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    Subjectproblem with ending requests asynchronously in my block device driver

    Hi,

    I've a block device driver which does the following,

    Inside the request function I do something like this:
    request(fn) {

    while ((req = elv_next_request(q)) != NULL) {
    ....................set up the request;
    spin_unlock_irq(q->queue_lock);
    call the transfer(set_up_req) function;
    spin_lock_irq(q->queue_lock);
    }
    spin_unlock_irq (q->queue_lock);
    /* allow callback to execute as it needs the lock!!! */
    spin_lock_irq (q->queue_lock);


    }
    and the transfer function calls the scsi_execute_asyn(....) with the
    callback function doing the end request. So, the ending of the request is
    done like below:

    callback(fn) {

    spin_lock_irqsave(q->queue_lock, flags);
    if (!end_that_request_first(set_up_req->req, cmpstatus,
    set_up_req->req->nr_sectors)) {
    add_disk_randomness(...);
    end_that_request_last(set_up_req->req,0);
    }
    spin_unlock_irqrestore(q->queue_lock, flags);
    }


    This code works fine with most of the kernel versions, but fails on some
    like , Linux 2.6.18-8.el5-xen

    Please help me to find out where I'm going wrong?

    Thanks in advance for an early reply.
    Anil P.


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