linux-kernel - Re: [PATCH v3 1/2] perf/dwc_pcie: fix some unreleased resources

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Message-ID: <d1db3047-f478-4d8f-b9f6-e7a5820d5a29@linux.alibaba.com>
Date: Tue, 11 Feb 2025 16:05:06 +0800
From: Shuai Xue <xueshuai@...ux.alibaba.com>
To: Yunhui Cui <cuiyunhui@...edance.com>, renyu.zj@...ux.alibaba.com,
 will@...nel.org, mark.rutland@....com, linux-arm-kernel@...ts.infradead.org,
 linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
 Bjorn Helgaas <bhelgaas@...gle.com>,
 Jonathan Cameron <Jonathan.Cameron@...wei.com>, linux-pci@...r.kernel.org
Subject: Re: [PATCH v3 1/2] perf/dwc_pcie: fix some unreleased resources



在 2025/2/8 18:40, Yunhui Cui 写道:
> Release leaked resources, such as plat_dev and dev_info.
> 
> Signed-off-by: Yunhui Cui <cuiyunhui@...edance.com>
> ---
>   drivers/perf/dwc_pcie_pmu.c | 33 ++++++++++++++++++++++-----------
>   1 file changed, 22 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/perf/dwc_pcie_pmu.c b/drivers/perf/dwc_pcie_pmu.c
> index cccecae9823f..19fa2ba8dd67 100644
> --- a/drivers/perf/dwc_pcie_pmu.c
> +++ b/drivers/perf/dwc_pcie_pmu.c
> @@ -572,8 +572,10 @@ static int dwc_pcie_register_dev(struct pci_dev *pdev)
>   		return PTR_ERR(plat_dev);
>   
>   	dev_info = kzalloc(sizeof(*dev_info), GFP_KERNEL);
> -	if (!dev_info)
> +	if (!dev_info) {
> +		platform_device_unregister(plat_dev);
>   		return -ENOMEM;
> +	}
>   
>   	/* Cache platform device to handle pci device hotplug */
>   	dev_info->plat_dev = plat_dev;
> @@ -730,6 +732,15 @@ static struct platform_driver dwc_pcie_pmu_driver = {
>   	.driver = {.name = "dwc_pcie_pmu",},
>   };
>   
> +static void dwc_pcie_cleanup_devices(void)
> +{
> +	struct dwc_pcie_dev_info *dev_info, *tmp;
> +
> +	list_for_each_entry_safe(dev_info, tmp, &dwc_pcie_dev_info_head, dev_node) {
> +		dwc_pcie_unregister_dev(dev_info);
> +	}
> +}
> +
>   static int __init dwc_pcie_pmu_init(void)
>   {
>   	struct pci_dev *pdev = NULL;
> @@ -742,7 +753,7 @@ static int __init dwc_pcie_pmu_init(void)
>   		ret = dwc_pcie_register_dev(pdev);
>   		if (ret) {
>   			pci_dev_put(pdev);

Should we get a reference count of pdev in dwc_pcie_register_dev and put it in
dwc_pcie_unregister_dev?

Thanks.
Shuai