tree b6c1ac738bd363db83e2ac7ec990474170591450
parent 7cb0aa21a560595ba36ab8230a210471f330288f
author Stephen Warren <swarren@nvidia.com> 1312497882 -0600
committer Mark Brown <broonie@opensource.wolfsonmicro.com> 1312850457 +0900

ASoC: Tegra: tegra_pcm_deallocate_dma_buffer: Don't OOPS

Not all PCM devices have all sub-streams. Specifically, the SPDIF driver
only supports playback and hence has no capture substream. Check whether
a substream exists before dereferencing it, when de-allocating DMA
buffers in tegra_pcm_deallocate_dma_buffer.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: stable@kernel.org