sleep_on problems

[Heap Ho Tan <heaphotan@xxxxxxxxx>]

Hi, 
I have the following piece of code, interestingly any 
line of code after sleep_on will not get executed.
Also what is the difference between
interruptible_sleep_on and sleep_on, when do you use
one versus other? Also for the different types of
spin_lock, 
when do you decide you need one over the other?

Thanks
Heap-Ho

Note in this case if sleep_on suspends the current
process, there will be a deadlock situation, is there
anyway out of this??

asmlinkage int myeventwait(int eventID)
{
  struct list_head *tmp;
  struct eventDest *eventtmp;
  list_for_each(tmp, &event_head){
    eventtmp = list_entry(tmp, struct eventDest,
event_list);
    spin_lock_irq(&eventtmp->eventLock);
    if(eventtmp->eventID == eventID){
      //printk("In eventwait and evenID: %d\n",
eventtmp->eventID);
      eventtmp->nb_process=eventtmp->nb_process+1;
      //printk("No of processes waiting: %d\n",
eventtmp->nb_process);
      sleep_on(&(eventtmp->queue));
      spin_unlock_irq(&eventtmp->eventLock);
      return 1;
    }
    spin_unlock_irq(&eventtmp->eventLock);
  }
  return -1;
}

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