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    SubjectRe: usb-serial ipaq kernel problem
    On Mon, 29 May 2006 12:01:02 -0300
    "Luiz Fernando N. Capitulino" <lcapitulino@mandriva.com.br> wrote:

    |
    | Hi Pete,
    |
    | On Fri, 26 May 2006 13:34:10 -0700
    | Pete Zaitcev <zaitcev@redhat.com> wrote:
    |
    | | On Fri, 26 May 2006 20:22:17 +0200, Frank Gevaerts <frank.gevaerts@fks.be> wrote:
    | |
    | | > usb 1-4.5.7: USB disconnect, address 79
    | | > ------------[ cut here ]------------
    | | > kernel BUG at kernel/workqueue.c:110!
    | |
    | | Please let me know if this helps:
    | |
    | | --- linux-2.6.17-rc2/drivers/usb/serial/usb-serial.c 2006-04-23 21:06:18.000000000 -0700
    | | +++ linux-2.6.17-rc2-lem/drivers/usb/serial/usb-serial.c 2006-05-22 21:23:29.000000000 -0700
    | | @@ -162,6 +162,8 @@ static void destroy_serial(struct kref *
    | | }
    | | }
    | |
    | | + flush_scheduled_work(); /* port->work */
    | | +
    | | usb_put_dev(serial->dev);
    | |
    | | /* free up any memory that we allocated */
    |
    | IIUC, the problem occurred before the call to destroy_serial(),
    | otherwise it should be in the backtrace.
    |
    | It seems that 'port->work' is becoming NULL when the device is
    | disconnected, but the ipaq_write_bulk_callback() is executing after
    | that.

    Err, I meant 'port->work->entry' is empty, of course.

    --
    Luiz Fernando N. Capitulino
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