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Tue, 04 Feb 2025 19:14:40 -0800 (PST) From: Yunhui Cui To: xueshuai@linux.alibaba.com, renyu.zj@linux.alibaba.com, will@kernel.org, mark.rutland@arm.com, linux-arm-kernel@lists.infradead.org, linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Yunhui Cui Subject: [PATCH v2 1/2] perf/dwc_pcie: fix the incorrect reference count Date: Wed, 5 Feb 2025 11:14:24 +0800 Message-Id: <20250205031425.67265-2-cuiyunhui@bytedance.com> X-Mailer: git-send-email 2.39.2 (Apple Git-143) In-Reply-To: <20250205031425.67265-1-cuiyunhui@bytedance.com> References: <20250205031425.67265-1-cuiyunhui@bytedance.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" for_each_pci_dev increments pdev refcount. Call pci_dev_put after access to decrement it. Signed-off-by: Yunhui Cui --- drivers/perf/dwc_pcie_pmu.c | 42 ++++++++++++++++++++++++++----------- 1 file changed, 30 insertions(+), 12 deletions(-) diff --git a/drivers/perf/dwc_pcie_pmu.c b/drivers/perf/dwc_pcie_pmu.c index cccecae9823f..4ac53167d7ab 100644 --- a/drivers/perf/dwc_pcie_pmu.c +++ b/drivers/perf/dwc_pcie_pmu.c @@ -553,6 +553,7 @@ static u16 dwc_pcie_des_cap(struct pci_dev *pdev) =20 static void dwc_pcie_unregister_dev(struct dwc_pcie_dev_info *dev_info) { + pci_dev_put(dev_info->pdev); platform_device_unregister(dev_info->plat_dev); list_del(&dev_info->dev_node); kfree(dev_info); @@ -572,8 +573,10 @@ static int dwc_pcie_register_dev(struct pci_dev *pdev) return PTR_ERR(plat_dev); =20 dev_info =3D kzalloc(sizeof(*dev_info), GFP_KERNEL); - if (!dev_info) + if (!dev_info) { + platform_device_unregister(plat_dev); return -ENOMEM; + } =20 /* Cache platform device to handle pci device hotplug */ dev_info->plat_dev =3D plat_dev; @@ -594,8 +597,11 @@ static int dwc_pcie_pmu_notifier(struct notifier_block= *nb, case BUS_NOTIFY_ADD_DEVICE: if (!dwc_pcie_des_cap(pdev)) return NOTIFY_DONE; - if (dwc_pcie_register_dev(pdev)) + pci_dev_get(pdev); + if (dwc_pcie_register_dev(pdev)) { + pci_dev_put(pdev); return NOTIFY_BAD; + } break; case BUS_NOTIFY_DEL_DEVICE: dev_info =3D dwc_pcie_find_dev_info(pdev); @@ -730,20 +736,29 @@ static struct platform_driver dwc_pcie_pmu_driver =3D= { .driver =3D {.name =3D "dwc_pcie_pmu",}, }; =20 +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 =3D NULL; int ret; =20 for_each_pci_dev(pdev) { - if (!dwc_pcie_des_cap(pdev)) + if (!dwc_pcie_des_cap(pdev)) { + pci_dev_put(pdev); continue; + } =20 ret =3D dwc_pcie_register_dev(pdev); - if (ret) { - pci_dev_put(pdev); - return ret; - } + if (ret) + goto err_cleanup; } =20 ret =3D cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, @@ -751,24 +766,27 @@ static int __init dwc_pcie_pmu_init(void) dwc_pcie_pmu_online_cpu, dwc_pcie_pmu_offline_cpu); if (ret < 0) - return ret; + goto err_cleanup; =20 dwc_pcie_pmu_hp_state =3D ret; =20 ret =3D platform_driver_register(&dwc_pcie_pmu_driver); if (ret) - goto platform_driver_register_err; + goto err_remove_cpuhp; =20 ret =3D bus_register_notifier(&pci_bus_type, &dwc_pcie_pmu_nb); if (ret) - goto platform_driver_register_err; + goto err_unregister_driver; notify =3D true; =20 return 0; =20 -platform_driver_register_err: +err_unregister_driver: + platform_driver_unregister(&dwc_pcie_pmu_driver); +err_remove_cpuhp: cpuhp_remove_multi_state(dwc_pcie_pmu_hp_state); - +err_cleanup: + dwc_pcie_cleanup_devices(); return ret; } =20 --=20 2.39.2