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SubjectRe: [PATCH] clk: imx: clk-imx8mp: improve error handling in imx8mp_clocks_probe()
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ping?

在 2023/5/3 15:06, Yuxing Liu 写道:
> Replace of_iomap() and kzalloc() with devm_of_iomap() and devm_kzalloc()
> which can automatically release the related memory when the device
> or driver is removed or unloaded to avoid potential memory leak.
>
> In this case, iounmap(anatop_base) in line 427,433 are removed
> as manual release is not required.
>
> Besides, referring to clk-imx8mq.c, check the return code of
> of_clk_add_hw_provider, if it returns negtive, print error info
> and unregister hws, which makes the program more robust.
>
> Fixes: 9c140d992676 ("clk: imx: Add support for i.MX8MP clock driver")
> Signed-off-by: Yuxing Liu <lyx2022@hust.edu.cn>
> Reviewed-by: Dongliang Mu <dzm91@hust.edu.cn>
> ---
> This issue is found by static analysis and remains untested.
> ---
> drivers/clk/imx/clk-imx8mp.c | 24 +++++++++++++-----------
> 1 file changed, 13 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/clk/imx/clk-imx8mp.c b/drivers/clk/imx/clk-imx8mp.c
> index 3253589851ff..de7d2d2176be 100644
> --- a/drivers/clk/imx/clk-imx8mp.c
> +++ b/drivers/clk/imx/clk-imx8mp.c
> @@ -414,25 +414,22 @@ static int imx8mp_clocks_probe(struct platform_device *pdev)
> struct device *dev = &pdev->dev;
> struct device_node *np;
> void __iomem *anatop_base, *ccm_base;
> + int err;
>
> np = of_find_compatible_node(NULL, NULL, "fsl,imx8mp-anatop");
> - anatop_base = of_iomap(np, 0);
> + anatop_base = devm_of_iomap(dev, np, 0, NULL);
> of_node_put(np);
> - if (WARN_ON(!anatop_base))
> - return -ENOMEM;
> + if (WARN_ON(IS_ERR(anatop_base)))
> + return PTR_ERR(anatop_base);
>
> np = dev->of_node;
> ccm_base = devm_platform_ioremap_resource(pdev, 0);
> - if (WARN_ON(IS_ERR(ccm_base))) {
> - iounmap(anatop_base);
> + if (WARN_ON(IS_ERR(ccm_base)))
> return PTR_ERR(ccm_base);
> - }
>
> - clk_hw_data = kzalloc(struct_size(clk_hw_data, hws, IMX8MP_CLK_END), GFP_KERNEL);
> - if (WARN_ON(!clk_hw_data)) {
> - iounmap(anatop_base);
> + clk_hw_data = devm_kzalloc(dev, struct_size(clk_hw_data, hws, IMX8MP_CLK_END), GFP_KERNEL);
> + if (WARN_ON(!clk_hw_data))
> return -ENOMEM;
> - }
>
> clk_hw_data->num = IMX8MP_CLK_END;
> hws = clk_hw_data->hws;
> @@ -721,7 +718,12 @@ static int imx8mp_clocks_probe(struct platform_device *pdev)
>
> imx_check_clk_hws(hws, IMX8MP_CLK_END);
>
> - of_clk_add_hw_provider(np, of_clk_hw_onecell_get, clk_hw_data);
> + err = of_clk_add_hw_provider(np, of_clk_hw_onecell_get, clk_hw_data);
> + if (err < 0) {
> + dev_err(dev, "failed to register hws for i.MX8MP\n");
> + imx_unregister_hw_clocks(hws, IMX8MP_CLK_END);
> + return err;
> + }
>
> imx_register_uart_clocks();
>

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