linux-wandboard

ENGR00174809 hdmi audio oops in hdmi_dma_mmap_copy

Runtime dma_area may be invalid after trigger stop command.
This will cause an oops in hdmi_dma_mmap_copy.  To fix this,
disable mmap copying with trigger stop command and also check
the runtime->dma_area before doing hdmi_dma_mmap_copy.

Signed-off-by: Alan Tull <r80115@freescale.com>