[PATCH 3/9] PCI: altera: Protect root bus removal with rescan lock

[Hans Zhang]

In altera_pcie_remove(), wrap pci_stop_root_bus() and
pci_remove_root_bus() with pci_lock_rescan_remove() /
pci_unlock_rescan_remove() to avoid potential races with
sysfs-triggered rescans.

Signed-off-by: Hans Zhang <18255117159@xxxxxxx>
---
 drivers/pci/controller/pcie-altera.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/pci/controller/pcie-altera.c b/drivers/pci/controller/pcie-altera.c
index 3dbb7adc421c..7e1db267ae34 100644
--- a/drivers/pci/controller/pcie-altera.c
+++ b/drivers/pci/controller/pcie-altera.c
@@ -1045,8 +1045,10 @@ static void altera_pcie_remove(struct platform_device *pdev)
 	struct altera_pcie *pcie = platform_get_drvdata(pdev);
 	struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie);
 
+	pci_lock_rescan_remove();
 	pci_stop_root_bus(bridge->bus);
 	pci_remove_root_bus(bridge->bus);
+	pci_unlock_rescan_remove();
 	altera_pcie_irq_teardown(pcie);
 }
 
-- 
2.34.1