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    Subjectfloppy.c soft lockup
    Changes in floppy.c from 2.6.17 and 2.6.18 have broken an application I have. I have tracked 
    it down to a single line of code. When the following patch is applied to the version in 2.6.18
    my application works.

    --- linux-2.6.18/drivers/block/floppy.c 2006-09-19 23:42:06.000000000 -0400
    +++ linux-2.6.18-crt/drivers/block/floppy.c 2007-05-29 09:12:20.000000000 -0400
    @@ -893,7 +893,6 @@
    remove_wait_queue(&fdc_wait, &wait);

    - flush_scheduled_work();
    command_status = FD_COMMAND_NONE;

    I don't claim to understand the changes from 2.6.17 to 2.6.18 except for the devfs removal.
    All I can say is this one line of code kills the application. I have tried to write a short pgm
    that shows my problem but everything else I write seems to work. The application only runs
    on SMP machines and uses process and irq affinities with real-time scheduling. When I turn
    off process and irq affinities the application runs.
    I have tried kernels up through with the same results. All kernels from 2.6.18 up
    require that I remove this one line of code or my application does not work?


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      Last update: 2007-05-29 19:43    [W:0.020 / U:19.524 seconds]
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