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fix: Only register root bridges with actual devices, not empty ones. (#2142) 

Registering logical root bridges with no devices can cause unexpected
behavior for platforms that use _PCI_ENUM_BUS_SCAN_TYPE = "range", since
all empty buses in the range will be compared against the resource
allocation table entries.

Signed-off-by: Bejean Mosher <bejean.mosher@intel.com>
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bejeanmo 2024-02-16 12:34:49 -05:00 committed by GitHub
parent 557d4228f9
commit 9c527d99c8
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1 changed files with 5 additions and 2 deletions
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7
BootloaderCorePkg/Library/PciEnumerationLib/PciEnumerationLib.c
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@ -1742,8 +1742,11 @@ PciScanRootBridges (
Root->BusNumberRanges.BusLimit = SubBusNumber;
Root->Address |= BIT31;
InsertPciDevice (Bridge, Root);
Count++;
// Only add Root Bridges with actual devices, not empty ones.
if (Root->ChildList.ForwardLink != &Root->ChildList) {
InsertPciDevice (Bridge, Root);
Count++;
}
if (EnumPolicy->BusScanType != BusScanTypeList) {
Index = SubBusNumber;