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PCI: cadence: 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/20260521161822.132996-2-18255117159@163.com
This commit is contained in:
Hans Zhang 2026-05-22 00:18:14 +08:00 committed by Bjorn Helgaas
parent 20b7aba83c
commit 713331969c
1 changed files with 2 additions and 0 deletions
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2
drivers/pci/controller/cadence/pcie-cadence-host.c
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@ -365,8 +365,10 @@ void cdns_pcie_host_disable(struct cdns_pcie_rc *rc)
struct pci_host_bridge *bridge;
bridge = pci_host_bridge_from_priv(rc);
pci_lock_rescan_remove();
pci_stop_root_bus(bridge->bus);
pci_remove_root_bus(bridge->bus);
pci_unlock_rescan_remove();
cdns_pcie_host_deinit(rc);
cdns_pcie_host_link_disable(rc);