[PATCH 4/5] PCI: Enable async shutdown support

[Bjorn Helgaas]

On Wed, Apr 29, 2026 at 01:50:15PM -0400, David Jeffery wrote:
> Like its async suspend support, allow PCI device shutdown to be performed
> asynchronously to reduce shutdown time.
> 
> Signed-off-by: David Jeffery <djeffery at redhat.com>
> Signed-off-by: Stuart Hayes <stuart.w.hayes at gmail.com>
> Tested-by: Laurence Oberman <loberman at redhat.com>
> Reviewed-by: Martin K. Petersen <martin.petersen at oracle.com>
> Reviewed-by: Pasha Tatashin <pasha.tatashin at soleen.com>

Reviewed-by: Bjorn Helgaas <bhelgaas at google.com>

I'm concerned about tripping over driver issues, but it's a pretty big
benefit.  I think it's worth mentioning the "async_shutdown" module
parameter somewhere in the commit logs and putting an example in
Documentation/admin-guide/kernel-parameters.txt.

Might even consider keeping in -next for a cycle+ and targeting v7.3.

> ---
>  drivers/pci/probe.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index b63cd0c310bc..86e855090553 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -1045,6 +1045,7 @@ static int pci_register_host_bridge(struct pci_host_bridge *bridge)
>  
>  	bus->bridge = get_device(&bridge->dev);
>  	device_enable_async_suspend(bus->bridge);
> +	device_enable_async_shutdown(bus->bridge);
>  	pci_set_bus_of_node(bus);
>  	pci_set_bus_msi_domain(bus);
>  	if (bridge->msi_domain && !dev_get_msi_domain(&bus->dev) &&
> @@ -2753,6 +2754,7 @@ void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
>  	pci_reassigndev_resource_alignment(dev);
>  
>  	pci_init_capabilities(dev);
> +	device_enable_async_shutdown(&dev->dev);
>  
>  	/*
>  	 * Add the device to our list of discovered devices
> -- 
> 2.53.0
>