[PATCH 2/9] PCI: dwc: Protect root bus removal with rescan lock

[Hans Zhang]

Add pci_lock_rescan_remove() / pci_unlock_rescan_remove() around
pci_stop_root_bus() and pci_remove_root_bus() in dw_pcie_host_deinit()
to prevent race conditions with concurrent PCI rescan or hotplug.

Signed-off-by: Hans Zhang <18255117159@xxxxxxx>
---
 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);
 
-- 
2.34.1