add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/pci/hotplug/pciehp_pci.c
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@@ -63,7 +63,14 @@
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 	pci_assign_unassigned_bridge_resources(bridge);
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 	pcie_bus_configure_settings(parent);
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+
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+	/*
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+	 * Release reset_lock during driver binding
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+	 * to avoid AB-BA deadlock with device_lock.
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+	 */
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+	up_read(&ctrl->reset_lock);
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 	pci_bus_add_devices(parent);
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+	down_read_nested(&ctrl->reset_lock, ctrl->depth);
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  out:
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 	pci_unlock_rescan_remove();
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@@ -104,7 +111,15 @@
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 	list_for_each_entry_safe_reverse(dev, temp, &parent->devices,
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 					 bus_list) {
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 		pci_dev_get(dev);
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+
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+		/*
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+		 * Release reset_lock during driver unbinding
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+		 * to avoid AB-BA deadlock with device_lock.
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+		 */
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+		up_read(&ctrl->reset_lock);
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 		pci_stop_and_remove_bus_device(dev);
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+		down_read_nested(&ctrl->reset_lock, ctrl->depth);
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+
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 		/*
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 		 * Ensure that no new Requests will be generated from
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 		 * the device.