Re: [PATCH v5] blk-mq: Avoid that a completion can be ignored for BLK_EH_RESET_TIMER

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The blk-mq timeout handling code ignores completions that occur after blk_mq_check_expired() has been called and before blk_mq_rq_timed_out() has reset rq->aborted_gstate. If a block driver timeout handler always returns BLK_EH_RESET_TIMER then the result will be that the request never terminates.

Under this situation:

IMO, if this request has been handled by driver's irq handler, and if driver's .timeout still returns BLK_EH_RESET_TIMER, it is driver's bug, and the correct return value should be BLK_EH_HANDLED.

Is it possible to guarantee this efficiently if the irq handler can run concurrently with the timeout handler?