dsp mmap change

[Kostik Belousov]

On Fri, May 06, 2011 at 11:55:00AM +0300, Andriy Gapon wrote:
> 
> I would like to ask for a review and/or testing of the following patch:
> http://people.freebsd.org/~avg/dev_dsp_mmap.diff
> 
> It's supposed to fix an issue described here:
> http://lists.freebsd.org/pipermail/freebsd-multimedia/2011-February/011691.html
> 
> In short, the following pseudo-code should do the right thing:
> fd = open(/dev/dsp, O_RDWR);
> mmap(PROT_READ, fd);
> mmap(PROT_WRITE, fd);
> 
> Thank you!

I think that you have to call PCM_GIANT_LEAVE() when returning
EINVAL on the vm_pager_alloc() failure.

Your patch hardcodes an assumption that sndbufs are always
contiguous. I was unable to convince myself that this is true.
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