OK, this is the final (?) patch series to resolve the vb2 VBI poll regression
where alevt and mtt fail on drivers using vb2.
These applications call REQBUFS, queue the buffers and then poll() without
calling STREAMON first. They rely on poll() to return POLLERR in that case
and they do the STREAMON at that time. This is correct according to the spec,
but this was never implemented in vb2.
This is fixed together with an other vb2 regression: calling REQBUFS, then
STREAMON, then poll() without doing a QBUF first should return POLLERR as
well according to the spec. This has been fixed as well and the spec has
been clarified that this is only done for capture queues. Output queues in
the same situation will return as well, but with POLLOUT|POLLWRNORM set
instead of POLLERR.
The final patch adds missing documentation to poll() regarding event handling
and improves the documentation regarding stream I/O and output queues.
Regards,
Hans
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