summaryrefslogtreecommitdiffstats
path: root/drivers/pci/bus.c
diff options
context:
space:
mode:
authorBjorn Helgaas <bhelgaas@google.com>2014-03-10 10:46:56 -0600
committerBjorn Helgaas <bhelgaas@google.com>2014-03-19 15:00:16 -0600
commite20fa6609a0076def469aeb799b1c25558e70042 (patch)
tree7655a6a74f2fc9209e723af10e1b72ac7f127c04 /drivers/pci/bus.c
parentd75332325389a95c4ddbfa0f0cd7e5e08a54aa43 (diff)
downloadlinux-stable-e20fa6609a0076def469aeb799b1c25558e70042.tar.gz
linux-stable-e20fa6609a0076def469aeb799b1c25558e70042.tar.bz2
linux-stable-e20fa6609a0076def469aeb799b1c25558e70042.zip
PCI: Don't check resource_size() in pci_bus_alloc_resource()
Paul reported that after f75b99d5a77d ("PCI: Enforce bus address limits in resource allocation") on a 32-bit kernel (CONFIG_PHYS_ADDR_T_64BIT not set), intel-gtt complained "can't ioremap flush page - no chipset flushing". In addition, other PCI resource allocations, e.g., for bridge windows, failed. This happens because we incorrectly skip bus resources of [mem 0x00000000-0xffffffff] because we think they are of size zero. When resource_size_t is 32 bits wide, resource_size() on [mem 0x00000000-0xffffffff] returns 0 because (r->end - r->start + 1) overflows. Therefore, we can't use "resource_size() == 0" to decide that allocation from this resource will fail. allocate_resource() should fail anyway if it can't satisfy the address constraints, so we should just depend on that. A [mem 0x00000000-0xffffffff] bus resource is obviously not really valid, but we do fall back to it as a default when we don't have information about host bridge apertures. Link: https://bugzilla.kernel.org/show_bug.cgi?id=71611 Fixes: f75b99d5a77d PCI: Enforce bus address limits in resource allocation Reported-and-tested-by: Paul Bolle <pebolle@tiscali.nl> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/pci/bus.c')
-rw-r--r--drivers/pci/bus.c2
1 files changed, 0 insertions, 2 deletions
diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
index 00660cc502c5..38901665c770 100644
--- a/drivers/pci/bus.c
+++ b/drivers/pci/bus.c
@@ -162,8 +162,6 @@ static int pci_bus_alloc_from_region(struct pci_bus *bus, struct resource *res,
avail = *r;
pci_clip_resource_to_region(bus, &avail, region);
- if (!resource_size(&avail))
- continue;
/*
* "min" is typically PCIBIOS_MIN_IO or PCIBIOS_MIN_MEM to