dmaengine: at_xdmac: check for non-empty xfers_list before invoking callback
tx descriptor retrieved from an empty xfers_list may not have valid pointers to the callback functions. Avoid calling dmaengine_desc_get_callback_invoke if xfers_list is empty. Signed-off-by: Raag Jadav <raagjadav@gmail.com> Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com> Signed-off-by: Vinod Koul <vkoul@kernel.org>
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