linux-kernel - Re: [PATCH] clk: vc5: Initialize src in vc5_mux_set

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Date:   Sun, 16 Dec 2018 09:20:44 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Stephen Boyd <sboyd@...nel.org>
Cc:     Michael Turquette <mturquette@...libre.com>,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
        Marek Vasut <marek.vasut+renesas@...il.com>,
        Alexey Firago <alexey_firago@...tor.com>,
        linux-renesas-soc@...r.kernel.org
Subject: Re: [PATCH] clk: vc5: Initialize src in vc5_mux_set_parent()

Hi Stephen,

On Friday, 14 December 2018 23:49:59 EET Stephen Boyd wrote:
> It seems that it may be possible to get to the regmap update call
> without ever initializing this variable, so just set it to 0 to be safe.

This can't happen as the probe() function would have failed first. I'd thus 
add a comment to explain that the goal is only to silence a compiler warning.

> Cc: Marek Vasut <marek.vasut+renesas@...il.com>
> Cc: Alexey Firago <alexey_firago@...tor.com>
> Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> Cc: linux-renesas-soc@...r.kernel.org
> Signed-off-by: Stephen Boyd <sboyd@...nel.org>
> ---
>  drivers/clk/clk-versaclock5.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/clk/clk-versaclock5.c b/drivers/clk/clk-versaclock5.c
> index 5b393e711e94..026f76276933 100644
> --- a/drivers/clk/clk-versaclock5.c
> +++ b/drivers/clk/clk-versaclock5.c
> @@ -246,7 +246,7 @@ static int vc5_mux_set_parent(struct clk_hw *hw, u8
> index) struct vc5_driver_data *vc5 =
>  		container_of(hw, struct vc5_driver_data, clk_mux);
>  	const u8 mask = VC5_PRIM_SRC_SHDN_EN_XTAL | VC5_PRIM_SRC_SHDN_EN_CLKIN;
> -	u8 src;
> +	u8 src = 0;
> 
>  	if ((index > 1) || !vc5->clk_mux_ins)
>  		return -EINVAL;


-- 
Regards,

Laurent Pinchart