audk/DuetPkg/PciBusNoEnumerationDxe
Joseph Shifflett 30a35388d1 DuetPkg: exit pci function loops early if device is not multi-function
When looping through all PCI functions, code should not look for functions
1-7 if function 0 is not present or if function 0 indicates the device is
not multifunction.  Prior to this fix the code would use stale data in a
buffer to determine if a device is multifunction even if function 0 is not
present.  This fixes a code bug and provides very small performance
improvements.

PCI 2.3 Specification states: They [multifunction devices] are also
required to always implement function 0 in the device. Implementing other
functions is optional and may be assigned in any order.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Joseph Shifflett <joseph.shifflett@hpe.com>
Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18575 6f19259b-4bc3-4df7-8a09-765794883524
2015-10-06 20:55:36 +00:00
..
ComponentName.c
PciBus.c
PciBus.h
PciBusNoEnumeration.inf
PciCommand.c
PciCommand.h
PciDeviceSupport.c
PciDeviceSupport.h
PciDriverOverride.c
PciDriverOverride.h
PciEnumerator.c
PciEnumerator.h
PciEnumeratorSupport.c
PciEnumeratorSupport.h
PciIo.c
PciIo.h
PciOptionRomSupport.c
PciOptionRomSupport.h
PciPowerManagement.c
PciPowerManagement.h
PciRomTable.c
PciRomTable.h