Commit 374a9140 authored Mar 31, 2014 by Rajat Jain Committed by Bjorn Helgaas Apr 24, 2014

PCI: Allow hotplug service drivers to operate in polling mode



Today the PCIe port bus driver disables the Hot-plug service if the port
device does not have the capability to generate interrupts.  However, a
user must be able to use the "pciehp_poll_mode" parameter to use the pciehp
in polling method in such a case.  Today it is not possible.

This patch allows a hotplug service driver to decide whether or not it
would like to continue in the absence of interrupts.

Signed-off-by: Rajat Jain <rajatxjain@gmail.com>
Signed-off-by: Rajat Jain <rajatjain@juniper.net>
Signed-off-by: Guenter Roeck <groeck@juniper.net>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

parent 476a357f

drivers/pci/pcie/portdrv_core.c

+4 −1

Original line number	Diff line number	Diff line
		@@ -379,10 +379,13 @@ int pcie_port_device_register(struct pci_dev *dev)
		/*
		* Initialize service irqs. Don't use service devices that
		* require interrupts if there is no way to generate them.
		* However, some drivers may have a polling mode (e.g. pciehp_poll_mode)
		* that can be used in the absence of irqs. Allow them to determine
		* if that is to be used.
		*/
		status = init_service_irqs(dev, irqs, capabilities);
		if (status) {
		capabilities &= PCIE_PORT_SERVICE_VC;
		capabilities &= PCIE_PORT_SERVICE_VC \| PCIE_PORT_SERVICE_HP;
		if (!capabilities)
		goto error_disable;
		}