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authorBjorn Helgaas <bhelgaas@google.com>2013-12-19 03:31:39 +0400
committerBjorn Helgaas <bhelgaas@google.com>2014-01-08 03:24:33 +0400
commit36e097a8a29761e0e2c951c0390f1057df248a87 (patch)
tree871b8d7d1a029f3cf0e1deaa648c813738b9bbea /drivers/pci/bus.c
parent167b1f049008b367a9003a6a8df090af4282a6b0 (diff)
downloadlinux-36e097a8a29761e0e2c951c0390f1057df248a87.tar.xz
PCI: Split out bridge window override of minimum allocation address
pci_bus_alloc_resource() avoids allocating space below the "min" supplied by the caller (usually PCIBIOS_MIN_IO or PCIBIOS_MIN_MEM). This is to protect badly documented motherboard resources. But if we're allocating space inside an already-configured PCI-PCI bridge window, we ignore "min". See 688d191821de ("pci: make bus resource start address override minimum IO address"). This patch moves the check to make it more visible and simplify future patches. No functional change. Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/pci/bus.c')
-rw-r--r--drivers/pci/bus.c15
1 files changed, 11 insertions, 4 deletions
diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
index fc1b74013743..6f2f47a7b6c6 100644
--- a/drivers/pci/bus.c
+++ b/drivers/pci/bus.c
@@ -147,11 +147,18 @@ pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
!(res->flags & IORESOURCE_PREFETCH))
continue;
+ /*
+ * "min" is typically PCIBIOS_MIN_IO or PCIBIOS_MIN_MEM to
+ * protect badly documented motherboard resources, but if
+ * this is an already-configured bridge window, its start
+ * overrides "min".
+ */
+ if (r->start)
+ min = r->start;
+
/* Ok, try it out.. */
- ret = allocate_resource(r, res, size,
- r->start ? : min,
- max, align,
- alignf, alignf_data);
+ ret = allocate_resource(r, res, size, min, max,
+ align, alignf, alignf_data);
if (ret == 0)
break;
}