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    Subjectunfixed regression in 2.6.20-rc6 (since 2.6.19)
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    2.6.19 introduced changes to the UHCI handling of interrupt URBs that
    caused at least some keyspan USB-to-serial converters to fail, because
    the driver code incorrectly assumes that all URBs of the device are
    bulk URBs, while some of them (in the default configuration) are
    actually interrupt URBs. This has been reported via kernel bugzilla as
    bug 7544 on 2006/11/17:

    http://bugzilla.kernel.org/show_bug.cgi?id=7544

    I happen to use such a device, but I didn't have the time to deal with
    this issue until end of december. A fix for this regression has been
    available at least since 2006/12/26. The patch available via bugzilla
    has been reworked by me because of comments from Mr. Kroah-Hartmann,

    http://marc.theaimsgroup.com/?l=linux-kernel&m=116783507105717&w=2

    It has been part of the -mm tree until about three days ago and was
    then dropped by Andrew Morton because Mr Kroah-Hartmann added a
    structurally identical and functionally neutral (or slightly worse)
    rewritten-by-him version of it to something called 'gregkh-2.6',
    presumably, judging from the age of other patches in this particular
    tree (back until 2006/09/19), to never see the light of the day again.

    If this issue is not going to be fixed for some reason, it would at
    least be appropriate to close the bugzilla entry with something like
    WILL_NOT_FIX, because that appears to be the situation at present and
    for an indefinite time to come.
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