linux-kernel - Re: [PATCH AUTOSEL 4.9 08/13] video: fbdev: simplefb: Check before clk

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Date:   Thu, 30 Jun 2022 21:31:11 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Sasha Levin <sashal@...nel.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        stable <stable@...r.kernel.org>, Yihao Han <hanyihao@...o.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Helge Deller <deller@....de>,
        Linux Fbdev development list <linux-fbdev@...r.kernel.org>,
        DRI Development <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH AUTOSEL 4.9 08/13] video: fbdev: simplefb: Check before
 clk_put() not needed

Hi Sasha,

On Tue, Jun 28, 2022 at 4:32 AM Sasha Levin <sashal@...nel.org> wrote:
> From: Yihao Han <hanyihao@...o.com>
>
> [ Upstream commit 5491424d17bdeb7b7852a59367858251783f8398 ]
>
> clk_put() already checks the clk ptr using !clk and IS_ERR()

While I think that is true for all clock implementations in v5.19-rc4,
it is not true for v4.9.320.

> so there is no need to check it again before calling it.
>
> Signed-off-by: Yihao Han <hanyihao@...o.com>
> Reviewed-by: Hans de Goede <hdegoede@...hat.com>
> Signed-off-by: Helge Deller <deller@....de>
> Signed-off-by: Sasha Levin <sashal@...nel.org>

> --- a/drivers/video/fbdev/simplefb.c
> +++ b/drivers/video/fbdev/simplefb.c
> @@ -231,8 +231,7 @@ static int simplefb_clocks_init(struct simplefb_par *par,
>                 if (IS_ERR(clock)) {
>                         if (PTR_ERR(clock) == -EPROBE_DEFER) {
>                                 while (--i >= 0) {
> -                                       if (par->clks[i])
> -                                               clk_put(par->clks[i]);
> +                                       clk_put(par->clks[i]);
>                                 }
>                                 kfree(par->clks);
>                                 return -EPROBE_DEFER;

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-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