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Thu, 20 Feb 2025 04:18:06 -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 v4 2/2] perf/dwc_pcie: fix duplicate pci_dev devices Date: Thu, 20 Feb 2025 20:17:16 +0800 Message-Id: <20250220121716.50324-3-cuiyunhui@bytedance.com> X-Mailer: git-send-email 2.39.2 (Apple Git-143) In-Reply-To: <20250220121716.50324-1-cuiyunhui@bytedance.com> References: <20250220121716.50324-1-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" During platform_device_register, wrongly using struct device pci_dev as platform_data caused a kmemdup copy of pci_dev. Worse still, accessing the duplicated device leads to list corruption as its mutex content (e.g., list, magic) remains the same as the original. Signed-off-by: Yunhui Cui Reviewed-by: Shuai Xue --- drivers/perf/dwc_pcie_pmu.c | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-) diff --git a/drivers/perf/dwc_pcie_pmu.c b/drivers/perf/dwc_pcie_pmu.c index 19fa2ba8dd67..f851e070760c 100644 --- a/drivers/perf/dwc_pcie_pmu.c +++ b/drivers/perf/dwc_pcie_pmu.c @@ -565,9 +565,7 @@ static int dwc_pcie_register_dev(struct pci_dev *pdev) u32 sbdf; =20 sbdf =3D (pci_domain_nr(pdev->bus) << 16) | PCI_DEVID(pdev->bus->number, = pdev->devfn); - plat_dev =3D platform_device_register_data(NULL, "dwc_pcie_pmu", sbdf, - pdev, sizeof(*pdev)); - + plat_dev =3D platform_device_register_simple("dwc_pcie_pmu", sbdf, NULL, = 0); if (IS_ERR(plat_dev)) return PTR_ERR(plat_dev); =20 @@ -616,18 +614,26 @@ static struct notifier_block dwc_pcie_pmu_nb =3D { =20 static int dwc_pcie_pmu_probe(struct platform_device *plat_dev) { - struct pci_dev *pdev =3D plat_dev->dev.platform_data; + struct pci_dev *pdev; struct dwc_pcie_pmu *pcie_pmu; char *name; u32 sbdf; u16 vsec; int ret; =20 + sbdf =3D plat_dev->id; + pdev =3D pci_get_domain_bus_and_slot(sbdf >> 16, PCI_BUS_NUM(sbdf & 0xfff= f), + sbdf & 0xff); + if (!pdev) { + pr_err("No pdev found for the sbdf 0x%x\n", sbdf); + return -ENODEV; + } + vsec =3D dwc_pcie_des_cap(pdev); if (!vsec) return -ENODEV; =20 - sbdf =3D plat_dev->id; + pci_dev_put(pdev); name =3D devm_kasprintf(&plat_dev->dev, GFP_KERNEL, "dwc_rootport_%x", sb= df); if (!name) return -ENOMEM; @@ -642,7 +648,7 @@ static int dwc_pcie_pmu_probe(struct platform_device *p= lat_dev) pcie_pmu->on_cpu =3D -1; pcie_pmu->pmu =3D (struct pmu){ .name =3D name, - .parent =3D &pdev->dev, + .parent =3D &plat_dev->dev, .module =3D THIS_MODULE, .attr_groups =3D dwc_pcie_attr_groups, .capabilities =3D PERF_PMU_CAP_NO_EXCLUDE, --=20 2.39.2