linux-kernel - Re: [v2] dma-buf: heaps: bugfix for selftest failure

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Date:   Wed, 26 Aug 2020 14:47:35 -0300
From:   Ezequiel Garcia <ezequiel@...guardiasur.com.ar>
To:     Leon He <hexiaolong2008@...il.com>
Cc:     Shuah Khan <shuah@...nel.org>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        linux-kselftest@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-media <linux-media@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        linaro-mm-sig@...ts.linaro.org, Leon He <leon.he@...soc.com>
Subject: Re: [v2] dma-buf: heaps: bugfix for selftest failure

Hi Leon, Shuah,

Thanks for the fix. I had this issue pending to fix,
but have been lazy about it, I appreciate you are taking care of it!

On Sat, 7 Mar 2020 at 11:03, Leon He <hexiaolong2008@...il.com> wrote:
>
> From: Leon He <leon.he@...soc.com>
>
> There are two errors in the dmabuf-heap selftest:
> 1. The 'char name[5]' was not initialized to zero, which will cause
>    strcmp(name, "vgem") failed in check_vgem().
> 2. The return value of test_alloc_errors() should be reversed, other-
>    wise the while loop in main() will be broken.
>
> Signed-off-by: Leon He <leon.he@...soc.com>
> ---
>  tools/testing/selftests/dmabuf-heaps/dmabuf-heap.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/tools/testing/selftests/dmabuf-heaps/dmabuf-heap.c b/tools/testing/selftests/dmabuf-heaps/dmabuf-heap.c
> index cd5e1f6..836b185 100644
> --- a/tools/testing/selftests/dmabuf-heaps/dmabuf-heap.c
> +++ b/tools/testing/selftests/dmabuf-heaps/dmabuf-heap.c
> @@ -22,7 +22,7 @@
>  static int check_vgem(int fd)
>  {
>         drm_version_t version = { 0 };
> -       char name[5];
> +       char name[5] = { 0 };
>         int ret;
>

As Shuah already mentioned, I think we want to use strncmp
to be on the safe side.

>         version.name_len = 4;
> @@ -357,7 +357,7 @@ static int test_alloc_errors(char *heap_name)
>         if (heap_fd >= 0)
>                 close(heap_fd);
>
> -       return ret;
> +       return !ret;

I agree with Shuah, this change makes no sense, just drop it.

I think the fact this test was broken and nobody noticed
uncovers the fact that the test isn't being run.

Any reason why this test isn't a regular TARGET?
Or any idea how we can make sure this is run by CIs
and any other testing system?

Thanks!
Ezequiel

>  }
>
>  int main(void)
> --
> 2.7.4
>