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>At no stage does a packet-mode DMA error turn off drive-level >DMA. This is because some devices seem to perform ordinary >ATA DMA OK, but screw up packet DMA. > >The kernel internally retries the requests when it performs fallback, >so userspace shouldn't see any disruption as the kernel works >out what to do. > >Once the drive has fallen back to single-frame (or PIO mode) for >packet reads, the only way to get it back to a higher level is >a reboot. Doesn that mean that a bad media (typically a scratched CDROM) will cause the drive to revert to PIO until next reboot ? Ben. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | |||||||||
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