Due to needs a tackling the deficiency of the AP API, is necessary to ensure
that in non-blocking mode
previous AP executed command is finished before start new one.
To remedy above:
1) execute AcquireSpinLock instead AcquireSpinLockOrFail - this will ensure
time "window" to eliminate potential
race condition beetwen BSP and AP spinLock release in non-blocking mode.
This also will eliminate possibility to start executing new AP function
before last is finished.
2) remove returns EFI_STATUS - EFI_NOT_READY - in new scenario returned
status is not necessary to caller.
Signed-off-by: Damian Nikodem <damian.niko...@intel.com>
Cc: Eric Dong <eric.d...@intel.com>
Cc: Ray Ni <ray...@intel.com>
Cc: Benjamin You <benjamin....@intel.com>
Cc: Laszlo Ersek <ler...@redhat.com>
Cc: Krzysztof Rusocki <krzysztof.ruso...@intel.com>
diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c
b/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c
index d8d2b6f444..0685637c2b 100644
--- a/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c
+++ b/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c
@@ -1235,14 +1235,9 @@ InternalSmmStartupThisAp (
return EFI_INVALID_PARAMETER;
}
- if (Token == NULL) {
- AcquireSpinLock (mSmmMpSyncData->CpuData[CpuIndex].Busy);
- } else {
- if (!AcquireSpinLockOrFail (mSmmMpSyncData->CpuData[CpuIndex].Busy)) {
- DEBUG((DEBUG_ERROR, "Can't acquire mSmmMpSyncData->CpuData[%d].Busy\n",
CpuIndex));
- return EFI_NOT_READY;
- }
+ AcquireSpinLock (mSmmMpSyncData->CpuData[CpuIndex].Busy);
+ if (Token != NULL) {
*Token = (MM_COMPLETION) CreateToken ();
}
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