From 73f35418a1e921443b5c9f4c58ae70df8b9d1bb6 Mon Sep 17 00:00:00 2001
From: Hans Verkuil <hans.verkuil@cisco.com>
Date: Sun, 10 Mar 2013 13:12:25 -0300
Subject: [PATCH] [media] v4l2-ioctl: check if an ioctl is valid

Just checking if the op exists isn't correct, you should check if the ioctl
is valid (which implies that the op exists as well).
One exception is g_std: if current_norm is non-zero, then the g_std op may be
absent. This sort of weird behavior is one of the reasons why I am trying to
get rid of current_norm.
This patch fixes the case where the g/s_std op is set, but these ioctls are
disabled. This can happen in drivers supporting multiple models, some that
have TV input (and support the STD API) and some that have a sensor (and do
not support the STD API). In the latter case qv4l2 would still show the
Standards combobox.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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