linux-kernel - Re: [PATCH 05/10] nvme: add error handling support for add

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Message-ID: <YSSNIaYpUhrkvC+J@infradead.org>
Date:   Tue, 24 Aug 2021 07:09:37 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     Luis Chamberlain <mcgrof@...nel.org>
Cc:     axboe@...nel.dk, martin.petersen@...cle.com, jejb@...ux.ibm.com,
        kbusch@...nel.org, sagi@...mberg.me, adrian.hunter@...el.com,
        beanhuo@...ron.com, ulf.hansson@...aro.org, avri.altman@....com,
        swboyd@...omium.org, agk@...hat.com, snitzer@...hat.com,
        josef@...icpanda.com, hch@...radead.org, hare@...e.de,
        bvanassche@....org, ming.lei@...hat.com,
        linux-scsi@...r.kernel.org, linux-nvme@...ts.infradead.org,
        linux-mmc@...r.kernel.org, dm-devel@...hat.com,
        nbd@...er.debian.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 05/10] nvme: add error handling support for add_disk()

On Mon, Aug 23, 2021 at 01:29:25PM -0700, Luis Chamberlain wrote:
> +	rc = device_add_disk(ctrl->device, ns->disk, nvme_ns_id_attr_groups);
> +	if (rc)
> +		goto out_cleanup_ns_from_list;
> +

Nit: no real need for the rc variable here as we never use the actual
value.

>  	if (!nvme_ns_head_multipath(ns->head))
>  		nvme_add_ns_cdev(ns);
>  
> @@ -3785,6 +3789,10 @@ static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid,
>  
>  	return;
>  
> + out_cleanup_ns_from_list:
> +	down_write(&ctrl->namespaces_rwsem);
> +	list_del_init(&ns->list);
> +	up_write(&ctrl->namespaces_rwsem);

This also needs to do a nvme_put_ctrl.