linux-kernel - Re: [PATCH] null_blk: oops when initializing without lightnvm

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Date:	Thu, 11 Feb 2016 08:56:28 -0700
From:	Jens Axboe <axboe@...nel.dk>
To:	Matias Bjørling <m@...rling.me>,
	linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
	axboe@...com
Subject: Re: [PATCH] null_blk: oops when initializing without lightnvm

On 02/11/2016 06:49 AM, Matias Bjørling wrote:
> If the LightNVM subsystem is not compiled into the kernel, and the
> null_blk device driver requests lightnvm to be initialized. The call to
> nvm_register fails and the null_add_dev function cleans up the
> initialization. However, at this point the null block device has
> already been added to the nullb_list and thus a second cleanup will
> occur when the function has returned, that leads to a double call to
> blk_cleanup_queue.

Deferring the add seems fine, applied for 4.5.

-- 
Jens Axboe