Christoph Hellwig wrote:
>>+#define RETURN_UP(retval) do {up(&sony_sem); return (retval);} while(0)
> 
> 
> Please don't use such obsfucation macros.  Instead use gotos in the
> functions to haev a single exit path that releases the lock.

OK, here's next version of the patch, now without that macro. It also 
adds set_capacity() call so dd can now be used to create CD image. I've 
also found and fixed some other problems (like the handle_abort_timeout 
that I broke in the previous patch).

-- 
Ondrej Zary