[igt-dev] [PATCH i-g-t] lib/pm: Wait a little for sound module load to complete

[Chris Wilson]

Quoting Chris Wilson (2018-09-03 13:51:10)
> Sometimes we may probe the sound module as it is still being registered
> and its debugfs not yet fully populated. If we do not find a file we
> expect to exist, sleep a little and check again.
> 
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107801
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Imre Deak <imre.deak at linux.com>
> ---
>  lib/igt_pm.c | 22 +++++++++++++++-------
>  1 file changed, 15 insertions(+), 7 deletions(-)
> 
> diff --git a/lib/igt_pm.c b/lib/igt_pm.c
> index 339a51e6f..e383f18b5 100644
> --- a/lib/igt_pm.c
> +++ b/lib/igt_pm.c
> @@ -154,20 +154,28 @@ static int __igt_pm_enable_audio_runtime_pm(void)
>         while ((de = readdir(dir))) {
>                 const char *match = "hwC";
>                 char buf[32] = { }; /* for Valgrind */
> -               char *tmp;
> +               int loops = 500;
> +               int base;
>                 int ret;
>  
>                 if (de->d_type != DT_LNK ||
>                     strncmp(de->d_name, match, strlen(match)))
>                         continue;
>  
> -               igt_assert(asprintf(&tmp,
> -                                   "/sys/class/sound/%s/vendor_name",
> -                                   de->d_name));
> +               base = openat(dir, de->d_name, O_RDONLY);
s/dir/dirfd(dir)/
-Chris