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    SubjectRe: 2.6.13-mm1: hangs during boot ...
    On Sat, 2005-09-03 at 23:51 +1000, Peter Williams wrote:
    > > Are you seeing this "Device not ready" message appear over and over, or
    > > just the once?
    > Just the once.

    OK, I finally have a theory about this. It's the everything goes via
    bios code. Previously there were several levels at which commands could
    exit the SCSI stack; now we make everything go via bios, so they all
    come out at the top.

    get_capabilities() in sr.c is sending a TEST_UNIT_READY which will get
    NOT_READY back. Previously this was completing before it got to
    scsi_io_completion(); now it doesn't. There must be quite a few cases
    like this. The best fix is probably to use and respect REQ_QUIET for
    internally generated commands.


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