Hi,
I'm trying to implement a timer, which on each timer interrupt wakes up
every process that got blocked by a read call. 
My problem is the following: if I'm insmod'ing the module (I've attached the
file) the execution gets
blocked on the wake_up_interruptible(&timer_queue); call. If I'm
uncommenting this line everything
goes smooth and the timer counts without problems. Does somebody have a
hint? Some ideas?
Regards
Juergen

void timerEvent(unsigned long arg)
{
    tick_count++;
   wake_up_interruptible(&timer_queue);
    timer.expires= jiffies + timer_delay;
    add_timer(&timer);
}

int __init init_timer_module(void)
{
    /* Create the proc entry and make it readable and writeable by all -
0666 */
    timer_file = create_proc_entry("timer", 0666, NULL);
    if (timer_file == NULL) {
        return -ENOMEM;
    }

    /* Set timer_file fields */
    timer_file->read_proc = &proc_read_timer;
    timer_file->write_proc = &proc_write_timer;
    timer_file->owner = THIS_MODULE;

    SET_MODULE_OWNER(&timer_fops);

    /* register /dev/tick */
    register_chrdev(TICK_MAJOR, "tick", &timer_fops);

    init_timer(&timer);
    timer.expires= jiffies + timer_delay;
    timer.function=timerEvent;
    timer.data=42;
    add_timer(&timer);

    /* everything initialized */
    printk(KERN_INFO "%s %s initialized\n", MODULE_NAME, MODULE_VERSION);
    return 0;
}

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