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Message-ID: <2f85025e-f072-e01c-cb57-6a0a65a3cb0d@huawei.com>
Date: Thu, 12 Nov 2020 18:59:32 +0800
From: Dongjiu Geng <gengdongjiu@...wei.com>
To: <mturquette@...libre.com>, <sboyd@...nel.org>,
<Markus.Elfring@....de>, <linux-clk@...r.kernel.org>,
<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V3] clk: hisilicon: refine hi3620_mmc_clk_init() and fix
memory leak issues
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@....de>
> Signed-off-by: Dongjiu Geng <gengdongjiu@...wei.com>
> ---
> 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);
>
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