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| author | Andreas Noever <andreas.noever@gmail.com> | 2014-01-23 21:59:27 +0100 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2014-02-11 15:16:09 -0700 |
| commit | c95b0bd6ca3dbb1abf8394c38d26df65d890cb9a (patch) | |
| tree | 0244c2a3b03cf64e3ddb03b09089e46dcd7cf6da /drivers/pci/probe.c | |
| parent | f5fb40700fc9a52944fbe07148c858a5025908b1 (diff) | |
| download | linux-c95b0bd6ca3dbb1abf8394c38d26df65d890cb9a.tar.bz2 | |
PCI: Check for child busses which use more bus numbers than allocated
pci_scan_child_bus can (potentially) return a bus number higher than the
subordinate value of the child bus. Possible reasons are that bus numbers
are reserved for SR-IOV or for CardBus (SR-IOV is done without checks and
the CardBus checks are sketchy at best).
We clamp the returned value to the actual subordinate value and print a
warning if too many bus numbers are reserved.
[bhelgaas: whitespace]
Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/pci/probe.c')
| -rw-r--r-- | drivers/pci/probe.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index e5df03669470..1436288924c3 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -805,10 +805,12 @@ int pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass) } cmax = pci_scan_child_bus(child); - if (cmax > max) - max = cmax; - if (child->busn_res.end > max) - max = child->busn_res.end; + if (cmax > subordinate) + dev_warn(&dev->dev, "bridge has subordinate %02x but max busn %02x\n", + subordinate, cmax); + /* subordinate should equal child->busn_res.end */ + if (subordinate > max) + max = subordinate; } else { /* * We need to assign a number to this bus which we always |