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MdeModulePkg/PciBusDxe: Improve the flow of testing support attributes #1

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MdeModulePkg/PciBusDxe: Improve the flow of testing support attributes #1

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7 changes: 5 additions & 2 deletions MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumeratorSupport.c
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Original file line number Diff line number Diff line change
Expand Up @@ -933,6 +933,7 @@ PciTestSupportedAttribute (
)
{
EFI_TPL OldTpl;
UINT16 CommandValue;

//
// Preserve the original value
Expand All @@ -943,10 +944,12 @@ PciTestSupportedAttribute (
// Raise TPL to high level to disable timer interrupt while the BAR is probed
//
OldTpl = gBS->RaiseTPL (TPL_HIGH_LEVEL);
CommandValue = *Command | *OldCommand;

PCI_SET_COMMAND_REGISTER (PciIoDevice, *Command);
PCI_READ_COMMAND_REGISTER (PciIoDevice, Command);
PCI_SET_COMMAND_REGISTER (PciIoDevice, CommandValue);
PCI_READ_COMMAND_REGISTER (PciIoDevice, &CommandValue);

*Command = *Command & CommandValue;
//
// Write back the original value
//
Expand Down