linux-kernel - Re: [PATCH] block: mq-deadline: check if elevator is attached to queue in dd_finish

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Message-ID: <23f31e20-e58f-44e9-b81f-18811ce5c19c@acm.org>
Date: Tue, 17 Jun 2025 17:19:22 -0700
From: Bart Van Assche <bvanassche@....org>
To: Elijah Wright <git@...jahs.space>
Cc: axboe@...nel.dk, linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] block: mq-deadline: check if elevator is attached to
 queue in dd_finish_request

On 6/17/25 3:52 PM, Elijah Wright wrote:
> I see. would it be possible to detach the elevator from the queue in 
> elevator_exit instead?

elevator_switch() is called with the request queue frozen.
q_usage_counter is dropped after the blk_mq_finish_request() call
returned. So what you described in your patch description can't happen.

Bart.