S_CTRL must be called twice to set volatile controls

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Hi,

After testing my v4l2-flash helpers patch [1] with the recent patches
for v4l2-ctrl.c ([2] and [3]) s_ctrl op isn't called despite setting
the value that should be aligned to the other step than default one.

This happens for V4L2_CID_FLASH_TORCH_INTENSITY control with
V4L2_CTRL_FLAG_VOLATILE flag.

The situation improves after setting V4L2_CTRL_FLAG_EXECUTE_ON_WRITE
flag for the control. Is this flag required now for volatile controls
to be writable?

[1] http://www.spinics.net/lists/linux-media/msg89004.html
[2] 45f014c5 [media] media/v4l2-ctrls: Always execute EXECUTE_ON_WRITE ctrls
[3] b08d8d26 [media] media/v4l2-ctrls: volatiles should not generate CH_VALUE
--
Best Regards,
Jacek Anaszewski
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