Re: Interrupt/Sleep deadlock

[Rusty Russell]

In message <[e-mail]> you write:
> Heh.. I needed to figure this out about 6 months ago.  Here's the "right
> answer"
> 
> Before sending the command to the board, call
> set_current_state(TASK_UNINTERRUPTIBLE).

*Ahem*

  Wait Queues
  ...
    Queuing

    Placing yourself in the waitqueue is fairly complex, because you
    must put yourself in the queue before checking the condition.
    There is a macro to do this: wait_event_interruptible()
    include/linux/sched.h.  The first argument is the wait queue head,
    and the second is an expression which is evaluated; the macro
    returns 0 when this expression is true, or -ERESTARTSYS if a
    signal is received.

    The wait_event() version ignores signals.

Hope that helps,
Rusty.
--
Hacking time.