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PCI: dwc: Protect root bus removal with rescan lock

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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 <mani@kernel.org>
[bhelgaas: commit log]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://patch.msgid.link/20260521161822.132996-3-18255117159@163.com
This commit is contained in:
Hans Zhang 2026-05-22 00:18:15 +08:00 committed by Bjorn Helgaas
parent 713331969c
commit 2633569649
1 changed files with 2 additions and 0 deletions
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2
drivers/pci/controller/dwc/pcie-designware-host.c
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@ -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);