linux-kernel - Re: [PATCH v2 01/23] clk: mediatek: mt8192: Correctly unregister and free clocks on failure

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Message-ID: <20230104105535.j7zasooq5u2xgng6@blmsp>
Date:   Wed, 4 Jan 2023 11:55:35 +0100
From:   Markus Schneider-Pargmann <msp@...libre.com>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     mturquette@...libre.com, sboyd@...nel.org, matthias.bgg@...il.com,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        wenst@...omium.org, johnson.wang@...iatek.com,
        miles.chen@...iatek.com, fparent@...libre.com,
        chun-jie.chen@...iatek.com, sam.shih@...iatek.com,
        y.oudjana@...tonmail.com, nfraprado@...labora.com,
        rex-bc.chen@...iatek.com, ryder.lee@...nel.org,
        daniel@...rotopia.org, jose.exposito89@...il.com,
        yangyingliang@...wei.com, pablo.sun@...iatek.com,
        weiyi.lu@...iatek.com, ikjn@...omium.org,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, devicetree@...r.kernel.org,
        kernel@...labora.com
Subject: Re: [PATCH v2 01/23] clk: mediatek: mt8192: Correctly unregister and
 free clocks on failure

Hi Angelo,

On Fri, Dec 23, 2022 at 10:42:37AM +0100, AngeloGioacchino Del Regno wrote:
> If anything fails during probe of the clock controller(s), unregister
> (and kfree!) whatever we have previously registered to leave with a
> clean state and prevent leaks.
> 
> Fixes: 710573dee31b ("clk: mediatek: Add MT8192 basic clocks support")
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> ---
>  drivers/clk/mediatek/clk-mt8192.c | 72 ++++++++++++++++++++++++-------
>  1 file changed, 56 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/clk/mediatek/clk-mt8192.c b/drivers/clk/mediatek/clk-mt8192.c
> index 0e88588b2c49..eff66ca6c6a7 100644
> --- a/drivers/clk/mediatek/clk-mt8192.c
> +++ b/drivers/clk/mediatek/clk-mt8192.c
> @@ -1100,27 +1100,61 @@ static int clk_mt8192_top_probe(struct platform_device *pdev)
>  	if (IS_ERR(base))
>  		return PTR_ERR(base);
>  
> -	mtk_clk_register_fixed_clks(top_fixed_clks, ARRAY_SIZE(top_fixed_clks), top_clk_data);
> -	mtk_clk_register_factors(top_early_divs, ARRAY_SIZE(top_early_divs), top_clk_data);
> -	mtk_clk_register_factors(top_divs, ARRAY_SIZE(top_divs), top_clk_data);
> -	mtk_clk_register_muxes(top_mtk_muxes, ARRAY_SIZE(top_mtk_muxes), node, &mt8192_clk_lock,
> -			       top_clk_data);
> -	mtk_clk_register_composites(top_muxes, ARRAY_SIZE(top_muxes), base, &mt8192_clk_lock,
> -				    top_clk_data);
> -	mtk_clk_register_composites(top_adj_divs, ARRAY_SIZE(top_adj_divs), base, &mt8192_clk_lock,
> -				    top_clk_data);
> -	r = mtk_clk_register_gates(node, top_clks, ARRAY_SIZE(top_clks), top_clk_data);
> +	r = mtk_clk_register_fixed_clks(top_fixed_clks, ARRAY_SIZE(top_fixed_clks), top_clk_data);
>  	if (r)
>  		return r;
>  
> +	r = mtk_clk_register_factors(top_early_divs, ARRAY_SIZE(top_early_divs), top_clk_data);
> +	if (r)
> +		goto unregister_fixed_clks;
> +
> +	r = mtk_clk_register_factors(top_divs, ARRAY_SIZE(top_divs), top_clk_data);
> +	if (r)
> +		goto unregister_early_factors;
> +
> +	r = mtk_clk_register_muxes(top_mtk_muxes, ARRAY_SIZE(top_mtk_muxes), node,
> +				   &mt8192_clk_lock, top_clk_data);
> +	if (r)
> +		goto unregister_factors;
> +
> +	r = mtk_clk_register_composites(top_muxes, ARRAY_SIZE(top_muxes), base,
> +					&mt8192_clk_lock, top_clk_data);
> +	if (r)
> +		goto unregister_muxes;
> +
> +	r = mtk_clk_register_composites(top_adj_divs, ARRAY_SIZE(top_adj_divs), base,
> +					&mt8192_clk_lock, top_clk_data);
> +	if (r)
> +		goto unregister_top_composites;
> +
> +	r = mtk_clk_register_gates(node, top_clks, ARRAY_SIZE(top_clks), top_clk_data);
> +	if (r)
> +		goto unregister_adj_divs_composites;
> +
>  	r = clk_mt8192_reg_mfg_mux_notifier(&pdev->dev,
>  					    top_clk_data->hws[CLK_TOP_MFG_PLL_SEL]->clk);
>  	if (r)
> -		return r;
> -
> +		goto unregister_gates;
>  
>  	return of_clk_add_hw_provider(node, of_clk_hw_onecell_get,
>  				      top_clk_data);

