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>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c
index 986f8eadfd39..f6503add2f35 100644
--- a/drivers/pci/pcie/portdrv_core.c
+++ b/drivers/pci/pcie/portdrv_core.c
@@ -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;
         }