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In case of an async command if updating the submission queue tail doorbell fails then the command will not be picked up by device and no completion response will be created. This scenario has to be handled. Also if we create an AsyncRequest element and insert in the async queue, it will never receive a completion so in the timer routine this element won't be freed, resulting in memory leak. Also in case of blocking calls we should capture the status of updating completion queue head doorbell register and return it to caller of PassThru. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Suman Prakash <suman.p@samsung.com> Reviewed-by: Hao Wu <hao.a.wu@intel.com>