linux-kernel - RE: [PATCH 2/2] clk: renesas: Avoid mixing error pointers and NULL

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Message-ID: <OSZPR01MB70199F49C5F64B7245B0BE57AA0E9@OSZPR01MB7019.jpnprd01.prod.outlook.com>
Date:   Thu, 17 Jun 2021 14:40:24 +0000
From:   Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>
CC:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>
Subject: RE: [PATCH 2/2] clk: renesas: Avoid mixing error pointers and NULL

Hi Dan,

Thank you for the patch.

> -----Original Message-----
> From: Dan Carpenter <dan.carpenter@...cle.com>
> Sent: 17 June 2021 15:15
> To: Geert Uytterhoeven <geert+renesas@...der.be>; Prabhakar Mahadev Lad <prabhakar.mahadev-
> lad.rj@...renesas.com>
> Cc: Michael Turquette <mturquette@...libre.com>; Stephen Boyd <sboyd@...nel.org>; linux-renesas-
> soc@...r.kernel.org; linux-clk@...r.kernel.org; linux-kernel@...r.kernel.org; kernel-
> janitors@...r.kernel.org
> Subject: [PATCH 2/2] clk: renesas: Avoid mixing error pointers and NULL
> 
> These functions accidentally return both error pointers and NULL when there is an error.  It doesn't
> cause a problem but it is confusing and seems unintentional.
> 
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> ---
>  drivers/clk/renesas/renesas-rzg2l-cpg.c | 9 +++------
>  1 file changed, 3 insertions(+), 6 deletions(-)
> 

Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>

Cheers,
Prabhakar

> diff --git a/drivers/clk/renesas/renesas-rzg2l-cpg.c b/drivers/clk/renesas/renesas-rzg2l-cpg.c
> index 7ba36f19896f..83b58e1cb78f 100644
> --- a/drivers/clk/renesas/renesas-rzg2l-cpg.c
> +++ b/drivers/clk/renesas/renesas-rzg2l-cpg.c
> @@ -124,7 +124,7 @@ rzg2l_cpg_div_clk_register(const struct cpg_core_clk *core,
>  						 core->flag, &priv->rmw_lock);
> 
>  	if (IS_ERR(clk_hw))
> -		return NULL;
> +		return ERR_CAST(clk_hw);
> 
>  	return clk_hw->clk;
>  }
> @@ -174,17 +174,14 @@ rzg2l_cpg_pll_clk_register(const struct cpg_core_clk *core,
>  	struct clk_init_data init;
>  	const char *parent_name;
>  	struct pll_clk *pll_clk;
> -	struct clk *clk;
> 
>  	parent = clks[core->parent & 0xffff];
>  	if (IS_ERR(parent))
>  		return ERR_CAST(parent);
> 
>  	pll_clk = devm_kzalloc(dev, sizeof(*pll_clk), GFP_KERNEL);
> -	if (!pll_clk) {
> -		clk = ERR_PTR(-ENOMEM);
> -		return NULL;
> -	}
> +	if (!pll_clk)
> +		return ERR_PTR(-ENOMEM);
> 
>  	parent_name = __clk_get_name(parent);
>  	init.name = core->name;
> --
> 2.30.2