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    SubjectRe: [linux-usb-devel] 2.6.0-test4 - PL2303 OOPS - see also 2.4.22: OOPS on disconnect PL2303 adapter
    Date
    On Wednesday 03 September 2003 00:43, Greg KH wrote:
    > On Tue, Sep 02, 2003 at 01:39:08AM +0800, Michael Frank wrote:
    > > PL2303 is used to connect the serial console on a classic serial port
    > > of a test machine. HW nandshaking is used
    > > The test machine reboots once a minute and dumps lots of messages
    > >
    > > Frequently:
    > > - driver hangs
    > > - userspace (cu) can't be stopped
    > > - pl2303 and/or usbserial can't be unloaded
    > > - USB interrupts stop
    > > - problems result in requiring a reboot.
    >
    > Hm, it looks like you physically removed the device, is that correct?
    > Or were you just unloading the pl2303 and other USB drivers and then
    > reloading them?
    >
    > What exactly were you doing in this log?
    >
    > Oh, and can you send a copy of /proc/bus/usb/devices with your pl2303
    > device plugged in?
    >

    Whenever it stops working I follow this sequence, which you can match
    to the logs.

    1) Exit cu by ~.
    - if this does not work
    try \r~.
    - if this does not work
    Send SIGHUP, (which so far always worked)

    2) Start cu again
    - if it prints leftover characters
    exit cu again by ~. and continue from step 2)

    3) If it still not works and hangs again
    - for a few tries
    unplug PL2303, wait a second replug and goto step 2)


    4) If it still does not work
    - Remove PL2303, unload and reload usb (all) and
    plug PL2303 again
    - If module unloading fails, or interrupts died
    (no response to plugging) > reboot



    Regards
    Michael



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