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MdeModulePkg/.../IdeMode: correctly report length of returned data 

For some SCSI commands, notably INQUIRY, it's relatively common for
the device to provide less data than we intended to read, and for
this reason EFI_EXT_SCSI_PASS_THRU_SCSI_REQUEST_PACKET makes
InTransferLength and OutTransferLength read-write.  Make ATAPI
aware of this.

This makes it possible to handle EFI_NOT_READY always, not just
for read as done in r19685.

I've chosen to use a break statement instead of calling
CheckStatusRegister directly; the break statement reaches a
pre-existing call the CheckStatusRegister function.  This
ensures that the assignment to *ByteCount is not missed, and
adds a further sanity check to DRQClear.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Tested-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Feng Tian <feng.tian@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@19737 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Paolo Bonzini 2016-01-25 11:33:37 +00:00 committed by lersek
parent 4e50241273
commit f6a683e01b
1 changed files with 18 additions and 14 deletions
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30
MdeModulePkg/Bus/Ata/AtaAtapiPassThru/IdeMode.c
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@ -1936,7 +1936,7 @@ AtaPacketReadWrite (
IN EFI_PCI_IO_PROTOCOL *PciIo,
IN EFI_IDE_REGISTERS *IdeRegisters,
IN OUT VOID *Buffer,
IN UINT64 ByteCount,
IN OUT UINT32 *ByteCount,
IN BOOLEAN Read,
IN UINT64 Timeout
)
@ -1947,17 +1947,18 @@ AtaPacketReadWrite (
EFI_STATUS Status;
UINT16 *PtrBuffer;
PtrBuffer = Buffer;
RequiredWordCount = *ByteCount >> 1;
//
// No data transfer is premitted.
//
if (ByteCount == 0) {
if (RequiredWordCount == 0) {
return EFI_SUCCESS;
}
PtrBuffer = Buffer;
RequiredWordCount = (UINT32)RShiftU64(ByteCount, 1);
//
// ActuralWordCount means the word count of data really transferred.
// ActualWordCount means the word count of data really transferred.
//
ActualWordCount = 0;
@ -1967,15 +1968,17 @@ AtaPacketReadWrite (
// to see whether indicates device is ready to transfer data.
//
Status = DRQReady2 (PciIo, IdeRegisters, Timeout);
if ((Status == EFI_NOT_READY) && Read) {
//
// Device provided less data than we intended to read -- exit early.
//
return CheckStatusRegister (PciIo, IdeRegisters);
}
if (EFI_ERROR (Status)) {
if (Status == EFI_NOT_READY) {
//
// Device provided less data than we intended to read, or wanted less
// data than we intended to write, but it may still be successful.
//
break;
} else {
return Status;
}
}
//
// get current data transfer size from Cylinder Registers.
@ -2040,6 +2043,7 @@ AtaPacketReadWrite (
return EFI_DEVICE_ERROR;
}
*ByteCount = ActualWordCount << 1;
return Status;
}
@ -2138,7 +2142,7 @@ AtaPacketCommandExecute (
PciIo,
IdeRegisters,
Packet->InDataBuffer,
Packet->InTransferLength,
&Packet->InTransferLength,
TRUE,
Packet->Timeout
);
@ -2147,7 +2151,7 @@ AtaPacketCommandExecute (
PciIo,
IdeRegisters,
Packet->OutDataBuffer,
Packet->OutTransferLength,
&Packet->OutTransferLength,
FALSE,
Packet->Timeout
);