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| author | Bjorn Helgaas <bhelgaas@google.com> | 2013-09-25 01:14:57 +0400 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2013-09-26 01:43:58 +0400 |
| commit | 77a0dfcd8a4d9a93a21c8be56eaeb65cd69b351d (patch) | |
| tree | 78fc61e77d3976560185ac61c7944755a7009502 /include/linux/pci.h | |
| parent | 2ba29e270e977b213a7d58ae1152c23a1c3074a3 (diff) | |
| download | linux-77a0dfcd8a4d9a93a21c8be56eaeb65cd69b351d.tar.xz | |
PCI: Document reason for using pci_is_root_bus()
Some code assumes "bus->self == NULL" means the bus is a root bus. This
adds a comment explaining why this is incorrect ("virtual" buses added for
SR-IOV have "bus->self == NULL" but are not root buses).
No functional change.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'include/linux/pci.h')
| -rw-r--r-- | include/linux/pci.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/pci.h b/include/linux/pci.h index 197e2d21f2cb..d3a888ae4b2e 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -470,6 +470,10 @@ struct pci_bus { /* * Returns true if the pci bus is root (behind host-pci bridge), * false otherwise + * + * Some code assumes that "bus->self == NULL" means that bus is a root bus. + * This is incorrect because "virtual" buses added for SR-IOV (via + * virtfn_add_bus()) have "bus->self == NULL" but are not root buses. */ static inline bool pci_is_root_bus(struct pci_bus *pbus) { |