Re: [PATCH V3] clk: hisilicon: refine hi3620_mmc_clk_init() and fix memory leak issues

[Dongjiu Geng]

add Markus

On 2020/11/13 3:22, Dongjiu Geng wrote:
> Refine hi3620_mmc_clk_init() to use of_clk_add_hw_provider()
> instead of of_clk_add_provider(), the called function hisi_register_clk_mmc()
> returns 'clk_hw *' to adapt to this change.  Also free memory mapping and
> free hw_data if clock initialization is failed.
> 
> Fix the memory leak issues in hisi_clk_init().
> 
> Fixes: 75af25f581b1 ("clk: hisi: remove static variable")
> Fixes: 62ac983b6141 ("clk: hisilicon: add hi3620_mmc_clks")
> Cc: Markus Elfring <Markus.Elfring@xxxxxx>
> Signed-off-by: Dongjiu Geng <gengdongjiu@xxxxxxxxxx>
> ---
> v2->v3:
> 1. Refind hi3620_mmc_clk_init() and hisi_register_clk_mmc() in order to use
>    of_clk_add_hw_provider().
> 2. Fix the issue that incorrectly free data even clock is initialized
>    successfully.
> ---
>  drivers/clk/hisilicon/clk-hi3620.c | 44 ++++++++++++++++++------------
>  drivers/clk/hisilicon/clk.c        | 11 ++++----
>  2 files changed, 33 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/clk/hisilicon/clk-hi3620.c b/drivers/clk/hisilicon/clk-hi3620.c
> index a3d04c7c3da8..3dec48174560 100644
> --- a/drivers/clk/hisilicon/clk-hi3620.c
> +++ b/drivers/clk/hisilicon/clk-hi3620.c
> @@ -408,12 +408,13 @@ static const struct clk_ops clk_mmc_ops = {
>  	.recalc_rate = mmc_clk_recalc_rate,
>  };
>  
> -static struct clk *hisi_register_clk_mmc(struct hisi_mmc_clock *mmc_clk,
> +static struct clk_hw *hisi_register_clk_mmc(struct hisi_mmc_clock *mmc_clk,
>  			void __iomem *base, struct device_node *np)
>  {
>  	struct clk_mmc *mclk;
> -	struct clk *clk;
> +	struct clk_hw *hw;
>  	struct clk_init_data init;
> +	int err;
>  
>  	mclk = kzalloc(sizeof(*mclk), GFP_KERNEL);
>  	if (!mclk)
> @@ -439,17 +440,22 @@ static struct clk *hisi_register_clk_mmc(struct hisi_mmc_clock *mmc_clk,
>  	mclk->sam_off = mmc_clk->sam_off;
>  	mclk->sam_bits = mmc_clk->sam_bits;
>  
> -	clk = clk_register(NULL, &mclk->hw);
> -	if (WARN_ON(IS_ERR(clk)))
> +	hw = &mclk->hw;
> +	err = clk_hw_register(NULL, hw);
> +
> +	if (err) {
>  		kfree(mclk);
> -	return clk;
> +		return ERR_PTR(err);
> +	}
> +
> +	return hw;
>  }
>  
>  static void __init hi3620_mmc_clk_init(struct device_node *node)
>  {
>  	void __iomem *base;
> -	int i, num = ARRAY_SIZE(hi3620_mmc_clks);
> -	struct clk_onecell_data *clk_data;
> +	int i, ret, num = ARRAY_SIZE(hi3620_mmc_clks);
> +	struct clk_hw_onecell_data *hw_data;
>  
>  	if (!node) {
>  		pr_err("failed to find pctrl node in DTS\n");
> @@ -462,22 +468,26 @@ static void __init hi3620_mmc_clk_init(struct device_node *node)
>  		return;
>  	}
>  
> -	clk_data = kzalloc(sizeof(*clk_data), GFP_KERNEL);
> -	if (WARN_ON(!clk_data))
> -		return;
> -
> -	clk_data->clks = kcalloc(num, sizeof(*clk_data->clks), GFP_KERNEL);
> -	if (!clk_data->clks)
> -		return;
> +	hw_data = kzalloc(struct_size(hw_data, hws, num), GFP_KERNEL);
> +	if (WARN_ON(!hw_data))
> +		goto unmap_io;
>  
>  	for (i = 0; i < num; i++) {
>  		struct hisi_mmc_clock *mmc_clk = &hi3620_mmc_clks[i];
> -		clk_data->clks[mmc_clk->id] =
> +		hw_data->hws[mmc_clk->id] =
>  			hisi_register_clk_mmc(mmc_clk, base, node);
>  	}
>  
> -	clk_data->clk_num = num;
> -	of_clk_add_provider(node, of_clk_src_onecell_get, clk_data);
> +	hw_data->num = num;
> +	ret = of_clk_add_hw_provider(node, of_clk_hw_onecell_get, hw_data);
> +	if (ret < 0)
> +		goto free_hw_data;
> +	return;
> +
> +free_hw_data:
> +	kfree(hw_data);
> +unmap_io:
> +	iounmap(base);
>  }
>  
>  CLK_OF_DECLARE(hi3620_mmc_clk, "hisilicon,hi3620-mmc-clock", hi3620_mmc_clk_init);
> diff --git a/drivers/clk/hisilicon/clk.c b/drivers/clk/hisilicon/clk.c
> index 54d9fdc93599..da655683710f 100644
> --- a/drivers/clk/hisilicon/clk.c
> +++ b/drivers/clk/hisilicon/clk.c
> @@ -65,25 +65,26 @@ struct hisi_clock_data *hisi_clk_init(struct device_node *np,
>  	base = of_iomap(np, 0);
>  	if (!base) {
>  		pr_err("%s: failed to map clock registers\n", __func__);
> -		goto err;
> +		return NULL;
>  	}
>  
>  	clk_data = kzalloc(sizeof(*clk_data), GFP_KERNEL);
>  	if (!clk_data)
> -		goto err;
> +		goto unmap_io;
>  
>  	clk_data->base = base;
>  	clk_table = kcalloc(nr_clks, sizeof(*clk_table), GFP_KERNEL);
>  	if (!clk_table)
> -		goto err_data;
> +		goto free_clk_data;
>  
>  	clk_data->clk_data.clks = clk_table;
>  	clk_data->clk_data.clk_num = nr_clks;
>  	of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data->clk_data);
>  	return clk_data;
> -err_data:
> +free_clk_data:
>  	kfree(clk_data);
> -err:
> +unmap_io:
> +	iounmap(base);
>  	return NULL;
>  }
>  EXPORT_SYMBOL_GPL(hisi_clk_init);
>