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Date: Mon, 2 Aug 2021 10:17:24 -0400
From: Sean Anderson <seanga2@...il.com>
To: Damien Le Moal <Damien.LeMoal@....com>,
Dan Carpenter <dan.carpenter@...cle.com>,
"kbuild@...ts.01.org" <kbuild@...ts.01.org>
Cc: "lkp@...el.com" <lkp@...el.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Palmer Dabbelt <palmerdabbelt@...gle.com>,
Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [kbuild] drivers/pinctrl/pinctrl-k210.c:970 k210_fpioa_probe()
warn: 'pdata->clk' not released on lines: 962,968.
On 8/1/21 6:50 PM, Damien Le Moal wrote:
> On 2021/07/30 22:46, Dan Carpenter wrote:
>> tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>> head: 764a5bc89b12b82c18ce7ca5d7c1b10dd748a440
>> commit: d4c34d09ab03e1e631fe195ddf35365a1273be9c pinctrl: Add RISC-V Canaan Kendryte K210 FPIOA driver
>> config: riscv-randconfig-m031-20210730 (attached as .config)
>> compiler: riscv64-linux-gcc (GCC) 10.3.0
>>
>> If you fix the issue, kindly add following tag as appropriate
>> Reported-by: kernel test robot <lkp@...el.com>
>> Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
>>
>> smatch warnings:
>> drivers/pinctrl/pinctrl-k210.c:970 k210_fpioa_probe() warn: 'pdata->clk' not released on lines: 962,968.
>>
>> vim +970 drivers/pinctrl/pinctrl-k210.c
>>
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 925 static int k210_fpioa_probe(struct platform_device *pdev)
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 926 {
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 927 struct device *dev = &pdev->dev;
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 928 struct device_node *np = dev->of_node;
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 929 struct k210_fpioa_data *pdata;
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 930 int ret;
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 931
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 932 dev_info(dev, "K210 FPIOA pin controller\n");
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 933
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 934 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 935 if (!pdata)
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 936 return -ENOMEM;
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 937
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 938 pdata->dev = dev;
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 939 platform_set_drvdata(pdev, pdata);
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 940
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 941 pdata->fpioa = devm_platform_ioremap_resource(pdev, 0);
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 942 if (IS_ERR(pdata->fpioa))
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 943 return PTR_ERR(pdata->fpioa);
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 944
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 945 pdata->clk = devm_clk_get(dev, "ref");
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 946 if (IS_ERR(pdata->clk))
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 947 return PTR_ERR(pdata->clk);
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 948
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 949 ret = clk_prepare_enable(pdata->clk);
>> ^^^^^^^^^^^^^^^^^^
>>
>>
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 950 if (ret)
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 951 return ret;
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 952
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 953 pdata->pclk = devm_clk_get_optional(dev, "pclk");
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 954 if (!IS_ERR(pdata->pclk))
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 955 clk_prepare_enable(pdata->pclk);
>> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>> No error handling
>>
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 956
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 957 pdata->sysctl_map =
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 958 syscon_regmap_lookup_by_phandle_args(np,
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 959 "canaan,k210-sysctl-power",
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 960 1, &pdata->power_offset);
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 961 if (IS_ERR(pdata->sysctl_map))
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 962 return PTR_ERR(pdata->sysctl_map);
>>
>> Do we need to clk_unprepare_disable() before returning?
>>
>>
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 963
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 964 k210_fpioa_init_ties(pdata);
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 965
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 966 pdata->pctl = pinctrl_register(&k210_pinctrl_desc, dev, (void *)pdata);
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 967 if (IS_ERR(pdata->pctl))
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 968 return PTR_ERR(pdata->pctl);
>>
>> Here too.
>
> I can add the clk_unprepare_disable() call to avoid the warning, but that is
> rather pointless as the system will not boot at all if there is an error here.
> Thoughts ?
IMO, you should still handle the error so the user gets some warning
about not being able to enable the clock instead of crashing at some
later point.
--Sean
>
>>
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 969
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 @970 return 0;
>> d4c34d09ab03e1 Damien Le Moal 2021-01-12 971 }
>>
>> ---
>> 0-DAY CI Kernel Test Service, Intel Corporation
>> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
>>
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