Re: [PATCH] m68k: let clk_enable() return immediately if clk is NULL

[Geert Uytterhoeven]

Hi Defang,

On Mon, Dec 28, 2020 at 3:08 AM Defang Bo <bodefang@xxxxxxx> wrote:
> Similar to commit<742859adc721>("m68k: let clk_disable() return immediately if clk is NULL").
> there should be a check for clk to prevent NULL pointer dereference.
>
> Signed-off-by: Defang Bo <bodefang@xxxxxxx>

Thanks for your patch!

> --- a/arch/m68k/coldfire/clk.c
> +++ b/arch/m68k/coldfire/clk.c
> @@ -90,6 +90,9 @@ EXPORT_SYMBOL(clk_get);
>  int clk_enable(struct clk *clk)
>  {
>         unsigned long flags;

Please keep the blank line between variable declarations and
statements (no complaint from scripts/checkpatch.pl? See
Documentation/process/submitting-patches.rst
).

> +       if (!clk)
> +               return -EINVAL;
> +
>         spin_lock_irqsave(&clk_lock, flags);
>         if ((clk->enabled++ == 0) && clk->clk_ops)
>                 clk->clk_ops->enable(clk);

Gr{oetje,eeting}s,

                        Geert

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

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