[Bug 78297] Radeon uvd makes VDPAU clients to crash at vlVdpDecoderCreate with 1080p videos

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78297

--- Comment #11 from Christian König <deathsimple at vodafone.de> ---
(In reply to comment #10)
> (In reply to comment #9)
> > That's the problem:
> > 
> > [    1.714537] [drm] Detected VRAM RAM=1024M, BAR=128M
> > 
> > Your PCI BAR is smaller than usually, for a REDWOOD 256M are normal. Going
> > to hack up a patch for this.
> 
> Nice to hear!
> But in these cases where there's not enough memory, shouldn't the vdpau
> driver to fail returning an error (making the client to fallback to software
> rendering), instead of crashing?

It's not the VDPAU driver that's failing here, it's the kernel.

When the kernel can't place a buffer into visible VRAM the buffer should be
moved into GART instead for CPU access. But instead we just return a SIGBUS to
the application effectively crashing it.

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