Re: [PATCH 0/3] vb2: fix VBI/poll regression

[Mauro Carvalho Chehab <mchehab@osg.samsung.com>]

Em Sat, 20 Sep 2014 10:56:12 +0200
Hans Verkuil <hverkuil@xs4all.nl> escreveu:

> 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.

Didn't test yet, but the patch series look ok on my eyes.

I'll do some tests today.

Regards,
Mauro