linux-kernel - Re: [RFC 2/6] block: add flag for add

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Message-ID: <YPVNRLgBtUOb1d17@infradead.org>
Date:   Mon, 19 Jul 2021 11:00:36 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     Luis Chamberlain <mcgrof@...nel.org>
Cc:     axboe@...nel.dk, hare@...e.de, bvanassche@....org,
        ming.lei@...hat.com, hch@...radead.org, jack@...e.cz,
        osandov@...com, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC 2/6] block: add flag for add_disk() completion notation

>  {
>  	might_sleep();
>  
> +	if (!blk_disk_registered(disk))
> +		return;
> +

Can't say I like this all that much.  Drivers should keep some
basic sanity for their unregister path, and while blk_disk_registered
can be useful, it's uses should be kept at a minimum.