Am Montag, 15. Januar 2007 16:34 schrieb David Brownell:
> On Monday 15 January 2007 2:05 am, Oliver Neukum wrote:
> > // as long as data wanted
> > down_interruptible(&dev->sem_wantdata);
> >
> > You cannot use semaphores in interrupt context. Please read the kernel
> > documentation about spinlocks and locking in general.
>
> ISTR that you can up() a semaphore in such contexts, but not down() it.
Yes, even down_trylock() would work, but down_interruptible() is deadly.
Regards
Oliver
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