From: Hans Zhang <18255117159@163.com> Date: Thu, 21 May 2026 16:18:19 +0000 (+0800) Subject: PCI: mediatek: Protect root bus removal with rescan lock X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a29812a55da8d0dbeb071b26ac428c338e3fc389;p=thirdparty%2Flinux.git PCI: mediatek: Protect root bus removal with rescan lock Hold the pci_rescan_remove_lock lock while stopping and removing a root bus to avoid racing with concurrent rescan or hotplug operations triggered via sysfs. Such races may lead to use-after-free issues or system crashes. Signed-off-by: Hans Zhang <18255117159@163.com> Signed-off-by: Manivannan Sadhasivam [bhelgaas: commit log] Signed-off-by: Bjorn Helgaas Link: https://patch.msgid.link/20260521161822.132996-7-18255117159@163.com --- diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c index 75722524fe74..2fedb6d2939d 100644 --- a/drivers/pci/controller/pcie-mediatek.c +++ b/drivers/pci/controller/pcie-mediatek.c @@ -1172,8 +1172,10 @@ static void mtk_pcie_remove(struct platform_device *pdev) struct mtk_pcie *pcie = platform_get_drvdata(pdev); struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie); + pci_lock_rescan_remove(); pci_stop_root_bus(host->bus); pci_remove_root_bus(host->bus); + pci_unlock_rescan_remove(); mtk_pcie_free_resources(pcie); mtk_pcie_irq_teardown(pcie);