Re: [PATCH] clk: mediatek: fix cppcheck error for uninitialized variable

AngeloGioacchino Del Regno
2024-01-02T09:42:16Z

Il 25/12/23 16:28, ha scritto:
> From: Kishan Dudhatra <kishan.dudhatra@siliconsignals.io>
>
> cppcheck reports below warning
>
> clk/mediatek/clk-fhctl.c:206:27:
> error: Uninitialized variable: pll_postdiv [uninitvar]
> if (postdiv && postdiv < pll_postdiv)
>
> This is due to uninitialization of variable pll_postdiv,
> which is now initialized as part of this patch.
>
> Signed-off-by: Kishan Dudhatra <kishan.dudhatra@siliconsignals.io>

This is a false positive... the pll_postdiv variable is *always* used
and *only if* postdiv > 0.

P.S.: There was some problem with your email, as the From entry is empty.

Regards,
Angelo

>
> diff --git a/drivers/clk/mediatek/clk-fhctl.c b/drivers/clk/mediatek/clk-fhctl.c
> index 33b6ad8fdc2e..b0e71e4fd938 100644
> --- a/drivers/clk/mediatek/clk-fhctl.c
> +++ b/drivers/clk/mediatek/clk-fhctl.c
> @@ -186,7 +186,7 @@ static int fhctl_hopping(struct mtk_fh *fh, unsigned int new_dds,
> struct fh_pll_regs *regs = &fh->regs;
> struct mtk_clk_pll *pll = &fh->clk_pll;
> spinlock_t *lock = fh->lock;
> - unsigned int pll_postdiv;
> + unsigned int pll_postdiv = 0;
> unsigned long flags = 0;
> int ret;
>

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