[LTP] [PATCH] input_helper: Modify the check range of the input event number

[Kogure Akihisa ( 小暮 明久 )]

Hi !

> I guess that since we are changing the code we can as well add a bigger
> value there. Let's bump it at least ten times so that we don't have to
> change it again later on.

The following commit was set to 1023 for the upper limit of event IDs, so we changed it to check up to 0-1023.
https://github.com/torvalds/linux/commit/7f8d4cad1e4e11a45d02bd6e024cc2812963c38a

---

If the input event number is greater than 32, the newly added event ID
will be 256 or later.
When there were already 32 input events in the device, this test program
only checked 0~99, so it failed because it could not find a new input
event ID.

In order to eliminate this failure, we changed the event ID range to be
checked by this test program to 0~1023.
(https://github.com/torvalds/linux/commit/7f8d4cad1e4e11a45d02bd6e024cc2812963c38a, it looks like the upper limit should be 1023.)

---

diff --git a/testcases/kernel/input/input_helper.c b/testcases/kernel/input/input_helper.c
index 09530fb..6b60d17 100644
--- a/testcases/kernel/input/input_helper.c
+++ b/testcases/kernel/input/input_helper.c
@@ -40,7 +40,7 @@
      int ret, fd = -1;
      unsigned int i;

-     for (i = 0; i < 100; i++) {
+     for (i = 0; i < 1024; i++) {
            snprintf(path, sizeof(path), "/dev/input/event%i", i);

            fd = open(path, O_RDONLY);



---
Akihisa Kogure
akihisa.kogure.ke@kyocera.jp

________________________________
差出人: Cyril Hrubis <chrubis@suse.cz>
送信日時: 2024年3月26日 23:37
宛先: Kogure Akihisa　( 小暮　明久 ) <akihisa.kogure.ke@kyocera.jp>
CC: ltp@lists.linux.it <ltp@lists.linux.it>
件名: Re: [LTP] [PATCH] input_helper: Modify the check range of the input event number

Hi!
> > If the input event number is greater than 32, the newly added event ID
> > will be 256 or later.
>
> I've tried it and it seems to work that way, but it strange why these
> are numbered discontinously. May be even a bug.

And apparently this is intentional:

commit 7f8d4cad1e4e11a45d02bd6e024cc2812963c38a
Author: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Date:   Mon Oct 8 09:07:24 2012 -0700

    Input: extend the number of event (and other) devices


--
Cyril Hrubis
chrubis@suse.cz