I think you may have missed this one. If of_clk_add_hw_provider fails
you should unregister all of the above, right?

Otherwise:
Reviewed-by: Markus Schneider-Pargmann <msp@...libre.com>

> +
> +unregister_gates:
> +	mtk_clk_unregister_gates(top_clks, ARRAY_SIZE(top_clks), top_clk_data);
> +unregister_adj_divs_composites:
> +	mtk_clk_unregister_composites(top_adj_divs, ARRAY_SIZE(top_adj_divs), top_clk_data);
> +unregister_top_composites:
> +	mtk_clk_unregister_composites(top_muxes, ARRAY_SIZE(top_muxes), top_clk_data);
> +unregister_muxes:
> +	mtk_clk_unregister_muxes(top_mtk_muxes, ARRAY_SIZE(top_mtk_muxes), top_clk_data);
> +unregister_factors:
> +	mtk_clk_unregister_factors(top_divs, ARRAY_SIZE(top_divs), top_clk_data);
> +unregister_early_factors:
> +	mtk_clk_unregister_factors(top_early_divs, ARRAY_SIZE(top_early_divs), top_clk_data);
> +unregister_fixed_clks:
> +	mtk_clk_unregister_fixed_clks(top_fixed_clks, ARRAY_SIZE(top_fixed_clks),
> +				      top_clk_data);
> +	return r;
>  }
>  
>  static int clk_mt8192_infra_probe(struct platform_device *pdev)
> @@ -1139,14 +1173,16 @@ static int clk_mt8192_infra_probe(struct platform_device *pdev)
>  
>  	r = mtk_register_reset_controller_with_dev(&pdev->dev, &clk_rst_desc);
>  	if (r)
> -		goto free_clk_data;
> +		goto unregister_gates;
>  
>  	r = of_clk_add_hw_provider(node, of_clk_hw_onecell_get, clk_data);
>  	if (r)
> -		goto free_clk_data;
> +		goto unregister_gates;
>  
>  	return r;
>  
> +unregister_gates:
> +	mtk_clk_unregister_gates(infra_clks, ARRAY_SIZE(infra_clks), clk_data);
>  free_clk_data:
>  	mtk_free_clk_data(clk_data);
>  	return r;
> @@ -1168,10 +1204,12 @@ static int clk_mt8192_peri_probe(struct platform_device *pdev)
>  
>  	r = of_clk_add_hw_provider(node, of_clk_hw_onecell_get, clk_data);
>  	if (r)
> -		goto free_clk_data;
> +		goto unregister_gates;
>  
>  	return r;
>  
> +unregister_gates:
> +	mtk_clk_unregister_gates(peri_clks, ARRAY_SIZE(peri_clks), clk_data);
>  free_clk_data:
>  	mtk_free_clk_data(clk_data);
>  	return r;
> @@ -1194,10 +1232,12 @@ static int clk_mt8192_apmixed_probe(struct platform_device *pdev)
>  
>  	r = of_clk_add_hw_provider(node, of_clk_hw_onecell_get, clk_data);
>  	if (r)
> -		goto free_clk_data;
> +		goto unregister_gates;
>  
>  	return r;
>  
> +unregister_gates:
> +	mtk_clk_unregister_gates(apmixed_clks, ARRAY_SIZE(apmixed_clks), clk_data);
>  free_clk_data:
>  	mtk_free_clk_data(clk_data);
>  	return r;
> -- 
> 2.39.0
>