dmaengine: rcar-dmac: implement device_synchronize()
Implement the device_synchronize() callback which wait until a dma channel is stopped to provide a synchronization point. This protects the driver from multiple race conditions when terminating and freeing resources. E.g. the completion callback still running after device_terminate_all() has completed. Signed-off-by:Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> Signed-off-by:
Vinod Koul <vinod.koul@intel.com>
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