[Bug 790940] v4l2src not falling back to another io-mode if driver does not support dmabuf

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=790940

--- Comment #6 from Florent Thiéry <florent.thiery at ubicast.eu> ---
Indeed, just found out.

So in the end my the ioctl returns ENOTTY instead of -ENOTTY. Shouldn't
gst_v4l2_object_is_dmabuf_supported also return FALSE if errno == ENOTTY as
well ?

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