[quote user="hutchman"]We have a USB hub with a cold plugged Micron SSD flash hanging off the hub and when I load down the USB testing the Micron flash file system ... I see journal errors and believe they are coming from these USB issues.[/quote]
With multiple MSC device connected, I believe the DMA hw bug could only be triggered when there is any new device plugged in - basically during usb enumeration while other DMA transfer is active. So I don't think the test failure you are seeing is related to the hw bug. It either could be DMA driver problem which corrupts USB packets, or not USB related at all.