Re: Re: [PATCH] media: vsp1: Fix runtime PM imbalance in vsp1_probe

Geert Uytterhoeven
2020-06-08T07:40:08Z

Hi Dinghao,

On Mon, Jun 8, 2020 at 5:03 AM <dinghao.liu@zju.edu.cn> wrote:
> > > I wonder how many bugs we have today, and how many bugs will keep
> > > appearing in the future, due to this historical design mistake :-(
>
> Good question. It's hard to say if this is a design mistake (some use
> of this API does not check its return value and expects it always to
> increment the usage counter). But it does make developers misuse it easier.

On Renesas SoCs, I believe these can only fail if there's something
seriously wrong, which means the system could never have gotten this far
in the boot sequence anyway. That's why I tend not to check the result
of pm_runtime_get_sync() at all (on drivers for Renesas SoCs).

Gr{oetje,eeting}s,

Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds