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Date:   Tue, 7 Sep 2021 09:37:05 +0800
From:   Ming Lei <ming.lei@redhat.com>
To:     Luis Chamberlain <mcgrof@kernel.org>
Cc:     axboe@kernel.dk, martin.petersen@oracle.com, jejb@linux.ibm.com,
        kbusch@kernel.org, sagi@grimberg.me, adrian.hunter@intel.com,
        beanhuo@micron.com, ulf.hansson@linaro.org, avri.altman@wdc.com,
        swboyd@chromium.org, agk@redhat.com, snitzer@redhat.com,
        josef@toxicpanda.com, hch@infradead.org, hare@suse.de,
        bvanassche@acm.org, linux-scsi@vger.kernel.org,
        linux-nvme@lists.infradead.org, linux-mmc@vger.kernel.org,
        dm-devel@redhat.com, nbd@other.debian.org,
        linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
        Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH v3 2/8] scsi/sr: add error handling support for add_disk()
Message-ID: <YTbCQdieHG07Bz8W@T590>
References: <20210830212538.148729-1-mcgrof@kernel.org>
 <20210830212538.148729-3-mcgrof@kernel.org>
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On Mon, Aug 30, 2021 at 02:25:32PM -0700, Luis Chamberlain wrote:
> We never checked for errors on add_disk() as this function
> returned void. Now that this is fixed, use the shiny new
> error handling.
> 
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
> ---
>  drivers/scsi/sr.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
> index 2942a4ec9bdd..72fd21844367 100644
> --- a/drivers/scsi/sr.c
> +++ b/drivers/scsi/sr.c
> @@ -779,7 +779,10 @@ static int sr_probe(struct device *dev)
>  	dev_set_drvdata(dev, cd);
>  	disk->flags |= GENHD_FL_REMOVABLE;
>  	sr_revalidate_disk(cd);
> -	device_add_disk(&sdev->sdev_gendev, disk, NULL);
> +
> +	error = device_add_disk(&sdev->sdev_gendev, disk, NULL);
> +	if (error)
> +		goto fail_minor;

You don't undo register_cdrom(), maybe you can use kref_put(&cd->kref, sr_kref_release);
to simplify the error handling.


Thanks,
Ming