linux-kernel - Re: [PATCH] drivers/perf: Fix kernel panic when rmmod PMU modules during perf sampling

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Date:   Thu, 16 Jul 2020 10:41:44 +0100
From:   Will Deacon <will@...nel.org>
To:     Qi Liu <liuqi115@...wei.com>
Cc:     john.garry@...wei.com, zhangshaokun@...ilicon.com,
        mark.rutland@....com, wang.wanghaifeng@...wei.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linuxarm@...wei.com
Subject: Re: [PATCH] drivers/perf: Fix kernel panic when rmmod PMU modules
 during perf sampling

On Thu, Jul 16, 2020 at 05:19:25PM +0800, Qi Liu wrote:
> Kernel panic will also happen when users try to unbind PMU drivers with
> device. This unbind issue could be solved by another patch latter.
> 
>  drivers/perf/arm_smmuv3_pmu.c                 | 1 +
>  drivers/perf/fsl_imx8_ddr_perf.c              | 1 +
>  drivers/perf/hisilicon/hisi_uncore_ddrc_pmu.c | 1 +
>  drivers/perf/hisilicon/hisi_uncore_hha_pmu.c  | 1 +
>  drivers/perf/hisilicon/hisi_uncore_l3c_pmu.c  | 1 +
>  5 files changed, 5 insertions(+)
> 
> diff --git a/drivers/perf/arm_smmuv3_pmu.c b/drivers/perf/arm_smmuv3_pmu.c
> index 48e28ef..90caba56 100644
> --- a/drivers/perf/arm_smmuv3_pmu.c
> +++ b/drivers/perf/arm_smmuv3_pmu.c
> @@ -742,6 +742,7 @@ static int smmu_pmu_probe(struct platform_device *pdev)
>  	platform_set_drvdata(pdev, smmu_pmu);
> 
>  	smmu_pmu->pmu = (struct pmu) {
> +		.module		= THIS_MODULE,

I thought platform_driver_register() did this automatically?

Will