John wrote:

>drivers/char/mwave/mwavedd.c:331:2: warning: #warning "Sleeping on spinlock"
>  
>
Interesting locking strategy:
A spinlock is placed on the stack and then 
spin_lock_irqsave(&local_lock, flags).

Attached is a patch that removes that. Untested due to lack of hardware. 
Anyone around such hardware (IBM Thinkpad?)
--
    Manfred