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PCI: Document reason for using pci_is_root_bus()

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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>
This commit is contained in:
Bjorn Helgaas 2013-09-24 15:14:57 -06:00
parent 2ba29e270e
commit 77a0dfcd8a
1 changed files with 4 additions and 0 deletions
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4
include/linux/pci.h
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@ -470,6 +470,10 @@ struct pci_bus {
/* /*
* Returns true if the pci bus is root (behind host-pci bridge), * Returns true if the pci bus is root (behind host-pci bridge),
* false otherwise * 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) static inline bool pci_is_root_bus(struct pci_bus *pbus)
{ {