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MdeModulePkg/NvmExpressDxe: fix error status override

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Commit f6b139b added return status handling to PciIo->Mem.Write.
However, the second status handling will override EFI_DEVICE_ERROR
returned in this branch:

  //
  // Check the NVMe cmd execution result
  //
  if (Status != EFI_TIMEOUT) {
    if ((Cq->Sct == 0) && (Cq->Sc == 0)) {
      Status = EFI_SUCCESS;
    } else {
      Status = EFI_DEVICE_ERROR;
               ^^^^^^^^^^^^^^^^

Since PciIo->Mem.Write will probably return SUCCESS, it causes
NvmExpressPassThru to return SUCCESS even when DEVICE_ERROR occurs.
Callers of NvmExpressPassThru will then continue executing which may
cause further unexpected results, e.g. DiscoverAllNamespaces couldn't
break out the loop.

So we save previous status before calling PciIo->Mem.Write and restore
the previous one if it already contains error.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Heyi Guo <heyi.guo@linaro.org>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Hao Wu <hao.a.wu@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
This commit is contained in:
Heyi Guo 2017-12-04 10:27:54 +08:00 committed by Hao Wu
parent c1c72a46b9
commit 9a77210b43
1 changed files with 5 additions and 0 deletions
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5
MdeModulePkg/Bus/Pci/NvmExpressDxe/NvmExpressPassthru.c
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@ -453,6 +453,7 @@ NvmExpressPassThru (
{
NVME_CONTROLLER_PRIVATE_DATA *Private;
EFI_STATUS Status;
EFI_STATUS PreviousStatus;
EFI_PCI_IO_PROTOCOL *PciIo;
NVME_SQ *Sq;
NVME_CQ *Cq;
@ -831,6 +832,7 @@ NvmExpressPassThru (
}
Data = ReadUnaligned32 ((UINT32*)&Private->CqHdbl[QueueId]);
PreviousStatus = Status;
Status = PciIo->Mem.Write (
PciIo,
EfiPciIoWidthUint32,
@ -839,6 +841,9 @@ NvmExpressPassThru (
1,
&Data
);
// The return status of PciIo->Mem.Write should not override
// previous status if previous status contains error.
Status = EFI_ERROR (PreviousStatus) ? PreviousStatus : Status;
//
// For now, the code does not support the non-blocking feature for admin queue.