This may or may not be helpful. I've noticed similar errors with my SATA disks, and they went away when I powered down, switched off the power supply, and then purged the remaining current from the system by hitting the power button. If I power down or restart the machine without going through this process, I get DMA errors. I don't know why this is, and I'm not entirely sure my power supply isn't wrecked. I have an inkling that on the controller there may be some registers that need to be cleared, but they are staying latched on a power cycle, resulting in I/O behavior not expected by the driver. This could explain why a full power purge would correct the problem. But this is just a theory by someone only informally educated on electronics, I could be way off.
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perl -e "eval pack(q{H*}, join q{},qw{7072696e74207061636b28717b482a7d2c717b34393 23036333631366532303666366536633739323036313733373 33735366436353230373936663735323036353738373036353 63337343635363432303734363836393733323037343666323 03632363532303631323036633639373437343663363532303 66436663732363532303635366537343635373237343631363 93665363936653637326530617d293b})"
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