[RFC PATCH 01/16] PCI: Enhance pci_scan_root_bus() to support default IO/MEM resources
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STALE4355d
From: Yijing Wang <hidden>
Date: 2014-11-17 09:43:46
Also in:
linux-arm-kernel, linux-pci, lkml
Subsystem:
pci subsystem, the rest · Maintainers:
Bjorn Helgaas, Linus Torvalds
From: Yijing Wang <redacted> Pci_scan_root_bus(), pci_scan_bus() and pci_scan_bus_parented() are very similar. But the latter two use the default io/mem resources. Enhance pci_scan_root_bus() to support default io/mem resources, then we could use pci_scan_root_bus() instead of them, and clean them up. Signed-off-by: Yijing Wang <redacted> --- drivers/pci/probe.c | 20 ++++++++++++++------ 1 files changed, 14 insertions(+), 6 deletions(-)
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 5ed9930..fc99e88 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c@@ -2069,15 +2069,23 @@ struct pci_bus *pci_scan_root_bus(struct device *parent, int bus, struct pci_host_bridge_window *window; bool found = false; struct pci_bus *b; + LIST_HEAD(default_res); int max; - list_for_each_entry(window, resources, list) - if (window->res->flags & IORESOURCE_BUS) { - found = true; - break; - } + if (!resources) { + pci_add_resource(&default_res, &ioport_resource); + pci_add_resource(&default_res, &iomem_resource); + pci_add_resource(&default_res, &busn_resource); + } else { + list_for_each_entry(window, resources, list) + if (window->res->flags & IORESOURCE_BUS) { + found = true; + break; + } + } - b = pci_create_root_bus(parent, bus, ops, sysdata, resources); + b = pci_create_root_bus(parent, bus, ops, sysdata, + resources ? resources : &default_res); if (!b) return NULL;
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1.7.1