iokit/Kernel/IOHibernateIO.cpp

1683     vars->previewBuffer = OSDynamicCast(IOMemoryDescriptor, obj);
1684     if (obj && !vars->previewBuffer)
1688     if (vars->previewBuffer && (kIOReturnSuccess != vars->previewBuffer->prepare()))
1690 	vars->previewBuffer->release();
1691 	vars->previewBuffer = 0;
1695         && vars->previewBuffer
1796     if (vars->previewBuffer)
1798         vars->previewBuffer->release();
1799         vars->previewBuffer = 0;
2260         if (vars->previewBuffer)
2266                 phys64 = vars->previewBuffer->getPhysicalSegment(count, &segLen, kIOMemoryMapperNone);
2281             src = (uint8_t *) vars->previewBuffer->getPhysicalSegment(0, NULL, _kIOMemorySourceSegment);
2285             count = vars->previewBuffer->getLength();
2292                 phys64 = vars->previewBuffer->getPhysicalSegment(page, NULL, kIOMemoryMapperNone);
2343         if (vars->previewBuffer) for (count = 0;
2344                                         (phys64 = vars->previewBuffer->getPhysicalSegment(count, &segLen, kIOMemoryMapperNone));