests/input_test.c
>> +++ b/drivers/input/tests/input_test.c
>> @@ -87,7 +87,7 @@ static void input_test_timestamp(struct kunit *test)
>>  static void input_test_match_device_id(struct kunit *test)
>>  {
>>         struct input_dev *input_dev = test->priv;
>> -       struct input_device_id id;
>> +       struct input_device_id id = { 0 };
>>
>>         /*
>>          * Must match when the input device bus, vendor, product, version
>>
>> to avoid having garbage in the match data.
>
> Thanks, that did the trick! 3/3 tests pass.
>

Oh, silly me. Are you going to post that as a proper patch ?

-- 
Best regards,

Javier Martinez Canillas
Core Platforms
Red Hat