From 26335696498ab502e907a556e97c7039bc80a87e Mon Sep 17 00:00:00 2001 From: Hans Zhang <18255117159@163.com> Date: Fri, 22 May 2026 00:18:15 +0800 Subject: [PATCH] PCI: dwc: 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/20260521161822.132996-3-18255117159@163.com --- drivers/pci/controller/dwc/pcie-designware-host.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c index c9517a348836..f856ac2fb15d 100644 --- a/drivers/pci/controller/dwc/pcie-designware-host.c +++ b/drivers/pci/controller/dwc/pcie-designware-host.c @@ -703,8 +703,10 @@ void dw_pcie_host_deinit(struct dw_pcie_rp *pp) dwc_pcie_debugfs_deinit(pci); + pci_lock_rescan_remove(); pci_stop_root_bus(pp->bridge->bus); pci_remove_root_bus(pp->bridge->bus); + pci_unlock_rescan_remove(); dw_pcie_stop_link(pci);