From 1302fcf0d03e6ea74846c7fee14736306ab2ce4b Mon Sep 17 00:00:00 2001 From: Bjorn Helgaas Date: Sat, 30 Aug 2014 07:23:01 -0600 Subject: [PATCH] PCI: Configure *all* devices, not just hot-added ones There's not really a good way to determine whether firmware has already configured a device with _HPP/_HPX settings. On legacy systems, the BIOS has probably configured everything, but on UEFI systems it is not required to do so. Per the PCI Firmware Specification, rev 3.1, sec 3.5, if PCI_COMMAND_IO or PCI_COMMAND_MEMORY is set, we can assume firmware has set the corresponding BARs and maybe we can assume it has configured the rest of the device. And if a bridge has PCI_COMMAND_PARITY or PCI_COMMAND_SERR set, we can assume firmware has configured the bridge. But we can't tell much about devices without BARs. I think it should be safe to apply _HPP and _HPX settings anyway, even if firmware has already configured the device, so configure everything we find. Signed-off-by: Bjorn Helgaas Acked-by: Yinghai Lu --- drivers/pci/probe.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index cb411fbb6435..290c657da0b9 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -1358,9 +1358,6 @@ static void pci_configure_device(struct pci_dev *dev) struct hotplug_params hpp; int ret; - if (system_state == SYSTEM_BOOTING) - return; - memset(&hpp, 0, sizeof(hpp)); ret = pci_get_hp_params(dev, &hpp); if (ret) -- GitLab