Vinod Koul 757d12e584 dmaengine: ensure dmaengine helpers check valid callback ...

dmaengine has various device callbacks and exposes helper
functions to invoke these. These helpers should check if channel,
device and callback is valid or not before invoking them.

Reported-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

2016-04-12 21:07:06 +05:30

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