iokit/Kernel/IODMACommand.cpp

242     if (mem == fMemory)
252     if (fMemory) {
278 	fMemory = mem;
298     if (fMemory) {
301 	fMemory->dmaCommandOperation(kIOMDSetDMAInactive, this, 0);
302 	fMemory->release();
303 	fMemory = 0;
312     return fMemory;
546 		    IOMemoryDescriptor *poMD = const_cast<IOMemoryDescriptor *>(fMemory);
695 	IOMemoryDescriptor *poMD = const_cast<IOMemoryDescriptor *>(fMemory);
766 		if (!md) md = fMemory;
821 	    IOMemoryDescriptor *poMD = const_cast<IOMemoryDescriptor *>(fMemory);
1052 			addr64_t phys = const_cast<IOMemoryDescriptor *>(fMemory)->getPhysicalSegment(checkOffset + offset, &segLen, kIOMemoryMapperNone);
1067 		    internalState->fCopyMD ? internalState->fCopyMD : fMemory;