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PCI: mediatek: 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/20260521161822.132996-7-18255117159@163.com
This commit is contained in:
Hans Zhang 2026-05-22 00:18:19 +08:00 committed by Bjorn Helgaas
parent a6a64e150f
commit a29812a55d
1 changed files with 2 additions and 0 deletions
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2
drivers/pci/controller/pcie-mediatek.c
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@ -1172,8 +1172,10 @@ static void mtk_pcie_remove(struct platform_device *pdev)
struct mtk_pcie *pcie = platform_get_drvdata(pdev);
struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
pci_lock_rescan_remove();
pci_stop_root_bus(host->bus);
pci_remove_root_bus(host->bus);
pci_unlock_rescan_remove();
mtk_pcie_free_resources(pcie);
mtk_pcie_irq_teardown(pcie);