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Commit 6228d186 authored by Nicolas Dufresne's avatar Nicolas Dufresne
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v4l2: Workaround libv4l2 RW emulation bug

When libv4l2 emulates RW mode on top of MMAP devices, the queues are
only initialized on first read. The problem is that poll() will fail
if called before the queues are initialized and streaming. Workaround
this by doing a zero size read when pool is started in that IO mode.

https://bugzilla.gnome.org/show_bug.cgi?id=740633
parent 6e40449c
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