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    SubjectRe: cpqarray broken since 2.5.19
    On Sun, Jul 21 2002, Adam Kropelin wrote:
    > The cpqarray driver seems to have been broken around 2.5.19 with the
    > blk_start_queue/blk_stop_queue changes. As-is, cpqarray deadlocks the entire
    > system when it tries to do partition detection. The bits from the 2.5.19 patch
    > which seem to relate are:
    >
    > > @@ -916,6 +915,7 @@
    > > goto queue_next;
    > >
    > > startio:
    > > + blk_stop_queue(q);
    > > start_io(h);
    > > }
    > >
    > > @@ -1066,8 +1066,8 @@
    > > /*
    > > * See if we can queue up some more IO
    > > */
    > > - do_ida_request(BLK_DEFAULT_QUEUE(MAJOR_NR + h->ctlr));
    > > spin_unlock_irqrestore(IDA_LOCK(h->ctlr), flags);
    > > + blk_start_queue(BLK_DEFAULT_QUEUE(MAJOR_NR + h->ctlr));
    > > }
    > >
    > > /*
    >
    > Simply reverting these changes allows the driver to successfully do
    > partition detect, but it quickly hangs if any significant amount of
    > I/O is attempted. The hang in this case seems to just affect processes
    > trying to do I/O on the array; it is not a whole-system-deadlock.
    >
    > Test machine is SMP ppro.

    Thanks for the report. Could you just kill the spin_lock/unlock in
    blk_stop_queue() in drivers/block/ll_rw_blk.c and see if it works?

    --
    Jens Axboe

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