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SubjectRe: [PATCH 1/2] PM / devfreq: rk3399_dmc: Add missing devfreq_event_disable_edev
Hi,

2019년 12월 22일 (일) 오전 3:21, Yangtao Li <tiny.windzz@gmail.com>님이 작성:
>
> The probe process may fail, but the devfreq event device remains
> enabled. Call devfreq_event_disable_edev on the error return path.
>
> Signed-off-by: Yangtao Li <tiny.windzz@gmail.com>
> ---
> drivers/devfreq/rk3399_dmc.c | 17 ++++++++++++-----
> 1 file changed, 12 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/devfreq/rk3399_dmc.c b/drivers/devfreq/rk3399_dmc.c
> index 2f1027c5b647..4f4e7c041888 100644
> --- a/drivers/devfreq/rk3399_dmc.c
> +++ b/drivers/devfreq/rk3399_dmc.c
> @@ -364,7 +364,8 @@ static int rk3399_dmcfreq_probe(struct platform_device *pdev)
> if (res.a0) {
> dev_err(dev, "Failed to set dram param: %ld\n",
> res.a0);
> - return -EINVAL;
> + ret = -EINVAL;
> + goto err_disable_edev;

After jumping err_disable_edev, it calls the dev_pm_opp_of_remove_table().
it is wrong. It doesn't need to remove the table.

> }
> }
> }
> @@ -373,8 +374,10 @@ static int rk3399_dmcfreq_probe(struct platform_device *pdev)
> if (node) {
> data->regmap_pmu = syscon_node_to_regmap(node);
> of_node_put(node);
> - if (IS_ERR(data->regmap_pmu))
> - return PTR_ERR(data->regmap_pmu);
> + if (IS_ERR(data->regmap_pmu)) {
> + ret = PTR_ERR(data->regmap_pmu);
> + goto err_disable_edev;

ditto.

After jumping err_disable_edev, it calls the dev_pm_opp_of_remove_table().
it is wrong. It doesn't need to remove the table.

> + }
> }
>
> regmap_read(data->regmap_pmu, RK3399_PMUGRF_OS_REG2, &val);
> @@ -392,7 +395,8 @@ static int rk3399_dmcfreq_probe(struct platform_device *pdev)
> data->odt_dis_freq = data->timing.lpddr4_odt_dis_freq;
> break;
> default:
> - return -EINVAL;
> + ret = -EINVAL;
> + goto err_disable_edev;

ditto.

> };
>
> arm_smccc_smc(ROCKCHIP_SIP_DRAM_FREQ, 0, 0,
> @@ -426,7 +430,8 @@ static int rk3399_dmcfreq_probe(struct platform_device *pdev)
> */
> if (dev_pm_opp_of_add_table(dev)) {
> dev_err(dev, "Invalid operating-points in device tree.\n");
> - return -EINVAL;
> + ret = -EINVAL;
> + goto err_disable_edev;

ditto.

> }
>
> of_property_read_u32(np, "upthreshold",
> @@ -464,6 +469,8 @@ static int rk3399_dmcfreq_probe(struct platform_device *pdev)
>
> return 0;
>
> +err_disable_edev:
> + devfreq_event_disable_edev(data->edev);

It is wrong. It have to be called under dev_pm_opp_of_remove_table().
It ignores the sequence of exception handling.

> err_free_opp:
> dev_pm_opp_of_remove_table(&pdev->dev);
> return ret;
> --
> 2.17.1
>


--
Best Regards,
Chanwoo Choi

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