Possible sound driver bug...?

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I'm messing about with the relatively new mmap()'able DMA sound buffers,
with linux-2.0.31-pre2.

Basically, I have opened /dev/dsp O_WRONLY. However, when I try to mmap
the thing with PROT_WRITE only, the mmap call fails. If I open /dev/dsp
with O_RDWR, the mmap call will succeed.

Sounds like a simple one to fix to me, I haven't had the time to have a
detailed poke around yet...

Cheers,
Chris

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