linux-kernel - Re: [PATCH v3 22/31] clk: mediatek: gate: Implement error handling in register API

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Date:   Tue, 15 Feb 2022 15:01:53 +0800
From:   Chun-Jie Chen <chun-jie.chen@...iatek.com>
To:     Chen-Yu Tsai <wenst@...omium.org>, Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Matthias Brugger <matthias.bgg@...il.com>
CC:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Miles Chen <miles.chen@...iatek.com>,
        <linux-clk@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 22/31] clk: mediatek: gate: Implement error handling
 in register API

On Tue, 2022-02-08 at 20:40 +0800, Chen-Yu Tsai wrote:
> The gate clk type registration function does not stop or return
> errors
> if any clk failed to be registered, nor does it implement an error
> handling path. This may result in a partially working device if any
> step failed.
> 
> Make the register function return proper error codes, and bail out if
> errors occur. Proper cleanup, i.e. unregister any clks that were
> successfully registered, is done in the new error path.
> 
> Signed-off-by: Chen-Yu Tsai <wenst@...omium.org>
> Reviewed-by: Miles Chen <miles.chen@...iatek.com>
> Reviewed-by: AngeloGioacchino Del Regno <
> angelogioacchino.delregno@...labora.com>

Reviewed-by: Chun-Jie Chen <chun-jie.chen@...iatek.com>
> ---
>  drivers/clk/mediatek/clk-gate.c | 15 ++++++++++++++-
>  1 file changed, 14 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/clk/mediatek/clk-gate.c
> b/drivers/clk/mediatek/clk-gate.c
> index e8881ae1489a..631ff170b7b9 100644
> --- a/drivers/clk/mediatek/clk-gate.c
> +++ b/drivers/clk/mediatek/clk-gate.c
> @@ -237,13 +237,26 @@ int mtk_clk_register_gates_with_dev(struct
> device_node *node,
>  
>  		if (IS_ERR(clk)) {
>  			pr_err("Failed to register clk %s: %pe\n",
> gate->name, clk);
> -			continue;
> +			goto err;
>  		}
>  
>  		clk_data->clks[gate->id] = clk;
>  	}
>  
>  	return 0;
> +
> +err:
> +	while (--i >= 0) {
> +		const struct mtk_gate *gate = &clks[i];
> +
> +		if (IS_ERR_OR_NULL(clk_data->clks[gate->id]))
> +			continue;
> +
> +		mtk_clk_unregister_gate(clk_data->clks[gate->id]);
> +		clk_data->clks[gate->id] = ERR_PTR(-ENOENT);
> +	}
> +
> +	return PTR_ERR(clk);
>  }
>  
>  int mtk_clk_register_gates(struct device_node *node,